[lustre-discuss] migrating mgs and mdt

[Kulyavtsev, Alex Ivanovich]

See following sections in lustre manual :

18.2.  Backing Up and Restoring an MDT or OST (ldiskfs Device Level)
18.3.  Backing Up an OST or MDT (Backend File System Level)

Alex.


From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on behalf of Lana Deere <lana.deere at gmail.com>
Date: Monday, December 9, 2024 at 14:14
To: lustre-discuss at lists.lustre.org <lustre-discuss at lists.lustre.org>
Subject: [lustre-discuss] migrating mgs and mdt
I am managing a Lustre 2. 12. 6 system where I have just discovered that the MGS and MDTs are on single disks rather than RAIDed drives. /dev/sda5 on /mnt/lustre_mgs type lustre (ro,svname=MGS,nosvc,mgs,osd=osd-ldiskfs,. . . ) /dev/sdc1 on /mnt/lustre_mdt_abc
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I am managing a Lustre 2.12.6 system where I have just discovered that the MGS and MDTs are on single disks rather than RAIDed drives.
/dev/sda5 on /mnt/lustre_mgs type lustre (ro,svname=MGS,nosvc,mgs,osd=osd-ldiskfs,...)
/dev/sdc1 on /mnt/lustre_mdt_abc type lustre (ro,svname=lstr_abc-MDT0000,mgsnode=10.58.255.254 at o2ib,osd=osd-ldiskfs,...)
/dev/sdb1 on /mnt/lustre_mdt_def type lustre (ro,svname=lstr_def-MDT0000,mgsnode=10.58.255.254 at o2ib,osd=osd-ldiskfs,...)

Is there any way to migrate those three metadata partitions to other partitions which would presumably be located on RAIDed drives?  For example, would it work to set up the new RAIDed drives and use dd to clone the partitions into partitions on the RAID?

.. Lana (lana.deere at gmail.com<mailto:lana.deere at gmail.com>)
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