[ale] md0 tasks taking 60-80% of CPU

[JK]

Jeffrey B. Layton wrote:

>>Hi everyone,
>>
>>I forgot the root password for my fileserver machine (which runs
>>FC2), so I booted it into Knoppix to "fix" /etc/shadow.  The fileserver's
>>/etc is on a RAID1 device, /dev/md0, so I manually assembled the
>>array using "mdadm" and mounted it. I was then able to reset the
>>root password.
>>
>>However, as soon as I mounted /dev/md0, I noticed that the machine
>>got really sluggish.  I ran "top", and saw that md0_raid1 is taking
>>about 50% of the CPU, with md0_resync a close second at about
>>20%.  I left the machine booted into Knoppix overnight, with /md0
>>mounted, thinking that maybe it was doing some kind of RAID magic,
>>but ten hours later those tasks are still sucking down most of my
>>CPU cycles.  Surely this is not expected behavior?
>>
>>-- JK
>>  
>>    
>>
>
>How big is the RAID-1 file system? Also, is the machine swapping?
>  
>
160GB, approximately.  The machine is not swapping.  ("Swap: 1044208k 
total, 0k used").

Thanks,

-- JK