>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. >Since no one is focusing on enabling default user/group quota now, the >temporarily remedy could be a script which traverse all the users/groups >in the directory tree. Tough it is not so decent. >The largest market for user/group quotas is .edu. But they represent only a >small market >when measured by $. >There are also many corner cases in this problem space. One might pine for the >days of >VMS and its file resource management features, those features don't scale well >to company- >wide LDAP and thousands of file systems. My understanding is the quota management is needed as long as zfs storage is used in NAS way(shared by multi-users). >So, for now, the fastest method to solve the problem might be to script some >walkers. Yes. That is ture. Thanks. Fred
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