On Tue, 16 Dec 2014 12:10:42 +0300 Mike wrote:
16.12.2014 10:53, Daniel Schwager пишет:
Hallo Mike,
This is also have another way.
* for CONF 2,3 replace 200Gb SSD to 800Gb and add another 1-2 SSD to
each node.
* make tier1 read-write cache on SSDs
* also you can add journal
Hi,
I’m buying several servers to test CEPH and I would like to configure journal
on SSD drives (maybe it’s not necessary for all use cases)
Could you help me to identify number of SSD I need (SSD are very expensive and
GB price business case killer… ) ? I don’t want to experience SSD
...@lists.ceph.com] On Behalf Of
Florent MONTHEL
Sent: 15 December 2014 19:45
To: ceph-users@lists.ceph.com
Subject: [ceph-users] Number of SSD for OSD journal
Hi,
I’m buying several servers to test CEPH and I would like to configure journal
on SSD drives (maybe it’s not necessary for all use cases
Salut,
The general recommended ratio (for me at least) is 3 journals per SSD. Using
200GB Intel DC S3700 is great.
If you’re going with a low perf scenario I don’t think you should bother buying
SSD, just remove them from the picture and do 12 SATA 7.2K 4TB.
For medium and medium ++ perf using
Thanks all
I will probably have 2x10gb : 1x10gb for client and 1x10gb for cluster but I
take in charge your recommendation Sebastien
The 200GB SSD will probably give me around 500MB/s sequential bandwidth. So
with only 2 SSD I can overload 1x 10gb network.
Hum I will take care of osd density
I was going with a low perf scenario, and I still ended up adding SSDs.
Everything was fine in my 3 node cluster, until I wanted to add more nodes.
Admittedly, I was a bit aggressive with the expansion. I added a whole
node at once, rather than one or two disks at a time. Still, I wasn't
Hello,
On Mon, 15 Dec 2014 22:43:14 +0100 Florent MONTHEL wrote:
Thanks all
I will probably have 2x10gb : 1x10gb for client and 1x10gb for cluster
but I take in charge your recommendation Sebastien
The 200GB SSD will probably give me around 500MB/s sequential bandwidth.
Intel DC S3700
15.12.2014 23:45, Sebastien Han пишет:
Salut,
The general recommended ratio (for me at least) is 3 journals per SSD. Using
200GB Intel DC S3700 is great.
If you’re going with a low perf scenario I don’t think you should bother
buying SSD, just remove them from the picture and do 12 SATA
Hallo Mike,
This is also have another way.
* for CONF 2,3 replace 200Gb SSD to 800Gb and add another 1-2 SSD to
each node.
* make tier1 read-write cache on SSDs
* also you can add journal partition on them if you wish - then data
will moving from SSD to SSD before let down on HDD
* on HDD
