To me it seems to solve all the stupid problems with md/lvm/ext3. Just as I am writing this, the users of my system are waiting for a "resize2fs" to complete. With file systems at several TB on a rather slow MSA 1500 this can take hours. SLES10 has a command for doing the resize online, but every time I try, it complaints about an inode or data block in the wrong location or something like that. (I have not tried lately, so I don't remember the exact error message.) Being able to create a mirror of something that is not on an MD-device sounds great, especially with lvm where a filesystem spans multiple volumes and is mixed up with lots of other filesystems that don't need mirroring. pvmove offers some of the functionality, but has caused some horrible system crashes, and I'm only allowed to use it during the night after the backup has completed. One of the reasons I was allowed to replace HPUX as our NFS-server was that I told management that Linux was at least equally flexible... :(
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