A quick reboot will likely restart (start) the RAID sync or you can try
adding the slice back in as follows:
#
# Look at each partition
#
lsraid -a /dev/md0
#
# Add new disk back into the array
#
raidhotadd /dev/md0 /dev/sda1
This presumes the lsraid shows it is not in the array any longer..
Not an expert here, just passing on what I know..
=ed> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
> Behalf Of Jerry Geis
> Sent: Monday, March 12, 2007 3:01 PM
> To: CentOS ML
> Subject: [CentOS] raid array device partition missing
>
> From looking at mdstat it appears I have a RAID partition missing.
> There are NO errors in /var/log/messages about disk errors or anything.
> What happened to my sda1??? I had a power outage last week.
>
> Any ideas??? Jerry
>
> more /proc/mdstat
>
> Personalities : [raid1]
> md1 : active raid1 sdb3[1] sda3[0]
> 236717696 blocks [2/2] [UU]
>
> md0 : active raid1 sdb1[1]
> 51199040 blocks [2/1] [_U]
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