On Jun 28, 2011, at 4:43 PM, Julie Ashworth <julie.ashworth@berkeley.edu> wrote:

-----------------------------------------
    Filesystem blocks      quota
/dev/mapper/fs   6635021816* 4294967300

    Filesystem blocks      quota
    server:/fs 2340054520* 4
-----------------------------------------
    Filesystem blocks      quota
/dev/mapper/fs   6635021816* 4294967296

    <NONE>
-----------------------------------------
    Filesystem blocks      quota
/dev/mapper/fs   6635021816* 4294967292

    Filesystem blocks      quota
    server:/fs 2340054520 4294967292
-----------------------------------------

I think it's interesting that the second to last instance
didn't report any quota for this user on the client. Of
course, increasing or decreasing the quota produced output.

Any insight?

From this it appears you're hitting a 32-bit counter limit.

Are these clients 32-bit or 64-bit?

-Ross