On Thu, 7 May 2009, Scott Lawson wrote:
Something nice about the STK2540 solution is that if the server system
dies. The STK2540's can quickly be swung over to another system via a quick
'zfs import'.
Sure provided they have it attached to a fibre channel switch or
have a nice long fibre lead. The difference is negligible
The 2540 has four fiber connections so two hosts can have directly
connected duplex fiber. Of course only one host can be allowed to
use the zfs pool at a time. Provided that the failed server is really
down, it should take only seconds to import the pool on the backup
server. Ideally a mobile IP address is pre-arranged to allow the NFS
service to be moved at the same time.
It is possible to buy these J series JBODS with bundled SSD's as well right
now. Log device would be contained in this
chassis which would facilitate easy importing and exporting in the case of a
system shift being required.
Embedded SSDs in the JBOD array would surely help with this problem.
The "DIMM" solution we heard about recently on this list would pose a
problem since the "DIMM" device would need to be moved and the
secondary server would need to have a slot for it.
After all this discussion, I am not sure if anyone adequately answered
the original poster's question as to whether at 2540 with SAS 15K
drives would provide substantial synchronous write throughput
improvement when used as a L2ARC device.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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