Gluster users - Jul 2015 - Request for information

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

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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://www.gluster.org/pipermail/gluster-users/attachments/20150712/73d0c987/attachment.html>