[Gluster-users] Request for information

Mathieu Chateau mathieu.chateau at lotp.fr
Sun Jul 12 09:49:04 UTC 2015


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


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 & 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 at ibpc.fr
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