Re: [HPDD-discuss] Lustre Disk to Disk MDS Backup Question
-----Original Message-----
From: Dilger, Andreas [mailto:andreas.dilger@intel.com]
Sent: Tuesday, April 09, 2013 5:45 PM
To: Kit Westneat; Kumar, Amit
Cc: hpdd-discuss(a)lists.01.org
Subject: Re: [HPDD-discuss] Lustre Disk to Disk MDS Backup Question
On 2013/09/04 9:47 AM, "Kit Westneat" <kwestneat(a)ddn.com> wrote:
You should do that in order to get a clean image. If you don't,
then
you are more likely to get an inconsistent image. Of course, an
inconsistent image is better than no image, but ideally you'd want to get a clean one.
>Or, since this is a device mapper device, you can create a
snapshot, and then use "dd" from the MDS snapshot (which should be consistent).
That's what I do for my MDS backups, and it >>has saved me a couple of times.
>
>Cheers, Andreas
Dear Andreas,
This is interesting. Some more basic questions to help me understand:
So what snapshot tool do you use? Do you create a snapshot of production MDS(mdt, &
mgs) combined/split to a device mapper drive or on the same MDS device,
If snapshot is created onto a different device is it: (1) an ext3 device? (2) ??
Once the snapshot is created, you dd from snapshot to another device( which is again what
type of device: ext3 /lustre?)
Sorry if I am asking dumb questions.
Thank you for your input.
Amit