… out there that discuss RAID minutia. Make sure you cover the following: RAID type (usually 5 or 1+0) RAID stripe size BBU enabled with… it is aligned with the RAID stripes? It takes a small amount of math: Start with your RAID stripe size. Let’s use 64k which…: RAID stripe size Number of unique, utilized disks in the RAID. This turns out to be the same as the size formulas I gave above: RAID…
Post: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 15 Comments
… sure file starts in a proper position with respect to stripe size. The size of logical IO units also is up to the…. RAID stripe Further down below on the storage stack there’s a group of RAID stripe units (elements) sometimes referred to as a stripe though most of the tools refer to it as a stripe width. RAID level…
Comment: Setting up XFS on Hardware RAID -- the simple edition
December 16, 2011 By 9 Comments
… summary, what you are thoughts on RAID stripe size? I had a sysadmin change the strip size of the RAID control from the default (64k… a data block that is < RAID stripe size, in this case 256k. Does this mean that the RAID controller is not going to cut…? In my mind and what I have read, increasing the RAID stripe size typically doesn’t help with database work loads. You thoughts?
Comment: Maximal write througput in MySQL
March 1, 2010 By 10 Comments
… RAID-10 stripe sizes and the fact that actually a lot of Linux distros don’t have their default partition boundaries aligned on raid stripe sizes…/archive/articles/140734 http://www.linuxfoundation.org/collaborate/workgroups/linux-raid/raid_setup http://kbase.redhat.com/faq/docs/DOC-2893 { unfortunately…
Comment: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 15 Comments
… tables. Regarding RAID stripe size: during DBA classes in August, 2010 Morgan Tocker mentioned that it makes sense using larger stripe size than 64k on… your experience with that? Most people seem to run default stripe sizes provided by disk controllers they use. Thank you.
Comment: Setting up XFS on Hardware RAID -- the simple edition
December 17, 2011 By 9 Comments
The tuning of the file system for the raid stripe size is strange to me. What do you do when your … which allows for non disruptive addition of disks and re-striping of data over more disks as you add them to… eliminate the need to tune the file system for the RAID config. My storage array for example spreads i/o across…
Post: Aligning IO on a hard disk RAID – the Benchmarks
June 9, 2011 By 11 Comments
…, BBU Present BBU | 100% Charged, Temperature 34C, isSOHGood= VirtualDev Size RAID Level Disks SpnDpth Stripe Status Cache ========== ========= ========== ===== ======= ====== ======= ========= 0(no name) 1.088 TB… – IO alignment on a 4-disk RAID10 with standard 64k stripe element size makes a significant difference. When I launched the system…
Comment: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 15 Comments
… “stripe size” to call what other tools call stripe element, stripe unit or chunk. Here’s definition from the manual v1.0 (2006): Stripe Size: The stripe size specifies the size of the segment written to each disk in a RAID configuration. You can set the stripe size to 8, 16, 32, 64, or 128 Kbytes. A larger stripe size produces higher…
Comment: Setting up XFS on Hardware RAID -- the simple edition
December 18, 2011 By 9 Comments
… size and a stripe size whereas http://www.pcguide.com/ref/hdd/perf/raid/concepts/perfStripe-c.html and http://www.tomshardware.com/reviews/RAID-SCALING-CHARTS,1735-4.html refer to stripe size as strip size…
Comment: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 15 Comments
… on the workload and the RAID controller, I think it’s fine to have a relatively small stripe size as long as IO is aligned (but not smaller than your working block size – 16k in InnoDB by default). When misaligned, larger stripe may make a bit more sense…
