Re: [HPDD-discuss] Lustre Disk to Disk MDS Backup Question

On 2013/09/04 9:47 AM, "Kit Westneat" <kwestneat(a)ddn.com&gt; 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 >On 04/09/2013 11:33 AM, Kumar, Amit wrote: >> Hi Kit >> >> This is good to know. Do I still need to shutdown the lustre FS? And >>Umount the devices? >> >> Thank you >> Amit >> >> Sent from my iPhone >> >> On Apr 9, 2013, at 10:27 AM, "Kit Westneat" >><kwestneat@ddn.com<mailto:kwestneat@ddn.com>> wrote: >> >> Hi Amit, >> >> If you are doing a disk to disk backup, and the size of the backup disk >>is >= the main disk, I would just use dd and not worry about formatting >>the disk beforehand. The dd will replicate the filesystem structure >>exactly, so there's no need to mkfs. I would do something like 'dd >>if=/dev/dm-0 of=/dev/dm-2 bs=1M'. >> >> - Kit >> >> On 04/09/2013 02:40 AM, Kumar, Amit wrote: >> I forgot to paste the link I referenced to perform backup: here it is: >>http://wiki.lustre.org/manual/LustreManual18_HTML/BackupAndRestore.html >> Any thoughts on this will be very helpful! >> Thank you, >> Amit >> >> From: &gt;&gt;hpdd-discuss-bounces(a)lists.01.org&lt;mailto: hpdd-discuss-bounces(a)lists.01.or >>g> [mailto:hpdd-discuss-bounces@lists.01.org] On Behalf Of Kumar, Amit >> Sent: Monday, April 08, 2013 12:47 PM >> To: HPDD-discuss@lists.01.org<mailto:HPDD-discuss@lists.01.org> >>(HPDD-discuss@ml01.01.org<mailto:HPDD-discuss@ml01.01.org>) >> Subject: [HPDD-discuss] Lustre Disk to Disk MDS Backup Question >> >> Dear All, >> >> ³Version 1.8² >> >> We have both MGS & MDT mounted on two different block devices. >> Now I would like to perform a disk to disk backup of both of these >>block devices to another set of block devices. >> >> Although this link tells me how to perform that. There are some missing >>things that I want to understand before I can perform this backup >> >> We have two devices /dev/dm-1 & /dev/dm-0 mounted as /mgs and /mdt >>respectively. >> >> Now I have two more devices /dev/dm-2 & /dev/dm-3 which I want to mount >>it as /mgs-backup and /mdt-backup and then perform the disk to disk >>backup. Because we are not backing up any of the metadata right now. >> >> Here is where I get lost: when I want to make the lustre file system it >>asked me if the device is going to be an mgs or mdt or it will be >>combined. Now that I already have an /mgs and /mdt partition on this >>node what will happen if I make new block device to be an mgs and mdt >>partition, will this conflict with the existing ?????? >> Or can I just make the new devices just an ext3 partition and still be >>able to make a disk to disk copy of meta data that I can restore when >>needed. >> Cheers, Andreas -- Andreas Dilger Lustre Software Architect Intel High Performance Data Division _______________________________________________ HPDD-discuss mailing list HPDD-discuss(a)lists.01.org https://lists.01.org/mailman/listinfo/hpdd-discuss