On 07/23/2013 10:00 AM, Chris Hoy Poy wrote:
+1 for sTec, I'm using sTec ZeusRAM devices (expensive, small capacity - 8GB) but if write latency is important..
I haven't deployed them in a Ceph environment, but I've been using them
for ZFS ZILs for a couple of years. Amazingly fast SSDs, but yes, pretty
expensive.
About EUR 2250,00 (~$3000.00) for a 8GB SSD.
Wido
4x OSDs (3TB 7200rpm SATA) to each ZeusRAM for our scenario.
\\Chris
----- Original Message -----
From: "Charles 'Boyo" <charlesboyo@xxxxxxxxx>
To: "Mark Nelson" <mark.nelson@xxxxxxxxxxx>
Cc: ceph-users@xxxxxxxxxxxxxx
Sent: Tuesday, 23 July, 2013 4:27:07 AM
Subject: Re: SSD recommendations for OSD journals
On Mon, Jul 22, 2013 at 7:10 PM, Mark Nelson <mark.nelson@xxxxxxxxxxx> wrote:
On 07/22/2013 01:02 PM, Oliver Fuckner wrote:
Good evening,
On the second look you see that they use 4 Sandisk X100 SSDs in RAID5
and those SSDs only have 80TBytes Write Endurance each... that makes me
nervous.
I'm less interested in the nvdrive, and more interested in the nvram.
with 8GB of RAM you could reasonably do journals for 24 OSDs and it's
backed by 32GB of flash for power failure. Only questions are whether
or not the board itself is reliable (though hopefully it would be no
less reliable than a traditional SAS controller), and whether or not the
super capacitor can be trusted.
Of course cost could be an issue...
Barring the cost, sTec solutions have proven reliable for me.
Check out the s1122 with 1.6 TB capacity and 90PB write endurance:
http://www.stec-inc.com/products/s1120-pcie-accelerator/
Charles
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--
Wido den Hollander
42on B.V.
Phone: +31 (0)20 700 9902
Skype: contact42on
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