[prev in list] [next in list] [prev in thread] [next in thread] 

List:       zfs-discuss
Subject:    Re: [zfs-discuss] Questions
From:       Richard Elling <Richard.Elling () Sun ! COM>
Date:       2008-06-26 15:22:58
Message-ID: 4863B452.3060408 () sun ! com
[Download RAW message or body]

Mickae?l ABISROR wrote:
>>> Hi all,
>>>
>>> here are some questions about ZFS
>>>
>>> When accessing to RAW volumes under ZFS do we go through cache or 
>>> not? If yes can we disable it?
>>>       

I believe Zvols are uncached.

>>> They use Veritas QuickIO (ODM) and they want to compare with ZFS and 
>>> also ZFS with and without cache.
>>>       

Please see the discussions on "directio" at
http://www.solarisinternals.com//wiki/index.php?title=Category:ZFS
http://blogs.sun.com/bobs/entry/one_i_o_two_i
http://blogs.sun.com/bobs/entry/oracle_i_o_supply_and
http://www.solarisinternals.com/wiki/index.php/Direct_I/O


>>> Do we have some benchmark or figures about the compression CPU 
>>> overhead with ZFS? and for Checksumming?
>>>
>>> I've seen 1ghz/500mbytes of data for checksumming but it seems to me 
>>> that's huge...
>>>       

I believe you mean 1 GHz/500 MBytes/s which is reasonable.
That is a rather substantial bandwidth for database.

>> What about also the update of ZFS? Do we update with packages, 
>> patches, kernel patches or Solaris release?
>>     

Yes.  The exact mix depends on your OS and release.
 -- richard

_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[prev in list] [next in list] [prev in thread] [next in thread]