Details
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Question/Request
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Resolution: Not a Bug
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Minor
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None
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Lustre 2.5.2
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None
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15514
Description
We are currently facing the issue that on one of our file systems is running out of inodes on the MDT while we still have disk space on the OSTs. (Basically, bad estimates on average file size...) We are working on identifying why the average file size has gone down recently and also remove small files.
We're also looking into other ways to increase the available inodes on the MDT. Now that we are running lustre 2.5, adding additional MDTs is an option we are considering but this won't happen in the short term. We have spare capacity on the MDT backend storage system that we could add to the MDT LVM LV.
The question is, would increasing the disk size and a resize of the ldiskfs file system increase the number of inodes available? Is this something that has been done/tested? Is this a recommended way to increase the number of available inodes?
Would it be a better idea to take the space in the LVM VG, create a separate logical volume, format that as MDT and add that to the file system, moving a couple of directories there? It seems we would be fragmenting the file system doing this and would loose flexibility in placing our files, so I'd probably want to avoid this if growing the underlying MDT file system is a viable option.