[lustre-discuss] Tools for backing up a ZFS MDT

[Mohr Jr, Richard Frank (Rick Mohr)]

This presentation from LUG 2017 might be useful for you:

http://cdn.opensfs.org/wp-content/uploads/2017/06/Wed06-CroweTom-lug17-ost_data_migration_using_ZFS.pdf

It shows how ZFS send/receive can be used to migrate data between OSTs.   I used it as a reference when I worked with another admin to migrate a MDT to new hardware.

--
Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences
http://www.nics.tennessee.edu

> On Mar 29, 2019, at 6:03 PM, Hans Henrik Happe <happe at nbi.dk> wrote:
> 
> Hi Kurt,
> 
> Haven't got much experience with the complete send/receive to a remote
> ZFS fs. However, I've created my own scripts for just sending to files.
> Also, I've moved an MDT from ashift=12 to ashift=9 with send/recv. It
> worked without any problems.
> 
> ZFS above 0.7.9 have issues together with dnodesize != legacy for receives:
> 
> https://github.com/zfsonlinux/zfs/issues/8458
> 
> I'll look into ZnapZend :-)
> 
> Cheers,
> Hans Henrik
> 
> On 25/03/2019 20.37, Kurt Strosahl wrote:
>> Good Afternoon,
>> 
>> 
>>      I've been working on a new lustre file system, now with ZFS on the
>> MDT (my current lustre file system uses ldiskfs).  One of the reasons
>> for this was the ability to use ZFS snapshots to backup the MDT, and I'm
>> wondering if anyone has experience with zfs backup tools like ZnapZend?
>> 
>> 
>> w/r,
>> 
>> Kurt J. Strosahl
>> System Administrator: Lustre, HPC
>> Scientific Computing Group, Thomas Jefferson National Accelerator Facility
>> 
>> 
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>> 
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