HP DL360-G6. SAS controller with battery backed write accelerator.
I havent been focusing on the reliability of the drives as this is proof
of concept testing. If we decide to use it, the drives will be replaced
with 2TB SSD PCIe cards.
-Patrick
Sent: Wed Jan 05 2011 08:52:04 GMT-0700 (Mountain Standard Time)
From: Spelic <spelic@xxxxxxxxxxxxx>
To: Patrick H. <linux-raid@xxxxxxxxxxxx> linux-raid
<linux-raid@xxxxxxxxxxxxxxx>
Subject: Re: filesystem corruption
On 01/05/2011 03:28 PM, Patrick H. wrote:
No, my drives are battery backed as well.
what drives are they, if I can ask? OCZ SSDs with supercapacitor maybe?
Do you know if they will really flush the whole write cache on sudden
power off? I read smoky sentences about this for the OCZ drives. In
certain points it seemed like the supercapacitor was only able to
provide the same guarantees of a HDD, that is, no further data loss
due to erase-then-rewrite-32K and flash wear levelling stuff, but was
not able to flush the write cache.
Did you try with e.g. a stream of simple databases transactions then
disconnecting the cable suddenly like this test
http://www.mysqlperformanceblog.com/2009/03/02/ssd-xfs-lvm-fsync-write-cache-barrier-and-lost-transactions/
?
Thank you
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