I''m trying to pick between an Intel X25-M or Intel X25-E for a slog device. At some point in the future, TRIM support will become available <http://mail.opensolaris.org/pipermail/onnv-notify/2010-July/012674.html>. The X25-M support TRIM while X25-E don''t support trim. Does TRIM support mater when selecting slog drives? Thanks Karl CONFIDENTIALITY NOTICE: This communication (including all attachments) is confidential and is intended for the use of the named addressee(s) only and may contain information that is private, confidential, privileged, and exempt from disclosure under law. All rights to privilege are expressly claimed and reserved and are not waived. Any use, dissemination, distribution, copying or disclosure of this message and any attachments, in whole or in part, by anyone other than the intended recipient(s) is strictly prohibited. If you have received this communication in error, please notify the sender immediately, delete this communication from all data storage devices and destroy all hard copies. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100825/231576df/attachment.html>
IMHO, U want -E for ZIL and -M for L2ARC On 8/25/2010 2:44 PM, Karl Rossing wrote:> I''m trying to pick between an Intel X25-M or Intel X25-E for a slog > device. > > At some point in the future, TRIM support will become available > <http://mail.opensolaris.org/pipermail/onnv-notify/2010-July/012674.html>. > The X25-M support TRIM while X25-E don''t support trim. > > Does TRIM support mater when selecting slog drives? > > Thanks > Karl > > > > > > > > > > > > > > CONFIDENTIALITY NOTICE: This communication (including all attachments) > is confidential and is intended for the use of the named addressee(s) > only and may contain information that is private, confidential, > privileged, and exempt from disclosure under law. All rights to > privilege are expressly claimed and reserved and are not waived. Any > use, dissemination, distribution, copying or disclosure of this > message and any attachments, in whole or in part, by anyone other than > the intended recipient(s) is strictly prohibited. If you have received > this communication in error, please notify the sender immediately, > delete this communication from all data storage devices and destroy > all hard copies. > > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100825/a4bf1afd/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: laotsao.vcf Type: text/x-vcard Size: 221 bytes Desc: not available URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100825/a4bf1afd/attachment.vcf>
Wilkinson, Alex
2010-Aug-26 01:18 UTC
[zfs-discuss] slog and TRIM support [SEC=UNCLASSIFIED]
0n Wed, Aug 25, 2010 at 02:54:42PM -0400, LaoTsao ?????? wrote:
>IMHO, U want -E for ZIL and -M for L2ARC
Why ?
-Alex
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-M has larger capacity and L2ARC is mostly for read and not much write and U also need memory for ARC L2ARC should be the sze of Ur working dataset ZIL is mostly for write and U want SSD for better write and longer life and ZIl may be <=1/2 phy memory regards On 8/25/2010 9:18 PM, Wilkinson, Alex wrote:> 0n Wed, Aug 25, 2010 at 02:54:42PM -0400, LaoTsao ?????? wrote: > > >IMHO, U want -E for ZIL and -M for L2ARC > > Why ? > > -Alex > > IMPORTANT: This email remains the property of the Department of Defence and is subject to the jurisdiction of section 70 of the Crimes Act 1914. If you have received this email in error, you are requested to contact the sender and delete the email. > _______________________________________________ > zfs-discuss mailing list > zfs-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss-------------- next part -------------- A non-text attachment was scrubbed... Name: laotsao.vcf Type: text/x-vcard Size: 221 bytes Desc: not available URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100825/85a8c081/attachment.vcf>
On Wed, Aug 25, 2010 at 6:18 PM, Wilkinson, Alex <alex.wilkinson at dsto.defence.gov.au> wrote:> ? ?0n Wed, Aug 25, 2010 at 02:54:42PM -0400, LaoTsao ?????? wrote: > ? ?>IMHO, U want -E for ZIL and -M for L2ARC > > Why ?-E uses SLC flash, which is optimised for fast writes. Ideal for a ZIL which is (basically) write-only. -M uses MLC flash, which is optimised for fast reads. Ideal for an L2ARC which is (basically) read-only. -E tends to have smaller capacities, which is fine for ZIL. -M tends to have larger capacities, which is perfect for L2ARC. -- Freddie Cash fjwcash at gmail.com