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Frequently Asked Questions
Why have some of my files been moved from disk to tape?
Once a filesystem is more than 95% full, DMF selects some files to store only on tape. DMF selects files by considering their size and the time
since they were last accessed. Very small files are generally always retained on disk as it tends to be very inefficient writing them to tape. DMF, by
default, will select the files with the oldest access time to be stored on tape only first. This should mean that any files you're currently working on
will be retained on disk but those you've not accessed for a few weeks are more likely to be on tape. Note that DMF selects files individually rather than a
complete directory at a time.
Can I see which files are on disk and which are on tape?
Yes. On the cluster head node (spectrum) you can use the command
hsmstat filenames
which will display whether a file is
REG - on disk only
DUL - on disk and also on tape
OFL - on tape only
There are some other states as well. The hsmstat command is actually a wrapper script to the DMF client command dmattr which has its own man page containing further information.
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