… been using on Windows Platform, not Linux. I think this issue applies to any RAID-0 volume regardless of hardware or software platform. If even one drive in a RAID-0 stripe set is unable to write its portion of…, but that is my experience with Windows software Raid-0. Maybe some raid-0 is smart enough to ignore an incomplete stripe…
Comment: Review of Virident FlashMAX MLC cards
April 25, 2012 By 14 Comments
Bob, That’s good information. I am always somewhat hesitant about linux software raid. Even Linux is incredible popular, it feels it is still not mature enough in many areas, including IO.
Post: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 15 Comments
… System /dev/sda1 * 2048 19531775 9764864 83 Linux /dev/sda2 19531776 27920383 4194304 82 Linux swap / Solaris Partition 2 does not end… 19535039 9767488+ 83 Linux /dev/sda2 19535040 27342629 3903795 82 Linux swap / Solaris /dev/sda3 27342630 2339835119 1156246245 8e Linux LVM sda1 and sda3 do not even align to 1k. sda2 aligns up to 32k but the RAID controller…
Post: Setting up XFS on Hardware RAID -- the simple edition
December 16, 2011 By 9 Comments
… End Blocks Id System /dev/sda1 2048 7813119 3905536 82 Linux swap / Solaris Partition 1 does not end on cylinder boundary. /dev/sda2 * 7813120 27344895 9765888 83 Linux /dev/sda3 27344896 856422399 414538752 83 Linux Several months ago my colleague Aurimas posted two excellent blogs on both the theory of Aligning IO on hardware RAID…
Post: Recovering Linux software RAID, RAID5 Array
August 27, 2011 By 2 Comments
… login via SSH it can be recovered as any generic Linux server. When you restart the system RAID5 volume which has… : Fri Aug 26 13:51:11 2011 Raid Level : raid5 Used Dev Size : -1 Raid Devices : 6 Total Devices : 5 Persistence : Superblock… Creation Time : Fri Aug 26 13:51:11 2011 Raid Level : raid5 Raid Devices : 6 Avail Dev Size : 5851089777 (2790.02 GiB…
Comment: Maximal write througput in MySQL
March 1, 2010 By 10 Comments
… that actually a lot of Linux distros don’t have their default partition boundaries aligned on raid stripe sizes (due to 63… some interesting links: http://www.linux.com/archive/articles/140734 http://www.linuxfoundation.org/collaborate/workgroups/linux-raid/raid_setup http://kbase.redhat.com…
Post: EC2/EBS single and RAID volumes IO benchmark
August 6, 2009 By 13 Comments
…/md2 –chunk=256 –level=raid0 –raid-devices=2 /dev/md0 /dev/md1 And also in Linux you can create tricky RAID10,f2 (you can read what is this here http://www.mythtv.org/wiki/RAID) mdadm… EC2/EBS environment it’s definitely worth to consider some RAID setup. RAID5 does not show benefits comparing with others, and…
Post: Aligning IO on a hard disk RAID – the Benchmarks
June 9, 2011 By 11 Comments
…): # Aspersa System Summary Report ############################## Platform | Linux Release | Ubuntu 10.04.2 LTS (lucid…Disk Schedulers And Queue Size ############################# sda | [deadline] 128 # RAID Controller ############################################ Controller | LSI Logic MegaRAID SAS …
Post: fsyncs on software raid on FusionIO
March 23, 2010 By 6 Comments
… and totally relies on OS tools there. So for Linux we have software RAID and LVM, I tried to followup on my…-requests=0 run And next steps is to check how RAID setup affects IO throughput.
Post: Fast storage: 8 SSD Intel X-25M 80GB benchmarks
January 18, 2010 By 15 Comments
… there some serialization in Linux software raid or Linux scheduler or on Adaptec hardware level. 2. Cards connected in hardware raids show worse results… summary table, randwr rows) 3. For cards connected in hardware raids, DEADLINE performs much worse than CFQ. Sequential reads: – For sequential…
