On 1/5/2010 5:29 PM, Matt wrote:
>>> I just installed CentOS 5.4 64 bit release on a 1.9ghz CPU with 8gB of
>>> RAM. It has 2 Western Digital 1.5TB SATA2 drives in RAID1.
>>>
>>> [root@server ~]# df -h
>>> Filesystem Size Used Avail Use% Mounted on
>>> /dev/md2 1.4T 1.4G 1.3T 1% /
>>> /dev/md0 99M 19M 76M 20% /boot
>>> tmpfs 4.0G 0 4.0G 0% /dev/shm
>>> [root@server ~]#
>>
>> Did you just create the RAIDs? It will something that size a few hours to
>> complete the initial sync. Try 'cat /proc/mdstat' to see when the sync
>> completes. Until then, expect to have head contention with anything else
>> that might be trying to use the drives.
>
> Here is what I got there. Md1 is swap I beleive:
>
> [root@server ~]# uptime
> 17:20:54 up 7 days, 3:26, 2 users, load average: 3.41, 2.93, 2.89
> [root@server ~]#
> [root@server ~]#
> [root@server ~]# cat /proc/mdstat
> Personalities : [raid1]
> md0 : active raid1 sdb1[1] sda1[0]
> 104320 blocks [2/2] [UU]
>
> md1 : active raid1 sdb2[1] sda2[0]
> 8385856 blocks [2/2] [UU]
>
> md2 : active raid1 sdb3[1] sda3[0]
> 1456645568 blocks [2/2] [UU]
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).
--
Les Mikesell
lesmikesell@xxxxxxxxx
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos
