we were draining pools with 1 TB disks this spring with same rate of ~1
TB/day. We also needed to restart draining several times.
Elena
____________________________________________________________________________
Dr Elena Korolkova
Email: [log in to unmask]
Tel.: +44 (0)114 2223553
Fax: +44 (0)114 2223555
Department of Physics and Astronomy
University of Sheffield
Sheffield, S3 7RH, United Kingdom
On Tue, 1 Jun 2010, Matt Doidge wrote:
> This is about the rate we were seeing, we were draining a single
> filesystem at a rate that appeared to be just shy of 1TB/day. Luckily
> for us only 8TB of the 36 TB of space on that pool were being used!
>
> cheers,
> Matt
>
> On 1 June 2010 16:36, Sam Skipsey <[log in to unmask]> wrote:
>> Erm. I think I was managing on the order of 1T * 5 = 5T a day (draining 5
>> filesystems in parallel). It would actually have been more than this if I
>> was doing complete drains, but the drains were partial, and so there's dead
>> time in this estimate when drains completed late at night.
>> In principle, I could do more, but I didn't want to overstress the storage
>> with other jobs using it as well.
>> Sam
>>
>> On 1 June 2010 16:32, Peter Love <[log in to unmask]> wrote:
>>>
>>> Can you quantify 'pretty quickly' ?
>>>
>>> On 1 June 2010 13:48, Sam Skipsey <[log in to unmask]> wrote:
>>>> That said, the dpm-drain in 1.7.3 seems to be pretty good when I've been
>>>> using it. (Although, clearly a parallel, (targeted?) drain would be
>>>> better,
>>>> I can drain one of our old disk pools entirely pretty quickly without
>>>> it.)
>>>> Sam
>>>>
>>>> On 1 June 2010 13:42, Wahid Bhimji <[log in to unmask]> wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> Peter asked about dpm-drain improvements in the dteam+sites mtg. So I
>>>>> just
>>>>> thought I would get a clarification / update from JP and post it here:
>>>>>
>>>>> Indeed the parallel dpm-drain was not released in 1.7.4 because Michel
>>>>> Jouvin reported many hangs in testing and the rfcp dpm-replicate has
>>>>> not yet
>>>>> been implemented.
>>>>> So, as I thought in the meeting, that the improvements are not yet
>>>>> available in any version pre-release or otherwise - but we should get a
>>>>> preview as soon as they are.
>>>>>
>>>>> Cheers
>>>>>
>>>>> Wahid
>>>>> --
>>>>> The University of Edinburgh is a charitable body, registered in
>>>>> Scotland, with registration number SC005336.
>>>>
>>>>
>>
>>
>
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