[Gluster-users] Request for information

Mathieu Chateau
Sun, 12 Jul 2015 10:44:53 -0000

Yes, after it depend on your average file size

Cordialement,
Mathieu CHATEAU
http://www.lotp.fr

2015-07-12 12:43 GMT+02:00 Geoffrey Letessier <geoffrey.letessier at
cnrs.fr>:

> Hello Mathieu,
>
> Thank you for replying.
> What do you think about reconstructing every RAID VD with 128KB stripe
> size? Indeed, with this value, if one day i decide to use stripped volume,
> 128KB is the common value of logical stripe size.
>
> Thanks again,
> Have a nice end-of-weekend
> Amicalement,
> Geoffrey
> ------------------------------------------------------
> Geoffrey Letessier
> Responsable informatique & ing?nieur syst?me
> UPR 9080 - CNRS - Laboratoire de Biochimie Th?orique
> Institut de Biologie Physico-Chimique
> 13, rue Pierre et Marie Curie - 75005 Paris
> Tel: 01 58 41 50 93 - eMail: geoffrey.letessier at ibpc.fr
>
> Le 12 juil. 2015 ? 11:49, Mathieu Chateau <mathieu.chateau at
lotp.fr> a
> ?crit :
>
> Hello,
>
> If these 4 virtual drives are then put together to get one big volume, it
> will goes as the slower one.
> I would put the LSI to 64K to get same size everywhere anyway, even if
> it's transparent/hidden from an OS perspective
>
>
> Cordialement,
> Mathieu CHATEAU
> http://www.lotp.fr
>
> 2015-07-12 11:16 GMT+02:00 Geoffrey Letessier <geoffrey.letessier at
cnrs.fr>
> :
>
>> Dear all,
>>
>> Because I?m currently reconstructing all my GlusterFS volumes, I just
>> noticed that all of my RAID virtual drives did not necessarily have the
>> same stripe size and I wonder whether it would be better to
>> reconstruct/rebuild these virtual drives with the same stripe size ...
What
>> do you recommend ?
>>
>> Actually, 2 virtual drives of 4 have a stripe size set to 64KB (Dell
Perc
>> H8xx RAID controller default settings) and the 2 left are set to 256KB
(LSI
>> MegaRAID 9286-8e default settings). With iozone tests, i notice Dell
Perc
>> VD have better results than LSI ones. (~1.3-4GBs vs ~1.2GBs) and I
wonder
>> if these parameters are not in cause...
>>
>> It?s very urgent for me to know what i have to do because I need to
>> reconstruct and set all my volumes and back transfert roughly 40TBs in
>> distributed and replicated volumes as quickly as possible?
>>
>> Thanks by advance,
>> Geoffrey
>> ------------------------------------------------------
>> Geoffrey Letessier
>> Responsable informatique & ing?nieur syst?me
>> UPR 9080 - CNRS - Laboratoire de Biochimie Th?orique
>> Institut de Biologie Physico-Chimique
>> 13, rue Pierre et Marie Curie - 75005 Paris
>> Tel: 01 58 41 50 93 - eMail: geoffrey.letessier at ibpc.fr
>>
>> _______________________________________________
>> Gluster-users mailing list
>> Gluster-users at gluster.org
>> http://www.gluster.org/mailman/listinfo/gluster-users
>>
>
>
>
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