[lustre-discuss] Making a copy of an OST
adilger at whamcloud.com
Tue Dec 4 01:22:46 PST 2018
On Nov 21, 2018, at 22:32, Roger Sersted <rs1 at aps.anl.gov> wrote:
> Lustre Server OS Version: CentOS 7.4
> Lustre Server version: 2.10.2
> Server Kernel version: 3.10.0-693.5.2
> Filesystem: ldiskfs
> I have an older disk array with a hardware failure. I suspect the
> drives and data are still valid.
> What I plan to do is migrate the data off of a similar model array, move
> the drives and migrate the data from the failed array. In order to do
> this, I need to migrate just an OST to a different device. I can't use
> lfs_migrate, because that works at the file level. I suspect the best
> route to go is to create a new device and use "dd" to copy the contents
> of the source device to the target device.
> Is there a better solution?
> Anything I should be aware of regarding dd and an OST?
> The arrays in question are enterprise class systems with caching
> controllers configured for RAID6.
I just noticed your email didn't get a response.
The OST backup/restore process is discussed in the Lustre manual, https://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.html#dbdoclet.backup_device
Using "dd" is fine, as long as the target device is as the source.
Principal Lustre Architect
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