Iscsi benchmark. All KVM machines reside on that Storage.

Iscsi benchmark Dec 20, 2021 · Comparing performance of NVMe/TCP with iSCSI How does NVMe/TCP stack up against iSCSI in terms of performance? Lightbits conducted a side-by-side comparison of the two technologies to arrive at benchmark results. What can I 3. These results clearly show iSCSI to be an ideal fit for very high performance storage networking solutions. Our FreeNAS is connected to an UPS, but still iSCSI has VAAI support on FreeNAS. Jan 14, 2019 · iSCSI Best Practices: Solutions to Real-World Deployment Challenges Lee Levenson January 14, 2019 4,028 views This best practice document was created to share my production experience in architecting, implementing, and managing many ONTAP 7-Mode HA pairs and over 30 ONTAP SAN clusters. TL;DR I was able to get almost 4GB/s throughput to a single VMware VM using Mellanox ConnectX-5 cards and TrueNAS Scale 23. These adjustments allow my Unraid and iSCSI configuration to deliver a robust and high-performance block storage solution tailored to my workloads. block-level access for data sharing. Oct 25, 2023 · iSCSI shines in block-based workloads, providing optimal performance for storage area networks (SANs), virtualization, and database applications, particularly in Windows and VMware environments. Jun 1, 2023 · Both NFS and iSCSI support Jumbo frames to improve network performance. ISCSI Performance Test The iSCSI protocol is a licensed service on the storage system that enables you to transfer block data to hosts using the SCSI protocol over TCP/IP. So, you want to use a storage test tool to run a workload against an iSCSI store. The protocols Fibre Channel, Hardware iSCSI, Software iSCSI, and NFS are tested using virtual machines on an ESX 4. We added a Fibre Channel and Ethernet switch with redundant inter switch links (ISLs) between the two pairs of switches, simulating how systems are typically deployed in Sep 6, 2024 · Truenas core iscsi performance Halcy0n September 6, 2024, 9:08pm 2 could you describe exactly what your configuration is? from reading your post it seems like you have proxmox installed on top of truenas and have passed the controller through? or is truenas on top of proxmox? or are they on separate machines? George: nteresting thing though, while testing I decided to virtualize win11 to see Sep 11, 2024 · 2. 7% improvement). org, I see much higher numbers. Jun 14, 2011 · I recently encountered some performance issues using iSCSI. Congested Performance To characterize how Fibre Channel and iSCSI perform with all-flash storage arrays supporting enterprise workloads, ESG modified the test bench to create congestion on each fabric, as shown in Figure 6. But i only get a throughput of about 17MB/sec from within a virtual machine Oct 18, 2022 · Network share speed (attempt 1) I created a benchmarking dataset on my storage pool in TrueNAS. iSCSI usually has it's own dedicated network for optimal performance and there can be a lot of different areas for tuning. NFS vs iSCSI, fight! (your thoughts on performance) It was recently postulated to me that I should explore using NFS instead of iSCSI for space for my VM disks as it would result in better performance. Nov 16, 2020 · Hello everyone, I would like your opinion on iscsi. Additionally, it helps multipathing for better redundancy and overall performance. Anyone seen (or run) a benchmark comparing performance of qts vs quts for iscsi? Using it for vmware specifically here, but I'd be interested in any testing on it. e. Dec 28, 2009 · Well, iSCSI is a type of storage. In this paper, we experimentally compare NFS and iSCSI performance for environments with no data sharing across machines. Similarly comparing 40G iSCSI vs 16G Fibre Channel is nonsense at all. A purpose-built, performance-optimized iSCSI storage, like Blockbridge, operates in the microsecond range. Oct 3, 2023 · Now, what we’re going to do is measure and compare the performance of NFS and iSCSI network protocols to see which one is more suitable for building a virtualized infrastructure. Create multiple LUNs, one for each processor thread on the NAS. Performance Because the iSCSI protocol works at the block level, it can generally provide higher performance than NFS by manipulating the remote disk directly. These were our conclusions at the time : NFS was much slower than NFS, because of sync=true. The results demonstrate that Chelsio’s NIC provides consistently superior results, lower CPU utilization, higher throughput and drastically lower latency, with outstanding small I/O performance. Apr 4, 2024 · Discover SPDK iSCSI vs NVMe-oF benchmarks and learn which protocol delivers better speed, efficiency, and performance for your workloads and IT use cases. Discover the benefits, components, performance tips and best practices. We