we target (enterprise customers).
The beauty of ZFS is the flexibility of it's implementation. By supporting
multiple log device types and configurations it ultimately enables a broad
range of performance capabilities!
Best regards,
Chris
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C
ing more than to continue to
design and offer our unique ZIL accelerators as an alternative to Flash
only SSDs and hopefully help (in some small way) the success of ZFS.
Thanks again for taking the time to share your thoughts!
The drive for speed,
Chris
--------
Christopher Geor
ta" to mean 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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zf
?
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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rotection" at:
http://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,
Christophe
slice instead of the entire device will
automatically disable the on-board write cache.
Christopher George
Founder / CTO
http://www.ddrdrive.com/
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is immune 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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SATA cable, see slides 15-17.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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ing.com/Home/scripts-and-programs-1/zilstat
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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aster,
> assuming that cache disabled 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
Fou
Above excerpts written by a OCZ employed thread moderator (Tony).
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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g in a larger context:
http://www.oug.org/files/presentations/zfszilsynchronicity.pdf
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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ng to perform a Secure Erase every hour, day, 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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y" than sync=disabled.
Best regards,
Christopher George
Founder/CTO
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
e.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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are valid, the resulting degradation
will vary depending on the controller used.
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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he size of the resultant binaries?
Thanks,
Christopher George
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www.ddrdrive.com
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is
drive inactivity has 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.
> 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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the hour time-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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IOPS / $1,995) = 19.40
Best regards,
Christopher George
Founder/CTO
www.ddrdrive.com
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1 Express!
Best regards,
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
--
nt (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.d
en
though we 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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SSD does *not* suffer 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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are a
ZIL accelerator well matched to the 24/7 demands of enterprise use.
Thanks,
Christopher George
Founder/CTO
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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. The same 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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as not power 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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SSDs that fully comply with the
POSIX
requirements for synchronous write 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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> 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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to/from removable media.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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market.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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and an overwhelming attention to detail.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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.
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Christopher George
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www.ddrdrive.com
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ers well.
We are actively designing our soon to be available support plans. Your voice
will be
heard, please email directly at for requests,
comments
and/or questions.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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rs (non-clustered) an
additional option.
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".
Th
t for the DC jack 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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ree to disagree. I 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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because it is a proven and industry
standard method of enterprise class data backup.
Thanks,
Christopher George
Founder/CTO
www.ddrdrive.com
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oduct cannot be supported by
any of the BBUs 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
r HBA's
which do require a x4 or x8 PCIe connection.
Very appreciative of the feedback!
Christopher George
Founder/CTO
www.ddrdrive.com
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ovides an optional (user
configured) backup/restore feature.
Christopher George
Founder/CTO
www.ddrdrive.com
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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'
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