Hi I''m a little bit new with server but I''m going to dive in and build myself a server with opensolaris and zfs. Plan on going with 6-7x 1.5tb drives with raidz2. I''ve one question that I''d love to get an answere for. I''ve been reading everywhere it feels like and I see a lot of opensolaris+zfs+jbod. 1) Why should I have jbod on the controller card (well in my case on the motherboard since I''ll use some mobo with 8 sata connectors). Does not zfs take care of all that? Or can someone help me clear this up a bit for me? Thanks! -- This message posted from opensolaris.org
On Wed, Jul 1 at 23:24, Johan Kempe wrote:>Hi > > I''m a little bit new with server but I''m going to dive in and build > myself a server with opensolaris and zfs. Plan on going with 6-7x > 1.5tb drives with raidz2. > > I''ve one question that I''d love to get an answere for. I''ve been > reading everywhere it feels like and I see a lot of > opensolaris+zfs+jbod. > > 1) Why should I have jbod on the controller card (well in my case on > the motherboard since I''ll use some mobo with 8 sata connectors). > > Does not zfs take care of all that? Or can someone help me clear > this up a bit for me?If your controller supports JBOD, then ZFS has the easiest time managing and repairing failures because it has full control. On controllers where JBOD isn''t available, sometimes people can create single-disk RAID0/RAID1 vdevs and export those to ZFS. Alternately, it''s possible to create your zpool on top of some hardware RAID solution, but in those cases, it''s often difficult for ZFS to repair things if they go wrong. --eric -- Eric D. Mudama edmudama at mail.bounceswoosh.org
Thanks for the Info but I''d love to have it 100% clear, which it''s not for me yet. Do you make a raid with JBOD or does ZFS take advantage from commands available when the controller supports JBOD? Thanks! -- This message posted from opensolaris.org
I think you''re misunderstanding a little. JBOD = just a bunch of disks, it''s an acronym used as shorthand for cards that don''t have raid. So those standard sata connectors on your motherboard *are* JBOD :-) JBOD isn''t an extra technology ZFS needs, it''s just a way of saying it doesn''t need RAID and that standard controllers work just fine. -- This message posted from opensolaris.org
On Thu, 02 Jul 2009 01:45:28 PDT, Ross <no-reply at opensolaris.org> wrote:> I think you''re misunderstanding a little. > JBOD = just a bunch of disks, it''s an acronym > used as shorthand for cards that don''t have raid. > So those standard sata connectors on your > motherboard *are* JBOD :-)You''re right. There is a reason for this misunderstanding: a few years ago one could buy 1 TB external (USB) disks, which contained two physical 500 GB disks, probably concatenated or striped by the controller, which where presented to the outside world as one 1 TB disk. They used to call that a JBOD. Nowadays it''s more common to use the word JBOD to indicate a set of individually addressable disks indeed.> JBOD isn''t an extra technology ZFS needs, > it''s just a way of saying it doesn''t need > RAID and that standard controllers work > just fine.-- ( Kees Nuyt ) c[_]
some controllers still create jbods in the same way. A perfect example is any of the highpoint controllers. But yah, when we say JBOD we mean it as it was originally intended..just a bunch of discs On Thu, Jul 2, 2009 at 10:23 AM, Kees Nuyt <k.nuyt at zonnet.nl> wrote:> On Thu, 02 Jul 2009 01:45:28 PDT, Ross > <no-reply at opensolaris.org> wrote: > > > I think you''re misunderstanding a little. > > JBOD = just a bunch of disks, it''s an acronym > > used as shorthand for cards that don''t have raid. > > So those standard sata connectors on your > > motherboard *are* JBOD :-) > > You''re right. > There is a reason for this misunderstanding: a few years ago > one could buy 1 TB external (USB) disks, which contained two > physical 500 GB disks, probably concatenated or striped by > the controller, which where presented to the outside world > as one 1 TB disk. > > They used to call that a JBOD. > > Nowadays it''s more common to use the word JBOD to indicate a > set of individually addressable disks indeed. > > > JBOD isn''t an extra technology ZFS needs, > > it''s just a way of saying it doesn''t need > > RAID and that standard controllers work > > just fine. > -- > ( Kees Nuyt > ) > c[_] > _______________________________________________ > zfs-discuss mailing list > zfs-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20090702/f48b7d7e/attachment.html>