[CentOS] Software RAID1 Disk I/O

John R Pierce pierce at hogranch.com
Wed Jan 6 01:35:24 UTC 2010

Matt wrote:
>> That's working normally with the sync completed.  Mirrors should run at
>> close to the speed of a single drive.  Maybe you are just expecting too
>> much from SATA or you have something like an updatedb running.  An
>> 'hdparm -tT' against the partitions and md devices should give you an
>> idea of what the drives can do.  And top might show what's causing the
>> load (but maybe not if it is mostly waiting on disk seeks).
> There should currently be virtually NO disk I/O on this box right now.
>  Its a bare install and I have not installed any apps yet.  Is there
> an easy way to tell whats using all the I/O?  The drive activity light
> never goes off.  I did a torch in my firewall router and there is no
> network activity going to it.

top, atop, lsof

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