It's hard to comment on how your experience could be made better without
more information about your configuration and how your testing. Anything
along the lines of what LSI controller model, PCI-E bus speed, number of
expander cables, drive type, number of SSDs and whether the SSDs were
connected
While in theory this should be true, I'm not finding it to be the case for a
typical enterprise LSI card with 24 drives attached. We tried a variety of
ratios and went back to collocated journals on the spinning drives.
Eagerly awaiting the tiered performance changes to implement a faster tier
Journal on SSD should effectively double your throughput because data will
not be written to the same device twice to ensure transactional integrity.
Additionally, by placing the OSD journal on an SSD you should see less
latency, the disk head no longer has to seek back and forth between the
journa
> I tried putting Flashcache on my spindle OSDs using an Intel SSL and it works
> great.
> This is getting me read and write SSD caching instead of just write
> performance on the journal.
> It should also allow me to protect the OSD journal on the same drive as the
> OSD data and still get bene
I tried putting Flashcache on my spindle OSDs using an Intel SSL and it
works great. This is getting me read and write SSD caching instead of just
write performance on the journal. It should also allow me to protect the
OSD journal on the same drive as the OSD data and still get benefits of SSD
c
I found this without much effort.
http://www.sebastien-han.fr/blog/2012/11/15/make-your-rbd-fly-with-flashcache/
On Mon, Oct 7, 2013 at 11:39 AM, Jason Villalta wrote:
> I also would be interested in how bcache or flashcache would integrate.
>
>
> On Mon, Oct 7, 2013 at 11:34 AM, Martin Catudal
I also would be interested in how bcache or flashcache would integrate.
On Mon, Oct 7, 2013 at 11:34 AM, Martin Catudal wrote:
> Thank's Mike,
> Kyle Bader suggest me also to use my large SSD (900 GB) as cache
> drive using "bcache" or "flashcache".
> Since I have already plan to use SSD f
Thank's Mike,
Kyle Bader suggest me also to use my large SSD (900 GB) as cache
drive using "bcache" or "flashcache".
Since I have already plan to use SSD for my journal, I would certainly
use also SSD as cache drive in addition.
I will have to read documentation about "bcache" and his integ
Based on my experience I think you are grossly underestimating the expense and
frequency of flushes issued from your vm's. This will be especially bad if you
aren't using the async flush from qemu >= 1.4.2 as the vm is suspended while
qemu waits for the flush to finish. I think your best cours
Hi Guys,
I read all Ceph documentation more than twice. I'm now very
comfortable with all the aspect of Ceph except for the strategy of using
my SSD and HDD.
Here is my reflexion
I've two approach in my understanding about use fast SSD (900 GB) for my
primary storage and huge but slower H
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