On Dec 17, 2006, at 6:57 PM, Al Hopper wrote:
On Sun, 17 Dec 2006, Ricardo Correia wrote:
On Friday 15 December 2006 20:02, Dave Burleson wrote:
Does anyone have a document that describes ZFS in a pure
SAN environment? What will and will not work?
From some of the information I have been gathering
it doesn't appear that ZFS was intended to operate
in a SAN environment.
This might answer your question:
http://www.opensolaris.org/os/community/zfs/faq/#hardwareraid
The section entitled "Does ZFS work with SAN-attached devices?"
does not
make it clear the (some would say) dire effects of not having pool
redundancy. I think that FAQ should clearly spell out the
downside; i.e.,
where ZFS will "say" (Sorry Charlie) "pool is corrupt".
A FAQ should always emphasize the real-world downsides to poor
decisions
made by the reader. Not delivering "bad news" does the reader a
dis-service IMHO.
Regards,
Al Hopper Logical Approach Inc, Plano, TX. [EMAIL PROTECTED]
Voice: 972.379.2133 Fax: 972.379.2134 Timezone: US CDT
OpenSolaris.Org Community Advisory Board (CAB) Member - Apr 2005
OpenSolaris Governing Board (OGB) Member - Feb 2006
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Hmmm... A question. Are you referring to not using redundancy within
the array, or not using a redundant pool configuration?
In the case of the former, I completely agree.
In the case of the latter using intelligent arrays, I don't see how
the a 'pool corrupt' problem differs from any non-zfs solution
today. If you're using RAID-5 LUNs along with UFS/VxFS/SVM with no
mirroring, you're in the same situation; corruption within the array
will require a data restore.
Personally, I think data that requires more than RAID-5 redundancy
should be mirrored between discrete storage arrays. This
configuration allows ZFS to mirror the data, while using RAID-5 (or
better) within the controllers for best performance.
This solution isn't cheap, however. The justification for a dual-
array solution really depends on the data value.
-----
Gregory Shaw, IT Architect
IT CTO Group, Sun Microsystems Inc.
Phone: (303)-272-8817
500 Eldorado Blvd, UBRM02-157 [EMAIL PROTECTED] (work)
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"When Microsoft writes an application for Linux, I've won." - Linus
Torvalds
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