ZFS - overfilled pool Post: 302626411

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Operating Systems Solaris ZFS - overfilled pool Post 302626411 by RychnD on Thursday 19th of April 2012 09:37:11 AM

04-19-2012

Registered User

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

RychnD

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zdb

zdb(8)							  System Administration Commands						    zdb(8)

NAME

       zdb - ZFS debugger

SYNOPSIS

       zdb pool

DESCRIPTION

       The  zdb command is used by support engineers to diagnose failures and gather statistics. Since the ZFS file system is always consistent on
       disk and is self-repairing, zdb should only be run under the direction by a support engineer.

       If no arguments are specified, zdb, performs basic consistency checks on  the  pool  and  associated  datasets,	and  report  any  problems
       detected.

       Any options supported by this command are internal to Sun and subject to change at any time.

EXIT STATUS

       The following exit values are returned:

       0    The pool is consistent.

       1    An error was detected.

       2    Invalid command line options were specified.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWzfsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       zfs(8), zpool(8), attributes(5)

SunOS 5.11							    31 Oct 2005 							    zdb(8)

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