[CentOS] RAID rebuild time and disk utilization....
rswwalker at gmail.com
Mon Sep 27 18:54:18 EDT 2010
On Sep 27, 2010, at 1:24 PM, Les Mikesell <lesmikesell at gmail.com> wrote:
> On 9/27/2010 12:19 PM, Benjamin Franz wrote:
>> On 09/27/2010 08:15 AM, Tom Bishop wrote:
>>> So I'm in the process of building and testing a raid setup and it
>>> appeared to take along time to build I came across some settings for
>>> setting the min amount of time and that helped but it appears that one
>>> of the disks is struggling (100 utilization) vs the other one...I was
>>> wondering if anyone else has seen this and if so, is their a solution
>>> for it...my 2 disks are 1 Samsung F3 1tb /dev/sdb and 1 Seagate
>>> 7200.12 1Tb /dev/sdc...smartctl looks good on both....
>> What is the output from 'cat /proc/mdstat'?
> Also, head position/motion is the usual limiting factor with disk
> performance. Do you have other disk activity that will keep yanking the
> head on the active drive away from the track currently needed for the
Also, also, if any of the drives are operating in PIO mode (Legacy Mode) then rebuild times will be horrific, as well as performance afterward. Make sure all drives are in SATA/AHCI mode.
PS look at svc_tm in iostat and make sure all drives are performing correctly. Maybe a bad cable or flakey port expander...
More information about the CentOS