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

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