zfs code - Jun 2010 - VXFS to ZFS Quota

Hi
Currently I have 400+ users with quota set to 500MB limit. Currently the file
system is using veritas file system.

I am planning to migrate all these home directory to a new server with ZFS. How
can i migrate the quotas.

I can create 400+ file system for each users, 
but will this affect my system performance during the system boot up?
Is this recommanded or any alternate is available for this issue.
-- 
This message posted from opensolaris.org

On 18/06/10 10:29 PM, Sendil wrote:
> Hi
> Currently I have 400+ users with quota set to 500MB limit.
 > Currently the file system is using veritas file
system.
>
> I am planning to migrate all these home directory to a new
 > server with ZFS. How can i migrate the quotas.
>
> I can create 400+ file system for each users,
> but will this affect my system performance during the system boot up?
> Is this recommanded or any alternate is available for this issue.
Pretty sure this is covered in the manpages for zfs(1m) and
zpool(1m).

When I reboot the gate machine, which has around 2000 datasets
attached, the zfs import step takes about 2 minutes.

I''d use something like this:

for user in $LISTOFUSERS; do
	zfs create -o quota=500Mb -o mountpoint=/export/home/$user \
		poolname/$user
done



blinder:hook $ pfexec zfs create -o quota=500Mb -o 
mountpoint=/scratch/pkg/test1 sink/test1
blinder:hook $ zfs list sink/test1
NAME         USED  AVAIL  REFER  MOUNTPOINT
sink/test1    31K   500M    31K  /scratch/pkg/test1




James C. McPherson
--
Senior Software Engineer, Solaris
Oracle
http://www.jmcp.homeunix.com/blog

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On 18/06/10 14:35, James C. McPherson wrote:
> When I reboot the gate machine, which has around 2000 datasets
> attached, the zfs import step takes about 2 minutes.
Also, modern ZFS (Solaris 10 Update 8) supports Users/Groups quotas
directly, without creating a different dataset per user.

Beware, the quota checking is a bit "lazy", so a a user could go over
her quota for a while. Check documentation. Commands "zfs userquota",
"zfs groupquota", "zfs userspace", "zfs
groupspace".

"man zfs":

"""
         Enforcement of user quotas may  be  delayed  by  several
         seconds. This delay means that a user might exceed their
         quota before the system notices that they are over quota
         and  begins  to refuse additional writes with the EDQUOT
         error message . See the  zfs  userspace  subcommand  for
         more information.
"""

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