On Jan 25, 2007, at 17:30, Albert Chin wrote:
On Thu, Jan 25, 2007 at 02:24:47PM -0600, Al Hopper wrote:
On Thu, 25 Jan 2007, Bill Sommerfeld wrote:
On Thu, 2007-01-25 at 10:16 -0500, Torrey McMahon wrote:
So there's no way to treat a 6140 as JBOD? If you wanted to use
a 6140
with ZFS, and really wanted JBOD, your only choice would be a
RAID 0
config on the 6140?
Why would you want to treat a 6140 like a JBOD? (See the previous
threads about JBOD vs HW RAID...)
Let's turn this around. Assume I want a FC JBOD. What should I
get?
Many companies make FC expansion "boxes" to go along with their FC
based
hardware RAID arrays. Often, the expansion chassis is identical
to the
RAID equipped chassis - same power supplies, same physical chassis
and
disk drive carriers - the only difference is that the slots used
to house
the (dual) RAID H/W controllers have been blanked off. These
expansion
chassis are designed to be daisy chained back to the "box" with
the H/W
RAID. So you simply use one of the expansion chassis and attach it
directly to a system equipped with an FC HBA and ... you've got an FC
JBOD. Nearly all of them will support two FC connections to allow
dual
redundant connections to the FC RAID H/W. So if you equip your
ZFS host
with either a dual-port FC HBA or two single-port FC HBAs - you
have a
pretty good redundant FC JBOD solution.
An example of such an expansion box is the DS4000 EXP100 from
IBM. It's
also possible to purchase a 3510FC box from Sun with no RAID
controllers -
but their nearest equivalent of an "empty" box comes with 6
(overpriced)
disk drives pre-installed. :(
Perhaps you could use your vast influence at Sun to persuade them
to sell
an empty 3510FC box? Or an empty box bundled with a single or
dual-port
FC card (Qlogic based please). Well - there's no harm in making the
suggestion ... right?
Well, when you buy disk for the Sun 5320 NAS Appliance, you get a
Controller Unit shelf and, if you expand storage, an Expansion Unit
shelf that connects to the Controller Unit. Maybe the Expansion Unit
shelf is a JBOD 6140?
that's the CSM200 - the IOMs in that should just take a 2Gb or 4Gb SFP
(copper or fibre) and the tray should run switched loop so you can mix
FC and SATA as it connects back to the 6140 or 6540 controller head.
---
.je
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