Another question...We''re building a ZFS NAS/SAN out of the following JBODs we already own: 2x 15x 1000GB SATA3x 15x 750GB SATA2x 12x 600GB SAS 15K4x 15x 300GB SAS 15K That''s a lot of spindles we''d like to benefit from, but our assumption is that we should split these in two separate pools, one for SATA drives and one for SAS 15K drives. Are we right? Thanks -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100701/33c781d8/attachment.html>
Sorry for the formatting, that''s 2x 15x 1000GB SATA 3x 15x 750GB SATA 2x 12x 600GB SAS 15K 4x 15x 300GB SAS 15K -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100701/d3f26cda/attachment.html>
----- Original Message -----> Another question... > We''re building a ZFS NAS/SAN out of the following JBODs we already > own: > > > 2x 15x 1000GB SATA > 3x 15x 750GB SATA > 2x 12x 600GB SAS 15K > 4x 15x 300GB SAS 15K > > > That''s a lot of spindles we''d like to benefit from, but our assumption > is that we should split these in two separate pools, one for SATA > drives and one for SAS 15K drives. Are we right?As the 15k drives are faster seek-wise (and possibly faster for linear I/O), you may want to separate them into different VDEVs or even pools, but then, it''s quite impossible to give a "correct" answer unless knowing what it''s going to be used for. Also, using 10+ drives in a single VDEV is not really recommended - use fewer drives, loose more space, but get a faster system with fewer drives in each VDEV. 15x 750GB SATA drives in a single VDEV will give you about 120 IOPS for the whole VDEV at most. Using smaller VDEVs will help speeding up things and will give you better protection against faulty drives (silent or noisy). Once more - see http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 roy at karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et element?rt imperativ for alle pedagoger ? unng? eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer p? norsk.
> As the 15k drives are faster seek-wise (and possibly faster for linear I/O), you may want to separate them into different VDEVs or even pools, but then, it''s quite impossible to give a "correct" answer unless knowing what it''s going to be used for.Mostly database duty.> > Also, using 10+ drives in a single VDEV is not really recommended - use fewer drives, loose more space, but get a faster system with fewer drives in each VDEV. 15x 750GB SATA drives in a single VDEV will give you about 120 IOPS for the whole VDEV at most. Using smaller VDEVs will help speeding up things and will give you better protection against faulty drives (silent or noisy). Once more - see http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_GuideWith that much space we can afford mirroring everything. We''ll put every disk in pair across separate JBODs and controllers.Thanks a lot!-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100701/d8ad3410/attachment.html>
----- Original Message -----> > As the 15k drives are faster seek-wise (and possibly faster for > > linear I/O), you may want to separate them into different VDEVs or > > even pools, but then, it''s quite impossible to give a "correct" > > answer unless knowing what it''s going to be used for. > > > Mostly database duty.Then use the 15k drives in a striped mirror - they''ll perform quite a bit better that way :p Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 roy at karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et element?rt imperativ for alle pedagoger ? unng? eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer p? norsk.