On Sep 19, 2018, at 18:49, Mohr Jr, Richard Frank (Rick Mohr) <rm...@utk.edu> wrote: > > Has anyone had recent experience resizing a ldiskfs-backed MDT using the > resize2fs tool? We may be purchasing a small lustre file system in the near > future with the expectation that it could grow considerably over time. Since > we don’t have a clear idea of how many inodes we might need in the future, I > wanted to consider options that would allow us to potentially expand the MDT > capacity over time. (Of course, using ZFS would allow us to easily expand > capacity, but I do have some concern about metadata performance. Also, we > will likely need to use project quotas which as far I remember is not > available for ZFS at the moment .)
Rick, I've used resize2fs to resize my MDT in the past, but this was for relatively small resize increments, and I haven't done it recently. Note that for Lustre MDT/OST mounts, you can't resize the filesystem directly while mounted. It is possible to *also* mount the filesystem as type ldiskfs to run the resize2fs command (basically to give it a place to call the resize ioctl()), but YMMV. It is always a good idea to have an MDT backup (every few days if possible) since it is a relatively small amount of space to store an MDT backup, which may avoid a large amount of data loss/restore. Even a "dd" backup of the live MDT is likely usable after e2fsck, and better than a broken MDT if something goes wrong. Cheers, Andreas --- Andreas Dilger Principal Lustre Architect Whamcloud
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