… different 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…
Post: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 15 Comments
…starts in a proper position with respect to stripe size. The size of logical IO units also is up… Recent systems like RHEL6 (not verified) and Ubuntu 10.04 (verified) would by default align to …as a stripe width. RAID level, number of disks and the size of a stripe element set the stripe width size. …
Post: Setting up XFS on Hardware RAID -- the simple edition
December 16, 2011 By 9 Comments
… and keeping in mind future growth. 8-16G for Swap — 10-20G for the OS (/) Possibly 10G+ for /tmp (note you… 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 Benchmarks
June 9, 2011 By 11 Comments
… System Summary Report ############################## Platform | Linux Release | Ubuntu 10.04.2 LTS (lucid) Kernel | 2…| 100% Charged, Temperature 34C, isSOHGood= VirtualDev Size RAID Level Disks SpnDpth Stripe Status Cache ========== ========= ========== ===== ======= ====== ======= ========= 0(no …
Post: How multiple disks can benefit for single client workload ?
April 26, 2008 By 4 Comments
…drives to pick reading any block. RAID controller (and even software RAID driver) typically tracks disk head …1TB hard drive you will have 10 seeks condensed in 1/10 of the full seek distance. …to deal with not even mentioning various seriolization, stripe sizes, cache policies, filesystem and OS …
Post: Looking for RAID Controller without Battery Learning problems ?
January 5, 2012 By 7 Comments
… 0 Logical device name : RAID10-A RAID level : 10 Status of logical device : Optimal Size : 571382 MB Stripe-unit size : 256 KB Read-cache mode… Partitioned : Yes Protected by Hot-Spare : No Bootable : Yes Failed stripes : No Power settings : Disabled ——————————————————– Logical device segment information ——————————————————– Group 0…
Comment: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 15 Comments
… disks, and I have: Stripe Size : 64kB So, what is the formula for determining width? It’s raid 10, so you said N/2…
Post: Innodb Double Write
August 4, 2006 By 23 Comments
… sizes by default so 16K could use more than one fragment. Also if software RAID is used page may come on the stripe border requiring multiple IO requests. Same happens with Hardware RAID on power…. So in general I would expect no more than 5-10% performance loss due to use of doublewrite. Can you disable…
