Benchmarking linux filesystems on software raid 1 lone. Software vs hardware raid nixcraft linux tips, hacks. Changing the storage parameters and would like to know the performance impact of this change this article gives you a jumpstart on performing benchmark on filesystem using iozone a free filesystem benchmark utility. Want to get an idea of what speed advantage adding an expensive hardware raid card to your new server is likely to give you. Mpiio, and for the btio benchmark with a noncontiguous access pattern. My own tests of the two alternatives yielded some interesting results. All drives are attached to the highpoint controller. Optane ssd raid performance with zfs on linux, ext4, xfs, btrfs. Software linux raid 0, 1 and no raid benchmark osnews. We will dive into configuration details and benchmarks of. Hardware benchmarking assesses many different attributes such as the performance of the processor, memory.
Software raid is used for all of the biggest, fastest systems for a reason. Software vs hardware raid performance and cache usage server. Performance comparison of mdadm raid0 and lvm striped. High performance scst iscsi target on linux software raid. Please remember with raid10 50% of your hard disk space will go to redundancy, but performance is almost the same as raid0 stripe. It is used to improve disk io performance and reliability of your server or workstation. In the graphs comparing raid 10 of 4 drives to the performance of a single drive i see a slight increase of write performance and a 100% increase in writes. I noticed that performance is much slower when the data are on my 2recentspinningharddrivesoftwareraid1 than when they are on an older spinning hard drive without raid. Pdf linux clusters of commodity computer systems and interconnects have become the. The 16mb cache on each is probably what gets the cached read so high. Changing the raid level and would like to measure the performance of the new raid.
Alternatively, launch the gnome disk utility from the command line by running gnomedisks. While the intel raid controller blows the software raid out of the water on sequential reads, surprisingly the windows software raid was better in nearly every other respect. March 21, 2020 steve emms software, system software, utilities. Ive personally seen a software raid 1 beat an lsi hardware raid 1 that was using the same drives. But with software raid it goes to a faster cpu, with hardware raid it goes to a slower one. One thing i would like to do in the future when i have more disks is to rerun these benchmarks on a raid 5 array and vary the chunk size. It seems that no matter if you use a hardware or a software raid controller, you should expect to lose performance when youre duplicating every write, which makes sense. Unless software raid and linux io options in general start advancing at an absurd rate, there will remain a market for real enterprise storage technologies for a long, long time. For what performance to expect, the linux raid wiki says about raid 5.
Ssds offer different read and write speeds, form factors, and capacity. Below is a sample of the material from the white paper. Disk benchmark is one of the better benchmarking tools for hds and ssds. This section contains a number of benchmarks from a realworld system using software raid. Linux has an advanced softwareraid layer that not only supports different raid level eg. You can benchmark the performance difference between running a raid using the linux kernel software raid and a hardware raid card. To deal with software raid devices, you have to install mdadm first, create the raid device manually, this has only to be done the first time. There is some general information about benchmarking software. Also, just did some testing on the latest mlc fusionio cards and we used 1, 2 and 3 in various combinations on the same machine. A raid can be deployed using both software and hardware.
Linux software raid mdadm testing is a continuation of the earlier standalone benchmarks. Individually they benchmark using the ubuntus mdadm gui. In testing both software and hardware raid performance i employed six 750gb samsung sata drives in three raid configurations 5, 6, and 10. Also, the countless possibilities for optimization were ruled out in the tests e.
A benchmark is the act of running computer programs in order to assess the performance of computer hardware and software applications. Data protection and performance benefits of raid more robust faulttolerant features and increased performance versus softwarebased raid. The drives are seagate 500gb 16mb cache pata and there are 2 in raid 0 running software raid. In general, software raid offers very good performance and is relatively easy to maintain. A more realistic image of postgresql performance were provided by read write tcpb benchmark. The drives used for testing were four ocztoshiba trion 150 120gb ssds. Linux software raid mdadm testing is a continuation of the earlier. Software raid how to optimize software raid on linux. Raid5 is just the first example, and we hope our approach will inspire others to benchmark availability of other subsystems. As the linux software raid howto says, the combination of chunk size and block size matters for your performance. The comparison of these two competing linux raid offerings were done with two ssds of raid0 and raid1 and then four ssds using raid0, raid1, and raid10 levels. Linux benchmark scripts and tools last updated may 31, 2019 published april 6, 2019 by hayden james, in blog linux.
For what its worth, i run software raid on my box at home because for my home environment it really does have the best cost benefit. Benchmark samples were done with the bonnie program, and at all times on files twice or more the size of the physical ram in the machine. A few months ago i posted an article explaining how redundant arrays of inexpensive disks raid can provide a means for making your disk accesses faster and more reliable in this post i report on numbers from one of our servers running ubuntu linux. The theoretical and real performance of raid 10 server. Raid0 with 2 drives came in second and raid0 with 3 drives was the fastest by quite a margin 30 to 40% faster at most db ops than any nonraid0 config. Disk benchmark measures raw transfer rates for both reads and writes and places the data into graphs which you can. The controller is not used for raid, only to supply sufficient sata ports. For a raid 1 array this doesnt matter since there is no chunk size to deal with. How to measure linux filesystem io performance with. A redundant array of inexpensive disks raid allows high levels of storage reliability. Mdadm is linux based software that allows you to use the operating system to create and handle raid arrays with ssds or normal hdds. We found that software raids have a comparable performance to hardware. Software raid 5 write performance i have a media server i set up running ubuntu 10. The benchmark script prepared each filesystem for the benchmark run with the appropriate mkfs tool on zfs, this was zpool without further options.
Linux disks utility benchmark is used so we can see the performance graph. Raid functions are performed on a microprocessor located on the external raid controller independent of the host. A lot of software raids performance depends on the. The only real numbers of raid 10 performance relative to a single disk that i could find were in the zdnet article comprehensive raid performance report. Linux software raid has native raid10 capability, and it exposes three possible layout for raid10style array. A single drive provides a read speed of 85 mbs and a write speed of 88 mbs. Postgresql benchmark on freebsd, centos, ubuntu debian and. Raid level comparison table raid data recovery services. The real performance numbers closely match the theoretical performance i described earlier. There is some general information about benchmarking software too. This list of linux benchmark scripts and tools should prove useful for quick performance check of cpu, storage, memory and network on linux servers and vps. But the real question is whether you should use a hardware raid solution or a software raid solution.
Atto gives a truer reading for ssds than hdtune does. According to many mailing lists and the opinion of the linux raid author, raid10 with layout f2 far seems to preform best while still having redundancy. Now click benchmark measure drive performance button in right pane. Maybe with linux software raid and xfs you would see more benifit. I also set the chunk size of the raid array to 64k since i store a lot of large files on them. This white paper provides an analysis of raid performance and describes. While a file server setup to use software raid would likely sport a quad core cpu with 8 or 16gb of ram, the relative differences in performance. Last week i offered a look at the btrfs raid performance on 4 x samsung 970 evo nvme ssds housed within the interesting msi xpanderaero. These layouts have different performance characteristics, so it is important to choose the right layout for your workload. Raid 6 which intels integrated controller does not support will keep an array up even after two failures. Windows software raid has a bad reputation, performance wise, and even storage space seems not too different. Lets take a look at these two tools and see how they perform data striping tasks. In this article are some ext4 and xfs filesystem benchmark results on the fourdrive ssd raid array by making use of the linux md raid infrastructure compared to the previous btrfs nativeraid benchmarks.
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