Forums » Performance discussions »
Gigabyte I-RAM for ZIL
Added by Darren Wright 10 months ago
I'm new to NEX, moving over from OF and Open-E. I've been reading quit a bit about the ZIL, and I've got an interesting thought.
We own a bunch of Gigabyte I-RAM 4GB drives. They are battery backed DDR drives, however, they are only SATA I.
I've done some testing:
Poweredge 2900, Dual DC Xeon 20GB RAM SAS6 with 8x750 WD Black 7200RPM SAS6 with Vertex 3 for ARC2 and 2 x 73GB 15k SAS boot drives
Chelsio 10GigE card going to 2 Vmware boxes
My testing shows that inserting the IRAM for the ZIL does little for performance. the IOPS go up some, not much, and the 4k randoms actually get a bit worse.
Any intitial thoughts?
Replies
RE: Gigabyte I-RAM for ZIL - Added by Dan Swartzendruber 10 months ago
What kind of latency and IOPS can the iram drives deliver?
RE: Gigabyte I-RAM for ZIL - Added by Darren Wright 10 months ago
I found this actually:
http://lists.freebsd.org/pipermail/freebsd-stable/2011-January/061025.html
It's about right, 15,000IOPS.
RE: Gigabyte I-RAM for ZIL - Added by Dan Swartzendruber 10 months ago
Actually, sorry, I misread your OP. If you really have 10gbe writing to you, I can easily imagine a sata-1 ZIL being a chokepoint.
RE: Gigabyte I-RAM for ZIL - Added by Christopher George 10 months ago
What kind of latency and IOPS can the iram drives deliver?
Here's some numbers from a prior forum post:
ACARD ANS-9010 Single port - 34,330 RW IOPS
ACARD ANS-9010 Dual ports - 61,916 RW IOPS
Gigabyte i-RAM - 25,576 RW IOPS
DDRdrive X1 - 211,299 RW IOPS
Iometer output (all using the same test system) with a 100% Random Write (RW) workload and a small block size (512B) to flesh out a device's latency potential.
Christopher George
www.ddrdrive.com