On 03/31/2016 11:26 AM, Phil Stracchino wrote:
>> First, each user directory is an individual share or volume in ZFS
>> > parlance.  They're thin-provisioned volumes, on top of a storage pool. 
>> > Any export I do, be it NFS, iSCSI, CIFS, etc., would be done at that
>> > level, and not above.  There is no way to do a system-wide export of any
>> > kind, over any protocol.
> Aaaaaah, I see.  I didn't realize you were setting up your ZFS shares
> that way.

Yeah.  The ability to blow away an individual volume, quickly and
easily, was a big draw for us to use this approach.  Unfortunately, I'm
not exaggerating to say that we have users with file profiles that
consist of 35million files (or more) with average file sizes less than
10kb.  The user might be long-gone, and eligible for deletion, but it
takes forever to spider that filesystem, and occasionally causes
problems like directory cache thrashing, etc.

Believe me, I wish it weren't the case.  User education is about the
hardest part of my job.  Most of the time, the best we can do, is react
when things go badly.

-- 
Lloyd Brown
Systems Administrator
Fulton Supercomputing Lab
Brigham Young University
http://marylou.byu.edu


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