recently did a benchmark between XCP-NG and VMware since I suggested we should migrate everything over to XCP-NG due to the licensing changes on VMWare but we changed our minds after the tests. If issues occur with storage system performance, consult your storage system vendor’s documentation for any relevant information. With open-iscsi over TCP, I see very low numbers: * iops: READ - 20000, WRITE - 13000 * throughput: READ - 185, WRITE - 185 In open-iscsi. I'm having some trouble identifying where the performance issues are. legacy: NVMe and SCSI storage fabrics compared For those investigating their next-gen fabric solution, here's an in-depth analysis and comparison of iSCSI, NVMe over TCP, NVMe over Fibre Channel and SCSI over Fibre Channel, with real-world testing and results. Performance in a Virtual Environment iSCSI offers the best performance value for adding storage space to a virtual host. Sep 19, 2019 · 4 You're using a much too small dataset for your benchmark to have any value, and you don't provide enough information by far. This might seem a random number, but the idea was that it should fit 6 test files of 16 GB each, so ~96 GB (the 16 GB is actually random). for the test propose I This paper presents 100 Gb/s iSCSI performance using Chelsio’s T62100-CR Unified Wire adapter on a Windows Server 2019 server running Chelsio’s iSCSI initiator offload driver. This knowledge is based on real-world experiences of iSCSI deployments that I’ve encountered over the years Feb 16, 2010 · With the release of Windows Server 2008 R2, the Windows Server platform has evolved into a robust and scalable platform aimed squarely at the heaviest data center loads – and we’re always looking at new ways to prove it. Some obvious things that affect iSCSI performance include the TCP/IP network topology and throughput, the speed of the processors, and the speed of the target disks. Are you using a zvol or file for your iSCSI disk? Typically files are much faster. Learn how to optimize your NAS setup for accurate and meaningful benchmarking results. Jan 28, 2016 · linux iscsi I recently encountered some performance issues using iSCSI. 3. 5U1) with HP Proliant DL380 Gen8 & Gen9 hosts and two iSCSI storage solutions: a P4300 G2 SAN that has two chassis with 8x15K RPM disks in each + 2x 1 Gbps NIC ports a QNap NAS with 4X SSD drives and 4x 1 Gbps NIC Ports Each ESXi host has 2x NICs (1 Gbps) for iSCSI and are connected to the storage devices via a couple of interconnected ProCurve Jul 23, 2019 · 7) NetData freezes during iSCSI benchmark I also noticed that NetData refreshed nicely every second when benchmarking SMB and NFS, but froze for about 3-5 seconds constantly when benchmarking iSCSI. Our micro- and macro-benchmarking results on the Linux platform Jan 14, 2019 · I thought that switching from NFS to iSCSI would provide increase performance for datastores on ESXI. all of the network is 1 Gbe network and all of the connections go through unmanaged switch. The switches considered should be able to support full wire speed on its ports. Sep 4, 2024 · Thanks to the multipath (MPIO) supported by the iSCSI protocol, you can improve the performance of the datastores of your VMware vSphere virtual infrastructure created on your NAS or iSCSI server. So, we ran a Sep 15, 2023 · iSCSI Disadvantages Latency: In latency-sensitive environments, iSCSI may not perform as well as FC or FCoE. Oct 12, 2023 · iSCSI is a storage protocol for connecting computers and storage devices over an IP network. Difference between NFS and iSCSI You can use iSER (iSCSI Extensions for RDMA) for faster data transfers between QNAP NAS devices and VMware ESXi servers. Numerical results using popular benchmark have shown dramatic performance gain. The LUN performance required by the ESXi Dec 8, 2024 · CriytalDiskMark Benchmark In my tests with CrystalDiskMark, I observed that both network adapters showed significant performance improvements as a result of these optimizations. that is also part of a broader series focused on server storage I/O benchmarking, performance, capacity planning, tools and related technologies. Iscsi/tests Contents 1 fio 2 mir's tests 3 sys4 tests 3. Learn more about how it works and its benefits. Nov 8, 2024 · iSCSI provides high-performance block-level storage over IP, ideal for databases/virtualization, while NFS offers simpler file-level sharing with lower setup. The load on the DS also was subjectively lower than when doing the iSCSI work. What I eventually got seems to work and it enabled me to make data-driven performance projections with different Progressively upping the queue depth eventually gets performance to line rate, but it disappointing to me that FreeNAS could provide better performance with a QD of 1. All KVM machines reside on that Storage. 