On 11/15/2010 2:55 PM, Matt Banks wrote:
I asked this on the x86 mailing list (and got a "it should work" answer), but
this is probably more of the appropriate place for it.
In a 2 node Sun Cluster (3.2 running Solaris 10 u8, but could be running u9 if
needed), we're looking at moving from VXFS to ZFS. However, quite frankly,
part of the rationale is L2ARC. Would it be possible to use internal (SSD)
storage for the L2ARC in such a scenario? My understanding is that if a ZFS
filesystem is passed from one node to another, the L2ARC has to be rebuilt.
So, why can't it just be rebuilt on internal storage?
The nodes (x4240's) are identical and would have identical storage installed,
so the paths would be the same.
Has anyone done anything similar to this? I'd love something more than "it should
work" before dropping $25k on SSD's...
TIA,
matt
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If your SSD is part of the shared storage (and, thus, visible from both
nodes), then it will be part of the whole pool when exported/imported by
the cluster failover software.
If, on the other hand, you have an SSD in each node that is attached to
the shared-storage as L2ARC, then it's not visible to the other node,
and the L2ARC would have to be reattached and rebuilt in a failover senario.
If you are using only X4240 systems ONLY, then you don't have ANY shared
storage - ZFS isn't going to be able to "failover" between the two
nodes. You'd have to mirror the data between the two nodes somehow;
they wouldn't be part of the same zpool.
Really, what you want is something like a J4000-series dual-attached to
both X4240, with SSDs and HDs installed in the J4000-series chassis, not
in the X4240s.
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
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