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?
Hi Bill,
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?
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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