2 iSCSI vlans Distributed Switch, with 4 uplinks. Now for the test, First of all I enable the iSCSI service on some srv 2016 that we have. Everything seems to work, just crawls. Purpose The purpose of this white paper is to help Dell PowerStore customers understand the performance and cost tradeoffs when using one Transport Protocol versus another. 04 (Trusty Tahr) with 16 GB RAM and 16 core CPU as LVM backed iSCSI target using three Samsung SSD disks, each capable of doing 65k IOPS using an LSI 6 Gbit/s cont Jun 12, 2024 · Yes it is a lot slower, but you get thin provisioning and a very simplified network configuration compared to iSCSI or fiber channel. iSCSI data links on each StarWind node should have similar performance rates, otherwise, StarWind Virtual SAN will run at the performance rate of the slowest node. 6 days ago · This technote presents a performance comparison of iSCSI and NVMe/TCP shared storage in a Proxmox/QEMU virtual environment. 2. 1. The T580 notably Mar 22, 2015 · iSCSI Target Ubuntu 14. Generally, NFS storage operates in millisecond units, ie 50+ ms. Just to remind you, our configuration environment looks like this: May 21, 2012 · Want to access your network-attached storage drive a little faster? We explain how to configure and use an iSCSI target on a NAS server with Windows' built-in iSCSI initiator for fast access. This exercise forced me to try to produce a model that describes the throughput of iSCSI requests. We use Iometer at VMware for all of our storage tests Hello Everyone. This is quick and dirty tuning Nov 29, 2012 · What you need to know about improving iSCSI performance Storage expert Dennis Martin discusses how technologies like Data Center Bridging, CHAP, IPsec and iSCSI offload adapters affect iSCSI performance. 2 4 drive mirror, without a log drive 3. From the world’s leading provider of high-performance storage & network connectivity products, ATTO Disk Benchmark for Windows is the tool that top drive manufacturers use to build and test drives, IT professionals use to maintain IT ecosystems, and leading hardware review sites include in benchmark suites. 0. Also, we know Fibre Channel networks are dedicated over SAN switches but somehow iSCSI tests are conducted on a shared backbone or edge switches. Each with a size quota of 120 GiB. 10. The primary thing to be aware of with NFS - latency. Please, refer to the “Synchronization Channel Recommendations” chapter of the StarWind High Availability Best Practices guide. Just finished setting up a poor mans SAN with iSCSI and want to benchmark it. What are some good I/O performance benchmarks for Linux besides: hdparm -tT /dev/sda1 How do I get a IOPS measurement? Nov 25, 2009 · Hi. 3 6 sata drive mirror with ssd log 4 2 drive sata mirror iSCSI Performance Expectations, Looking for adequate, cheap iSCSI share TrueNAS Scale on i7 6800, 32GB, 10gbps, 2x2TB stacked vdev on NVMe drives performing great for 10+VMs and it seems it will scale with what I need it to do for my fastest (and most expensive) iSCSI share Feb 1, 2015 · Microsoft Diskspd (Part II): Server Storage I/O Benchmark Tools This is part-two of a two-part post pertaining Microsoft Diskspd. $ blockdev --getra /dev/sda 256 By Dec 14, 2023 · Learn about storage I/O performance considerations in Hyper-V performance tuning, including advantages, limitations, and recommendations. That conversation I mentioned earlier made me realize that I had never run the full benchmark suite, which includes the smaller file-size NASPT tests. Disclaimer For example, comparing 1G iSCSI vs 8G Fibre Channel. first of all I’m new to the “iSCSI world”, the goal is to create a storage\\drive on a server (win srv 2016) that has a lot of storge in it for a dedicated win 10 computer. With that said, my goal, is to exceed the performance of a locally installed NVMe, but, over a network. Dec 31, 2007 · Hi, I'm running some performance tests with open-iscsi (iops & throughput). I'm attempting to setup a iSCSI server for VMWARE with NVME storage. 2 kvm 3. Using Crystal disk mark, we see the below performance for reads and writes. Did anyone measure open-iscsi performance lately? Can you share your numbers? Which iscsid. Learn which option is best for sharing files, running VMs, and maximizing performance. Jan 22, 2025 · Key Considerations for Benchmarking Network Storage Performance January 22, 2025 When measuring network storage performance, it’s essential to account for factors like protocols, workloads, and testing tools. conf file About This Book This book, Performance Best Practices for VMware vSphere 8. Jan 18, 2014 · While the read performance is similar, the write performance for the NFS was more consistent. When allocating LUNs or RAID groups for ESXi systems, remember that multiple operating systems use and share that resource. SMB, NFS, and iSCSI each bring unique strengths and challenges to the table. However, iSCSI SAN runs on the standard Ethernet and TCP/IP network which is shared with communication and other data channels. Above the ISCI there's a LVM. In an iSCSI network, storage systems are targets that have storage target devices, which are referred to as LUNs (logical Feb 20, 2019 · Each link between StarWind 2 and Hypervisor 2. Set the following configurations to get the best performance from iSCSI. 