On Tue, 23 Feb 2010, Dave wrote:
If the SSDs lose data only on complete power loss to the machine, then
using them in a datacenter environment and a machine with redundant
PSUs/circuits/UPSs may be acceptable to some. Losing data because of a
hard reboot/power off would be much more worrisome, IMO.
If a machine is using an SSD as a ZIL -- the *sole purpose* of which is to
complete writes after a power loss -- and the SSD cannot survive such a
power loss, then you're better off just disabling the zil and living with
the loss of data.
Has anyone actually tested X25-Es for lost writes using ZFS?
--
Dave
On 2/23/10 4:04 PM, Robert Heinzmann (reg) wrote:
Hello Nate,
watch out for proper ZIL devices. X25-E is not a good choice.
see
http://www.mysqlperformanceblog.com/2009/03/02/ssd-xfs-lvm-fsync-write-cache-barrier-and-lost-transactions/
Choosing the right ZIL devices is essential for data integrity. Same
goes for data disks (cache flush).
Regards,
Robert
Nate Carlson schrieb:
Hey all,
I've put up a blog post on issues we're having with 3 brand new
Unified Storage 7210 arrays, available here:
http://tinyurl.com/yeo9pft
I'm curious if the symptoms (spurious halt, spurious vlan ipmp group
dropping, spurious reboots) that we are seeing are common for the
X4540 machine, or if you think it's likely to be a problem with the
way Sun rolls the Unified Storage software package.
If it is a software issue, and we are unable to return these machines,
I'm considering running either OpenSolaris or NexentaStor on the
hardware.. hoping that it's a software issue and not hardware. ;)
(Going OpenSol or Nexenta would also let us add our own SSD's without
worrying about Sun complaining about it.. $400 for 32gb x25-e's sounds
a lot better than $6k for an 18gb Logzilla!)
Appreciate any thoughts!
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Regards,
markm
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