Hello Francois, Friday, January 26, 2007, 4:09:43 PM, you wrote:
FD> On Fri, 2007-01-26 at 06:16 -0800, Jeffery Malloch wrote: >> Hi Folks, >> >> I am currently in the midst of setting up a completely new file server using >> a pretty well loaded Sun T2000 (8x1GHz, 16GB RAM) connected to an Engenio >> 6994 product (I work for LSI Logic so Engenio is a no brainer). I have >> configured a couple of zpools from Volume groups on the Engenio box - >> 1x2.5TB and 1x3.75TB. I then created sub zfs systems below that and set >> quotas and sharenfs'd them so that it appears that these "file systems" are >> dynamically shrinkable and growable. It looks very good... I can see the >> correct file system sizes on all types of machines (Linux 32/64bit and of >> course Solaris boxes) and if I resize the quota it's picked up in NFS right >> away. But I would be the first in our organization to use this in an >> enterprise system so I definitely have some concerns that I'm hoping someone >> here can address. >> >> 1. How stable is ZFS? The Engenio box is completely configured for RAID5 >> with hot spares FD> That partly defeats the purpose of ZFS. ZFS offers raid-z and raid-z2 FD> (double parity) with all the advantages of raid-5 or raid-6 but without FD> several of the raid-5 issues. It also has features that a raid-5 FD> controller could never do: ensure data integrity from the kernel to the FD> disk, and self correction. Not always true. Actually you can get much more performance for some workloads doing raid-5 in HW than raid-z. Also with some other entry level arrays there're limits on how much LUNs can be presented and you actually can't expose all disks each as a LUN due to the limit (yes, Sun's 3510). >> and write cache (8GB) has battery backup so I'm not too concerned from a >> hardware side. FD> Whereas the cache/battery backup is a requirement if you run raid-5, it FD> is not for zfs. Still it doesn't mean it won't help for some workloads. >> 2. Recommended config. FD> The most reliable setup is a JBOD + zfs. But if you have cache, on your I would argue this. No matter what you still get less reliable setup when using ZFS on top of simple JBOD than Symmetrix box. It's just that in many cases that simple JBOD can be good enough. FD> box, there might be some magic setup you have to do for that box, and FD> I'm sure somebody on the list will help you with that. I dont have an FD> Engenio. There's a workaround for Enginie devices. -- Best regards, Robert mailto:[EMAIL PROTECTED] http://milek.blogspot.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