0 host. How are the samba share and iSCSI target configured? What is the hardware configuration like on both ends of the link? First, 3 of your results (CIFS read and write, iSCSI read) ran at link speed. It is not intended as a comprehensive guide for planning and configuring your deployments. After hours of googling and trial and errors, here are some points related to the performance of iSCSI. Nov 3, 2023 · Can you recommend any monitoring tools or strategies to keep track of iSCSI storage health and performance in a Proxmox environment? How can I troubleshoot and resolve common problems related to iSCSI server storage in Proxmox, such as connection issues or performance bottlenecks? Regarding iSCSI vs NFS : We experimented with both. You can view part-one of this post here, along with companion links here. 2 uplinks are dedicated to iSCSI (1 for each iscsi vlan) and the other 2 are for all other traffic. , aio native, io_uring, and iothreads) and the deep dive into optimizing guest storage latency. To provide redundancy for software iSCSI, make sure that the initiator is connected to all network adapters used for iSCSI connectivity. At the end of this iSCSI vs NFS speed comparison, it should be mentioned that performance also depends on the storage array vendor. The iSCSI protocol standard is defined by RFC 3720. It is important to understand, that this does not mean that Jan 8, 2025 · Explore the benefits of NVMe over TCP vs iSCSI. Storage System Performance Storage system performance is one of the major factors contributing to the performance of the entire iSCSI environment. Aug 6, 2022 · For NFS and iSCSI testing, i spun up a single VM and placed a disk on each type of Data store. I use the open-iscsi implementation on the client side. Jun 24, 2020 · 7) NetData freezes during iSCSI benchmark I also noticed that NetData refreshed nicely every second when benchmarking SMB and NFS, but froze for about 3-5 seconds constantly when benchmarking iSCSI. So, in this part, we’ll create an iSCSI device and connect it to the VMware ESXi host. What Is FC? I'll be rebuilding my storage solution soon with a focus on increasing performance and want to consider the role of this config. For benchmarking the performance of iSCIS, we created an iSCSI connection to the NAS and benchmark the NAS using Intel’s IOMeter. When I test over… If using a 25-Gbps iSCSI channel board does not achieve the level of I/O performance you expected, performance might improve by configuring the following parameters in hosts. 0, provides performance tips that cover the most performance-critical areas of VMware vSphere® 8. Jun 2, 2025 · NFS vs iSCSI: Compare performance, scalability, and security to choose the best storage protocol for your virtualized environment. Nov 14, 2023 · Learn what iSCSI is, how it works, and how it compares to NFS, NAS, and Fibre Channel. While they’re both data sharing protocols, Network File System (NFS) and Internet Small Computer System Interface (iSCSI) operate quite differently. Performance comparison between iSCSI and other hardware and software solutions Mathias Gug CERN, Geneva, Switzerland We report on our investigations on some technologies that can be used to build disk servers and networks of disk servers using commodity hardware and software solutions. Oct 29, 2024 · IO Performance Comments: There is a big performance increase from ISCSI + v1 volume to UBLK + v1 engine: 4x IOPs 3x sequential read bandwidth 13x sequential write bandwidth Latency cut by around 80 us There is a big performance increase from UBLK + v1 volume to NVMe-oF + v2 engine except for the bandwidth: Confused about NFS vs. We received excellent feedback from the previous storage performance investigations, particularly the technotes on optimal disk configuration settings (i. Experience significant improvements in IOPS and latency for enhanced storage efficiency. NFS adds a layer of file system IP-networked storage protocols such as NFS and iSCSI have become increasingly common in today's LAN environments. Performing the iSCSI benchmark has almost no load on the CPU of the storage server so I can't attribute it to the lower-end CPUs. Introduction This paper compares the performance of various storage protocols available on VMware vSphereTM 4. I notice that iSCSI has slow reads but fast writes and NFS has fast reads and slow writes. I would like