Re: Request for information

Geoffrey Letessier <geoffrey.letessier@xxxxxxx> · Sun, 12 Jul 2015 12:43:30 +0200

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 & ingénieur système
UPR 9080 - CNRS - Laboratoire de Biochimie Théorique
Institut de Biologie Physico-Chimique
13, rue Pierre et Marie Curie - 75005 Paris
Tel: 01 58 41 50 93 - eMail: geoffrey.letessier@xxxxxxx

Le 12 juil. 2015 à 11:49, Mathieu Chateau <mathieu.chateau@xxxxxxx> a écrit :

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@xxxxxxx>:
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 & ingénieur système

UPR 9080 - CNRS - Laboratoire de Biochimie Théorique

Institut de Biologie Physico-Chimique

13, rue Pierre et Marie Curie - 75005 Paris

Tel: 01 58 41 50 93 - eMail: geoffrey.letessier@xxxxxxx

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