Hi There,
One of my partners asked the question w.r.t. Disk Pool overhead for the
7000 series.
Adam Leventhal put that it was very small (1/64) see below..
Do we have any further info regarding this?
Thanks,
-eric :)
-------- Original Message --------
Subject: Re: [Fwd: RE: Disk Pool overhead]
Date: Mon, 09 Feb 2009 09:34:28 -0800
From: Adam Leventhal <ahl at eng.sun.com>
To: Eric Frank <Eric.Frank at Sun.COM>
References: <49905BEB.1000200 at sun.com>
Hey Eric,
I don''t think so. You should ask on zfs-discuss at opensolaris.org.
Adam
On Mon, Feb 09, 2009 at 11:38:03AM -0500, Eric Frank
wrote:> Hi Adam,
>
> Is the 1/64th number for ZFS published anywhere else besides your blog?
>
> thanks,
> -eric :)
>
> -------- Original Message --------
> Subject: RE: Disk Pool overhead
> Date: Fri, 06 Feb 2009 12:58:43 -0500
> From: Tim Brown <timb at conres.com>
> To: Eric.Frank at Sun.COM
> CC: Ward.Eldred at Sun.COM, Gary Losito <glosito at conres.com>
> References: <6E49BCBB8A5DEB43BD9174E6A880159003A80C73 at
20MAIL.cri_corp.com>
> <498C2D63.2020005 at sun.com>
>
>
>
> Eric,
>
> is that a true number 1/64^th ?
>
>
>
> As - is it in a published Sun manual rather than a blog?
>
>
>
> Thanks
>
>
>
> Tim
>
>
>
>
>
> ------------------------------------------------------------------------
>
> *From:* Eric.Frank at Sun.COM [mailto:Eric.Frank at Sun.COM]
> *Sent:* Friday, February 06, 2009 7:30 AM
> *To:* Tim Brown
> *Cc:* Ward.Eldred at Sun.COM; Gary Losito
> *Subject:* Re: Disk Pool overhead
>
>
>
> Hi Tim,
>
> Take a look at this blog entry....
> http://blogs.sun.com/ahl/entry/sun_storage_7410_space_calculator
>
> at the bottom of the blog there is a note which mentions that ZFS only
> takes up a sliver of space:
> *"Update February 4, 2009:* Ryan Matthews
<http://blogs.sun.com/rdm> and I
> collaborated
<http://blogs.sun.com/rdm/entry/enhancing_the_size_calculator>
> on a new version of the size calculator that now lists the raw space
> available in TB (decimal as quoted by drive manufacturers for example) as
> well as the usable space in TiB
<http://en.wikipedia.org/wiki/Tebibyte>
> (binary as reported by many system tools). The latter also takes account of
> the sliver (1/64th) reserved by ZFS:"
>
> -eric :)
>
> Tim Brown wrote:
>
> Hahaha
> The devils in the statistics.
>
> Not having read the article you referenced, 40 percent could be eaten up,
> depending on the snap reserve space. The default is 20 percent I think. I
> know it could be even higher if configured that way.
> So whether its 20, 30, 40 - its got to be more than zfs, since zfs
doesn''t
> pre-allocate. Different people have asked me, and I just dont know, and
> noone in the class I just took either; - which has led me to you. The Oz of
> Sun.
> Thanks
>
> Tim
>
>
> ----- Original Message -----
> From: Ward.Eldred at Sun.COM <mailto:Ward.Eldred at Sun.COM>
> <Ward.Eldred at Sun.COM> <mailto:Ward.Eldred at Sun.COM>
> To: Tim Brown
> Cc: Eric.Frank at Sun.COM <mailto:Eric.Frank at Sun.COM>
<Eric.Frank at Sun.COM>
> <mailto:Eric.Frank at Sun.COM>; Gary Losito
> Sent: Thu Feb 05 20:18:37 2009
> Subject: Re: Disk Pool overhead
>
> Hi Tim,
>
> From my notes, NetApp shaves off atleast 40% of usable space depending on
> what you are doing.
>
> Check out this blog on HP:
>
>
http://www.communities.hp.com/online/blogs/datastorage/archive/2008/11/24/netapp-usable-capacity-going-going-gone.aspx
>
> If you''re really bored, Google "netapp usable space" and
you can read all
> night...
>
> Ward
>
>
>
> Tim Brown wrote:
>
> On my bberry, but will give it a look when I get to a pc.
> I know that netapp shaves off about 10-20 percent, just
> wondering what the 7000s do
> Ill let you know
> Thanks again
> Tim
> ----- Original Message -----
> From: Ward.Eldred at Sun.COM <mailto:Ward.Eldred at Sun.COM>
> <Ward.Eldred at Sun.COM> <mailto:Ward.Eldred at Sun.COM>
> <mailto:Ward.Eldred at Sun.COM>
> To: Tim Brown
> Cc: Eric.Frank at Sun.COM <mailto:Eric.Frank at Sun.COM>
> <Eric.Frank at Sun.COM> <mailto:Eric.Frank at Sun.COM>
> <mailto:Eric.Frank at Sun.COM> ; Gary Losito
> Sent: Thu Feb 05 18:49:17 2009
> Subject: Re: Disk Pool overhead
> Hi Tim,
> Check out the following on the Sun Storage 7000. It describes
> the
> "usable space" based on
> the different RAID configurations. Is this more in line with what
> you''re looking for ?
> Ward
> Tim Brown wrote:
> >
> > Eric/Ward,
> >
> >
> >
> > With commonly used filesystems such as UFS/VXFS/NTFS, a chunk
of
> disk
> > space is reserved off the top for inodes/metadata.
> >
> >
> >
> > With ZFS and the 7000 pools, what is the approximate overhead
> space?
> >
> >
> >
> >
> >
> > Another way to put it, using an example,
> >
> >
> >
> > If I have a single 72GB disk,
> >
> >
> >
> > What will be available in the BUI for available space?
> >
> >
> >
> > Thanks
> >
> >
> >
> > Tim
> >
> >
> >
> --
> <http://www.sun.com> * Ward Eldred *
> Systems Engineer
> *Sun Microsystems, Inc.*
> 400 Atrium Drive, 1st and 2nd Floors
> Somerset, NJ 08873
> Phone 877-426-8200 (x63387)
> Fax 732-302-3939
> Email Ward.Eldred at Sun.COM <mailto:Ward.Eldred at Sun.COM>
>
>
>
> --
>
> <http://www.sun.com> Ward Eldred
> Systems Engineer
>
> Sun Microsystems, Inc.
> 400 Atrium Drive, 1st and 2nd Floors
> Somerset, NJ 08873
> Phone 877-426-8200 (x63387)
> Fax 732-302-3939
> Email Ward.Eldred at Sun.COM <mailto:Ward.Eldred at Sun.COM>
>
>
>
> --
>
>
> --
> <http://www.sun.com> * Eric Frank*
> Partner Systems Engineer
>
> *Sun Microsystems, Inc.*
> 45 Network Dr.
> Burlington, MA. 01803 US
> Phone 781-442-2698 (x 22698)
> Mobile 603-759-4846
> Email eric.frank at sun.com
>
--
Adam Leventhal, Fishworks http://blogs.sun.com/ahl
--
<http://www.sun.com> * Eric Frank*
Partner Systems Engineer
*Sun Microsystems, Inc.*
45 Network Dr.
Burlington, MA. 01803 US
Phone 781-442-2698 (x 22698)
Mobile 603-759-4846
Email eric.frank at sun.com
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