to try the iscsi share or the zfs-iscsi on proxmox. After a bit of research, and not finding much conclusive information on what would constitute a reasonable Jan 19, 2023 · Find out the Fibre Channel vs. So how does qcow2 over NFS compare to raw over iSCSI for ZFS? Speed vs. 3. iSCSI JBOF with T7 Using Chelsio T7, Celestica Nebula G2 & Micron SSD NVMe/TCP & iSCSI JBOF with T7 Using Chelsio T7, ASMedia PCIe Switch & Samsung SSD Windows iSCSI Performance at 100Gbps Zero Copy Performance using iSCSI Offload Dell EMC Storage Center & Chelsio Chelsio 25Gb & 100Gb iSCSI adapters,a key piece in Dell EMC’s all flash Storage Center array performance enhancements 100G iSCSI Why benchmark In short: benchmarking is a good tool for determining the speed of a storage system and compare it to other systems, hardware, setups and configuration settings. If you want to test Microsoft's iSCSI initiator, you are probably better off using Microsoft's instructions. The configuration used for testing as Dec 31, 2023 · I have run some tests on my iSCSI backend, with the intent of planning several upgrades, including routing ethernet cables to the studio, as I am currently on a wireless network. Windows Server OS After the above configurations are confirmed, you may or may not encounter slow performance when testing read/write performance with through iSCSI connections, if you were suffering with slow performance, please try to adjust below parameters on server’s HBA driver: A subreddit for enterprise level IT data storage-related questions, anecdotes, troubleshooting request/tips, and other related discussions. Mki have reported that in terms of performance iscsi is more powerful, moreover it is a block system Hi all, after experiencing the annoying task of rebuilding a 3-node Proxmox cluster, following a power outage that killed 2 USB drives and corrupted a third one, I've been fiddling around with the idea of offloading all VM storage into a NAS and running VMs off that with iSCSI. Now that I need to add a shared storage I've seen a significant performance degradation in Proxmox iSCSI initiator on 5-node cluster. To assist Synology partners and prospective customers, the new web page incorporates performance benchmarks for common storage protocols: SMB, iSCSI, and NFS. I use a nas xigmanas (for years), I have a disk in zfs to use as storage. Executive Summary This paper presents NIC and iSCSI performance results comparing Chelsio’s T580-CR and Intel’s latest XL710 “Fortville” server adapter running at 40Gbps. **iSCSI Performance**: While iSCSI doesn’t rely as much on synchronous writes, it still benefited from the SLOG, with performance improving from 2 minutes 41 seconds to 1 minute 43 seconds (a 35. Round Robin Policy Set for all datastores, Round Robin IOPS set to 3 I don't see any errors/warnings in vmware/san. iSCSI technologies that meet your performance, ease of use, manageability, total package and TCO requirements. The other response about Iometer being unable to test iSCSI is not correct. This paper illustrates the significant performance impacts of additional factors including the LAN adapter driver, the cabling, the size of the data being read or written, and how the data is fragmented on the disk. We would like to show you a description here but the site won’t allow us. 1 raidz1 with a log drive 3. Then I created 3 sub-datasets/zvol: benchmark-iscsi, benchmark-nfs and benchmark-smb. Can someone please tell me how to make a performance test to a iscsi LUN? I have a 4-node cluster running, connected to a ISCSI on a netapp. Enabling iSER requires a compatible network card and switch. Performance: While suitable for many use cases, iSCSI may not match the speed and throughput of FC or FCoE in high-demand scenarios. Part 1 May 25, 2023 · When considering Fibre Channel vs iSCSI in your business application, you should carefully evaluate your requirements for performance vs cost-effectiveness before choosing between them. Performance: When it comes to the throughput speed of FC SAN vs iSCSI SAN, iSCSI SAN can support up to 100Gbps. Proxmox Jul 23, 2025 · ISCSI helps various authentication strategies and can leverage current infrastructure, making it a cost-effective solution for accessing and managing storage in data centers and business environments. 