On Apr 29, 2012, at 7:59 PM, Fred Liu wrote: > > >On Apr 26, 2012, at 12:27 AM, Fred Liu wrote: > > >“zfs 'userused@' properties” and “'zfs userspace' command” are good enough > >to gather usage statistics. > >I think I mix that with NetApp. If my memory is correct, we have to set > >quotas to get usage statistics under DataOnTAP. > >Further, if we can add an ILM-like feature to poll the time-related > >info(atime,mtime,ctime,etc) with that statistic from ZFS, that will be > >really cool. > > >In general, file-based ILM has limitations that cause all sorts of issues > >for things like > >operating systems, where files might only be needed infrequently, but when > >they are > >needed, they are needed "right now" > > >Have you looked at "zfs diff" for changed files? > > Here “ILM-like feature”, I mean we know how the data is > distributed by time per pool/filesystem like how many data are > modified/accessed > before mm/dd/yyyy. And we don’t need to do the actual storage-tying > operations immediately(moving the infrequently-used data to tie-2 > storage). The time-related usage statistics are very useful reference > for us. > “zfs diff” will show the delta but not come with the time info.
The time is the creation time of the snapshots. -- richard -- ZFS Performance and Training richard.ell...@richardelling.com +1-760-896-4422
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