On Wed, Dec 06, 2006 at 07:28:53AM -0700, Jim Davis wrote:
> We have two aging Netapp filers and can't afford to buy new Netapp gear,
> so we've been looking with a lot of interest at building NFS fileservers
> running ZFS as a possible future approach.  Two issues have come up in the
> discussion
>
> - Adding new disks to a RAID-Z pool (Netapps handle adding new disks very
> nicely).  Mirroring is an alternative, but when you're on a tight budget
> losing N/2 disk capacity is painful.
>
> - The default scheme of one filesystem per user runs into problems with
> linux NFS clients; on one linux system, with 1300 logins, we already have
> to do symlinks with amd because linux systems can't mount more than about
> 255 filesystems at once.  We can of course just have one filesystem
> exported, and make /home/student a subdirectory of that, but then we run
> into problems with quotas -- and on an undergraduate fileserver, quotas
> aren't optional!
>

well, if the mount limitation is imposed by the linux kernel you might
consider trying running linux in zone on solaris (via BrandZ).  Since
BrandZ allows you to execute linux programs on a solaris kernel you
shoudn't have a problem with limits imposed by the linux kernel.
brandz currently ships in an solaris express (or solaris express
community release) build snv_49 or later.

you can find more info on brandz here:
        http://opensolaris.org/os/community/brandz/

ed
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