Hello Jim,

Wednesday, December 6, 2006, 3:28:53 PM, you wrote:

JD> We have two aging Netapp filers and can't afford to buy new Netapp gear,
JD> so we've been looking with a lot of interest at building NFS fileservers
JD> running ZFS as a possible future approach.  Two issues have come up in the
JD> discussion

JD> - Adding new disks to a RAID-Z pool (Netapps handle adding new disks very
JD> nicely).  Mirroring is an alternative, but when you're on a tight budget
JD> losing N/2 disk capacity is painful.

Actually you can add another raid-z group to the pool.
I belive it's the same what NetApp is doing (instead of actually
growing raid group).

JD> - The default scheme of one filesystem per user runs into problems with
JD> linux NFS clients; on one linux system, with 1300 logins, we already have
JD> to do symlinks with amd because linux systems can't mount more than about
JD> 255 filesystems at once.  We can of course just have one filesystem 
JD> exported, and make /home/student a subdirectory of that, but then we run
JD> into problems with quotas -- and on an undergraduate fileserver, quotas
JD> aren't optional!

It can with 2.6 kernels.
However there're other problems we we ended-up with limit at around
700.

-- 
Best regards,
 Robert                            mailto:[EMAIL PROTECTED]
                                       http://milek.blogspot.com

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