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Subject:	RAID Issues
From:	CS_DBA <[log in to unmask]>
Reply To:	CS_DBA <[log in to unmask]>
Date:	Fri, 4 Apr 2014 11:17:22 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (50 lines)

Hi All;

We have a server running Scientific Linux 6.4 with a large 4.1TB RAID 10 
volume

We keep all of our KVM's on this volume

Today we found that we are unable to access the VM's

After some checking we found errors such as the ones below in 
/var/log/message

We unmounted the RAID volume (umount /dev/md0) thinking we could run 
some diagnostics and maybe fix it, however I'm less than up to speed on 
managing RAID volumes...

Can someone help me debug this? How do I run a "check" on a RAID volume?

Thanks in advance...



/var/log/message errors:

Apr  3 21:42:44 csdmz1 kernel: ata5.01: failed command: FLUSH CACHE EXT
Apr  3 21:43:58 csdmz1 kernel: ata5.01: failed command: FLUSH CACHE EXT
Apr  3 21:45:19 csdmz1 kernel: ata5.01: failed command: FLUSH CACHE EXT


Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964740 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964740 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964740 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964631 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964631 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964631 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964632 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964632 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964635 offset 0
Apr  4 03:26:05 csdmz1 kernel: EXT4-fs error (device md0): 
ext4_find_entry: reading directory #90964640 offset 0

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