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Re: [Linux-cluster] A few GFS newbie questions: journals, etc



Jason Lanclos wrote:

You shouldn't even need CLVM if you don't intend to muddle with
partitions or cross-mount the file systems. You'll lose resizing, but
in doing so, your clients no longer need to be cluster participants.



CLVM is cool, but its pretty much useless until LVM2 actually implements pvresize or a pvextend.


What's wrong with vgextend?

One of the main advantages of having a SAN is being able to add space to a volume (LUN) Currently when we expand a volume on the san, we have to unmount the filesystem, rescan the LUNs, then run fdisk on that volume, delete the partition entry, and recreate it to use all the space.. then at that point we can run ext2online / gfs_grow to resize the filesystem.



A simpler method will be create a NEW LUN, scan it, pvcreate, add it to existing VG with vgextend, and extend your volume lvextend. At least you don't have to mess with existing partitions.

I would be VERY nice if pvresize / pvextend existed, that way one could expand the volume on the SAN,

My IBM SAN can't expand exisiting volume on the SAN. It's not like I need it though. The above solution works better.

rescan LUNs on each cluster member, run pvresize / pvextend, run lvextend and then gfs_grow and call it a day.



My only problem (for now) is I can't rescan LUNs without removing HBA modules (thus unmounting filesystems or restarting the server). If you can rescan LUNs online, it's a simple method of pvcreate, vgextend, lvextend, gfs_grow, and call it a day.

I mentioned this at the RedHat summit, and got a few puzzled looks,

I wonder why :-D

Regards,

Fajar


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