Re: [CentOS] LVM + XFS + external log + snapshots - SOLVED
On Mon, Jun 24, 2013 at 07:49:21PM -0700, aurfalien wrote: ... So this worked; truncate --size=2G logfile losetup /dev/loop0 logfile mount /dev/vg_anette_data/datasnapshot /snapshot -o logdev=/dev/loop0,nouuid,ro Freezing the fs looks to make the log zero. So assigning any device/file for the external log would work. My mistake was not making the log dev an LVM. However I don't if a log on an LVM would have worked anyways. At any rate, HTH some one else. Thanks for the follow-up, and worth a wiki entry, imho Cheers, Tru -- Tru Huynh (mirrors, CentOS i386/x86_64 Package Maintenance) http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xBEFA581B pgppfoB8xf6Lx.pgp Description: PGP signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] LVM + XFS + external log + snapshots - SOLVED
On 06/24/2013 07:49 PM, aurfalien wrote: Freezing the fs looks to make the log zero. So assigning any device/file for the external log would work. My mistake was not making the log dev an LVM. However I don't if a log on an LVM would have worked anyways. It wouldn't work. If you snapshot a filesystem (XFS or Ext4) with an external journal, you'll need to create a new one or modify the snapshot to specify no journal. I've started a project to handle these things automatically and make it easier for everyone to make backups using snapshots. Initial work is here, and I'll be picking it up again when I'm back from Prague. https://bitbucket.org/gordonmessmer/dragonsdawn-snapshot I'll be adding support for XFS, NetApp, and btrfs soon. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] LVM + XFS + external log + snapshots - SOLVED
On Jun 25, 2013, at 6:02 AM, Gordon Messmer wrote: On 06/24/2013 07:49 PM, aurfalien wrote: Freezing the fs looks to make the log zero. So assigning any device/file for the external log would work. My mistake was not making the log dev an LVM. However I don't if a log on an LVM would have worked anyways. It wouldn't work. If you snapshot a filesystem (XFS or Ext4) with an external journal, you'll need to create a new one or modify the snapshot to specify no journal. Ah, good to know. So the method I found, actually one suggested to me from the XFS list was the only solution. I've started a project to handle these things automatically and make it easier for everyone to make backups using snapshots. Initial work is here, and I'll be picking it up again when I'm back from Prague. https://bitbucket.org/gordonmessmer/dragonsdawn-snapshot I'll be adding support for XFS, NetApp, and btrfs soon. Nice info man, thank you very much. - aurf ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] LVM + XFS + external log + snapshots - SOLVED
On Jun 21, 2013, at 2:58 PM, Joseph L. Casale wrote: So I have an XFS file system within LVM which has an external log. A snapshot volume is created w/o issue; But when i try to mount the file system; mount: /dev/mapper/vg_spock_data-datasnapshot already mounted or /snapshot busy So the filesystem was built requiring an external log device? Let me guess, the original block device is still mounted and accessing its log device? ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos So this worked; truncate --size=2G logfile losetup /dev/loop0 logfile mount /dev/vg_anette_data/datasnapshot /snapshot -o logdev=/dev/loop0,nouuid,ro Freezing the fs looks to make the log zero. So assigning any device/file for the external log would work. My mistake was not making the log dev an LVM. However I don't if a log on an LVM would have worked anyways. At any rate, HTH some one else. - aurf ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
