Re: Request for information

[Geoffrey Letessier <geoffrey.letessier@xxxxxxx>]

Unfortunately, we have very different usages and thus file sizes (from hundreds of KB to tens of GB, depending on software and users).

One more time, thank you for your help and advices.

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 12:44, Mathieu Chateau <mathieu.chateau@xxxxxxx> a écrit :

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@xxxxxxx>:

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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