[Lustre-discuss] Backing up Lustre Journal

[Alastair Ferguson]

OK great.

Thanks,

Alastair Ferguson
IT Manager
Capital Markets CRC Limited (CMCRC)
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On 20 Jun 2014, at 11:45 am, Dilger, Andreas <andreas.dilger at intel.com> wrote:

> On 2014/06/19, 6:55 PM, "Alastair Ferguson" <aferguson at cmcrc.com<mailto:aferguson at cmcrc.com>> wrote:
> 
> OK, so I have a RAID1 array used as Journal disk for two 14TB OSTs. this has 2 x 2GB partitions on 2 x 2TB physical disks.
> 
> [root at silicon ~]# fdisk -l /dev/sdav
> 
> Disk /dev/sdav: 2000.3 GB, 2000398934016 bytes
> 255 heads, 63 sectors/track, 243201 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sdav1               1          56      449788+  fd  Linux raid autodetect
> /dev/sdav2              57         112      449820   fd  Linux raid autodetect
> 
> One of the RAID1 disks is about to fail and before I replace it I would like to back up the journals so I can recover.
> 
> There doesn’t seem to be any information on how to do this.
> 
> Can I mount -t ldiskfs and then rsync the information somewhere just in case the RAID1 replacement doesn’t work?
> 
> What is the procedure for this?
> 
> There is nothing to back up on the journal disk.  This is only needed in case of a crash and to avoid e2fsck on recovery.  If you make a backup of the filesystem that is enough.
> 
> 
> Cheers, Andreas
> --
> Andreas Dilger
> Lustre Software Architect
> Intel High Performance Data Division

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