On Jan 16, 2012, at 8:31 AM, Peter Cock wrote:

> On Mon, Jan 16, 2012 at 1:20 PM, graham etherington (TSL)
> <graham.ethering...@sainsbury-laboratory.ac.uk> wrote:
>> Hi Nate,
>> We are getting quite large discrepancies between 'Size on disk' and
>> 'Usage' numbers, so I've run the scripts/set_user_disk_usage.py script.
>> When I run it, some of the 'old usage' numbers are negative numbers, e.g.
>> User1 old usage: -226417886261, new usage: 139894688577
>> User2 old usage: 263698720473, new usage: 68974834617
>> User3 old usage: 397108490587, new usage: 406950046043
>> User4 old usage: -57441684074, new usage: 7536071906
>> 
>> This seems a little strange (how can a user have a 'minus' usage?). Is
>> there an explanation for this?
> 
> Negative numbers here are probably a sign of integer overflow
> (something too large for a signed 32 bit integer would be my
> guess).

Possible, although I would guess that set_user_disk_usage.py was never run 
after the disk accounting was added (harmless, since it can be run at any 
time).  Users who already had a bunch of data then started at '0', deleted a 
bunch of data, and end up with negative usage.

--nate

> 
> Peter


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