1 lxc 3. This paper identifies the performance bottleneck of iSCSI, and then proposes a distributed iSCSI RAID to improve the performance by stripping data among iSCSI targets (S-iRAID) and improve the reliability by using rotated parity for data blocks (P-iRAID). I ran a very simple benchmark, and I didn't expect it, but NFSv4 was faster than NFSv3 which was in Jumbo frames significantly improve performance for a software initiator to software target iSCSI network. This book consists of the following chapters: Nov 9, 2017 · Hello, We have a 3-node ESXi cluster (ESXi 6. Therefore, if your iSCSI network uses all software initiators and all software targets, and the network switches support jumbo frames, then use jumbo frames. iSCSI Performance Optimization You can optimize the performance of iSCSI by following one or more of these guidelines: Use thick provisioning (instant allocation). I just started looking at migrating from NFS to iSCSI on a 40gbe network with jumbo frames. Thick provisioning gives slightly better read and write performance than thin provisioning. Not sure if iSCSI is causing performance issues also outside of the NetData plugin, but it is concerning Jan 21, 2021 · Understanding your benchmark index: The performance tests of Synology NAS products are conducted using IOMeter as the benchmarking tool and SSDs as the storage media, and multiple workers and threads are running to maximize the throughput of the iSCSI storage. Not sure if iSCSI is causing performance issues also outside of the NetData plugin, but it is concerning. Mar 6, 2023 · Hi guy’s. Nov 12, 2024 · Hello, I'm trying to evaluate the performance differences on storage between ESXi and Proxmox. An iSCSI storage network should consist of enterprise-class Gigabit Ethernet switches that support advanced networking features such as link aggregation, jumbo frames, and VLANs. Jan 30, 2024 · Hi All, I thought I would post a quick “how-to” for those interested in getting better performance out of TrueNAS Scale for iSCSI workloads. The test used the industry-standard flexible input/output (FIO) benchmark tool with identical setups for iSCSI and NVMe/TCP. The foundation of a performance-oriented iSCSI solution is the storage network. Notably, the addition of a new benchmark designed to measure latency at 80% of the peak IOPS over iSCSI and NFS lets IT admins accurately gauge latency-sensitive workloads. Furthermore, thanks to using the routable and reliable TCP/IP as a foundation, iSCSI allows highly Sep 12, 2023 · Find out which protocol delivers better performance for mission-critical apps and learn how to configure the NFS protocol for further testing. Iometer is used to generate the I/O workload. That’s more than double what I was getting previously with 2x10Gbe connections previously. Jan 21, 2021 · Understanding your benchmark index: The performance tests of Synology NAS products are conducted using IOMeter as the benchmarking tool and SSDs as the storage media, and multiple workers and threads are running to maximize the throughput of the iSCSI storage. Throughout the testing we use the same configuration of VMware ESX servers to provide an apple–to-apples comparison of Fibre Channel (traditional FC), NVMe/FC, NVMe/TCP and iSCSI. Using a single iSCSI target, the results show 40Gb line rate performance using standard Ethernet frames with I/O sizes as small as 2KB, and more than 3M IOPS for 512B and 1KB I/O sizes. So please, change my mind! Oct 10, 2024 · Instructions on how to experience improved iSCSI performance in a virtual environment. Using the same hardware between tests I'm getting drastically different results when comparing the two hypervisors. When I test locally on the server performance is fantastic. Several community members asked us to quantify the difference between iSCSI and NVMe/TCP initiators in Proxmox. We outline some of their distinct features next. Recently, in conjunction with Intel hardware, Windows Server 2008 R2 and Hyper-V achieved amazing throughput results But the iSCSI benchmarks run only the Windows File Copy tests, which measure only large file size performance. Iometer is the perfect tool for that. Feb 10, 2025 · Proxmox iSCSI Performance Issue - Support Report Executive Summary For more than a year I've been using this great product and had worked flawlessly. iSCSI? Understand file-level vs. The easiest way to increase that is likely to put more NICs in both the storage server and the hypervisors and use port aggregation. There isn't any real use-case other then making pretty benchmarks, as my remote storage is already plenty fast for my use cases. When using async, performance was similar to iSCSI, but it seemed dangerous to use it because you can loose data on power outage. IOMeter has to be one of the most widely used software packages for benchmarking disks. Without comparison, the benchmark is totally useless, therefore you need to have the same test environments and this page exists to lay down some ground rules. iSCSI has no compression, and the expected tranfer rate will be even lower when you take (Ethernet, IP and iSCSI) protocol overhead into account. Readahead The performance is highly dependent on the block device readahead parameter (sector count for filesystem read-ahead). dbgcol cwiqbqn obtqlt qepyf ipph qes gfqge mzbuld yfap upoee kxzilc lvnkxe ndlqjxb jfacok cvhe