of it's implementation. By supporting
multiple log device types and configurations it ultimately enables a broad
range of performance capabilities!
Best regards,
Chris
--
Christopher George
cgeorge at ddrdrive.com
http://www.ddrdrive.com
://www.intel.com/content/www/us/en/solid-state-drives/ssd-320-series-power-loss-data-protection-brief.html
Intel's brief also clears up a prior controversy of what types of
data are actually cached, per the brief it's both user and system
data!
Best regards,
Christopher George
www.ddrdrive.com
?
Yes! Customers using Illumos derived distros make-up a
good portion of our customer base.
Thanks,
Christopher George
www.ddrdrive.com
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the SSD's internal meta data...
I'm curious, any other interpretations?
Thanks,
Chris
Christopher George
cgeorge at ddrdrive.com
http://www.ddrdrive.com/
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disable the on-board write cache.
Christopher George
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to TRIM support status and
thus unaffected. Actually, TRIM support would only add
unnecessary overhead to the DDRdrive X1's device driver.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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/scripts-and-programs-1/zilstat
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they
have been TRIM'd or not TRIM'd.
You guys have become fixated at TRIM not speeding up the drive and forget
that Duraclass controls all writes incurred by the drive once a GC map has
been written.
Above excerpts written by a OCZ employed thread moderator (Tony).
Best regards,
Christopher
on a rotating drive is roughly 100
IOPS with queueing), that it'll still provide a huge performance boost
when used as a ZIL in their system.
I agree 100%. I never intended to insinuate otherwise :-)
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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, the resulting degradation
will vary depending on the controller used.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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,
Christopher George
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www.ddrdrive.com
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got it attached to a UPS with very conservative shut-down timing. Or
are there other host failures aside from power a ZIL would be
vulnerable too (system hard-locks?)?
Correct, a system hard-lock is another example...
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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, or even
week really be the most cost effective use of an administrators time?
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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context:
http://www.oug.org/files/presentations/zfszilsynchronicity.pdf
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Christopher George
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www.ddrdrive.com
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regards,
Christopher George
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-limit.
The reason the graphs are done in a time line fashion is so you look
at any point in the 1 hour series to see how each device performs.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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TRIM was putback in July... You're telling me it didn't make it into S11
Express?
Without top level ZFS TRIM support, SATA Framework (sata.c) support
has no bearing on this discussion.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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no effect on the eventual outcome. So with either a
bursty
or sustained workload the end result is always the same, dramatic write IOPS
degradation after unpackaging or secure erase of the tested Flash based SSDs.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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of the resultant binaries?
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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,
Christopher George
Founder/CTO
www.ddrdrive.com
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Any opinions? stories? other models I missed?
I was a speaker at the recent OpenStorage Summit,
my presentation ZIL Accelerator: DRAM or Flash?
might be of interest:
http://www.ddrdrive.com/zil_accelerator.pdf
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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(or aggregate) write pattern trends to random. Over
50% random with a pool containing just 5 filesystems. This makes
intuitive sense knowing each filesystem has it's own ZIL and they
all share the dedicated log (ZIL Accelerator).
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
delineate the storage media used depending on host
power condition. The X1 exclusively uses DRAM for all IO
processing (host is on) and then Flash for permanent non-volatility
(host is off).
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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the same fate, as its
performance is not bound by or vary with partition (mis)alignment.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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accelerator well matched to the 24/7 demands of enterprise use.
Thanks,
Christopher George
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www.ddrdrive.com
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Here is another very recent blog post from ConstantThinking:
http://constantin.glez.de/blog/2010/07/solaris-zfs-synchronous-writes-and-zil-explained
Very well done, a highly recommended read.
Christopher George
Founder/CTO
www.ddrdrive.com
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principles
and benefits of multi-core processing apply here with multiple controllers.
The performance potential of NVRAM based SSDs dictates moving away
from a single/separate HBA based controller.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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protecting on-board
volatile caches. As the X25-E does implement the ATA FLUSH
CACHE command, but does not have the required power protection to
avoid transaction (data) loss.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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No Slogs as I haven't seen a compliant SSD drive yet.
As the architect of the DDRdrive X1, I can state categorically the X1
correctly implements the SCSI Synchronize Cache (flush cache)
command.
Christopher George
Founder/CTO
www.ddrdrive.com
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transactions and do not lose transactions on
a
host power failure, we are competitively priced at $1,995 SRP.
Christopher George
Founder/CTO
www.ddrdrive.com
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market.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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removable media.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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.
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to detail.
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Christopher George
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www.ddrdrive.com
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to be available support plans. Your voice
will be
heard, please email directly at cgeorge at ddrdrive dot com for requests,
comments
and/or questions.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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) an
additional option.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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PCIe connection.
Very appreciative of the feedback!
Christopher George
Founder/CTO
www.ddrdrive.com
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currently found on RAID controllers. It would require either a
substantial increase in energy density or a decrease in packaging volume
both of which incur additional risks.
Interesting product though!
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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standard method of enterprise class data backup.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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respect your point of view, and do
agree strongly that Li-Ion batteries play a critical and highly valued role in
many industries.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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to be
unpopulated so that an internal power source could be utilized. We will
make this modification available to any customer who asks.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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Personally I'd say it's a must. Most DC's I operate in wouldn't tolerate
having a card separately wired from the chassis power.
May I ask the list, if this is a hard requirement for anyone else?
Please email me directly cgeorge at ddrdrive dot com.
Thank you,
Christopher George
Founder/CTO
in the advancement of Open
Storage and explore the far-reaching potential of ZFS
based Hybrid Storage Pools?
If so, please send an inquiry to zfs at ddrdrive dot com.
The drive for speed,
Christopher George
Founder/CTO
www.ddrdrive.com
*** Special thanks goes out to SUN employees Garrett D'Amore and
James
.
Christopher George
Founder/CTO
www.ddrdrive.com
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