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Full Discussion: ZFS - overfilled pool
Operating Systems Solaris ZFS - overfilled pool Post 302626411 by RychnD on Thursday 19th of April 2012 09:37:11 AM
Old 04-19-2012
ZFS - overfilled pool
installed Solaris 11 Express on my server machine a while ago. I created a Z2 RAID over five HDDs and created a few ZFS filesystems on it.

Once I (unintentionally) managed to fill the pool completely with data and (to my surprise) the filesystems stopped working - I could not read/delete any data and when I unmounted the pool, I could not even mount it again.

I've heard that this is a standard behavior of ZFS filesystems and that the correct way to avoid such problems in future is not to use the full capacity of the pool.

Now I'm thinking about creating quotas on my filesystems (as they describe in [this article](ZFS: Set or create a filesystem quota)), but I am wondering if that is enough.

I have got a tree hiearchy of filesystems on the pool, e.g. something like this (pool is the name of the zpool and also the name of the root filesystem on the pool):

/pool
/pool/svn
/pool/home
...

Is it OK to just set a quota on "pool" (as they should propagate to all sub-filesystems)? I mean, is this enough to prevent such event to happen again? For instance, would it prevent me to make a new fs snapshot should the quota be overrun?

How much space should I reserve, e.g. make unavailable (I read somewhere that it is a good practise to use only about 80% of the pool capacity)?

Finally, is there a better/more suitable solution to my original problem than setting the quota on fs?

Thank you very much for your advice.
Dusan
 

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LEARN ABOUT REDHAT

setquota

SETQUOTA(8)						      System Manager's Manual						       SETQUOTA(8)

NAME

       setquota - set disk quotas

SYNOPSIS

       /usr/sbin/setquota [ -r ] [ -u | -g ] [ -F quotaformat ] name block-softlimit block-hardlimit inode-softlimit inode-hardlimit -a | filesys-
       tem...

       /usr/sbin/setquota [ -r ] [ -u | -g ] [ -F quotaformat ] [ -p protoname ] name -a | filesystem...

       /usr/sbin/setquota -t [ -u | -g ] [ -F quotaformat ] block-grace inode-grace -a | filesystem...

DESCRIPTION

       setquota is a command line quota editor.  The filesystem, user/group name and new quotas for this filesystem can be specified on  the  com-
       mand line.

       -r     Edit also remote quota use rpc.rquotad on remote server to set quota.

       -F quotaformat
	      Perform setting for specified format (ie. don't perform format autodetection).  Possible format names are: vfsold (version 1 quota),
	      vfsv0 (version 2 quota), rpc (quota over NFS), xfs (quota on XFS filesystem)

       -u     Set user quotas for named user. This is the default.

       -g     Set group quotas for named group.

       -p protoname
	      Use quota settings of user or group protoname to set the quota for the named user or group.

       -t     Set grace times for users/groups. Times block-grace and inode-grace are specified in seconds.

       -a     Go through all filesystems with quota in /etc/mtab and perform setting.

       To disable a quota, set the coresponding parameter to 0. To change quotas for several filesystems, invoke once for each filesystem.

       Only the super-user may edit quotas.

FILES

       aquota.user or aquota.group
			   quota file at the filesystem root (version 2 quota, non-XFS filesystems)
       quota.user or quota.group
			   quota file at the filesystem root (version 1 quota, non-XFS filesystems)
       /etc/mtab	   mounted filesystem table

SEE ALSO

       edquota(8), quota(1), quotactl(2), quotacheck(8), quotaon(8), repquota(8)

																       SETQUOTA(8)
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