On Oct 4, 2012, at 1:33 PM, "Schweiss, Chip" <c...@innovates.com> wrote:
> Again thanks for the input and clarifications. > > I would like to clarify the numbers I was talking about with ZiL performance > specs I was seeing talked about on other forums. Right now I'm getting > streaming performance of sync writes at about 1 Gbit/S. My target is closer > to 10Gbit/S. If I get to build it this system, it will house a decent size > VMware NFS storage w/ 200+ VMs, which will be dual connected via 10Gbe. > This is all medical imaging research. We move data around by the TB and fast > streaming is imperative. > > On the system I've been testing with is 10Gbe connected and I have about 50 > VMs running very happily, and haven't yet found my random I/O limit. However > every time, I storage vMotion a handful of additional VMs, the ZIL seems to > max out it's writing speed to the SSDs and random I/O also suffers. With > out the SSD ZIL, random I/O is very poor. I will be doing some testing with > sync=off, tomorrow and see how things perform. > > If anyone can testify to a ZIL device(s) that can keep up with 10GBe or more > streaming synchronous writes please let me know. Quick datapoint, with qty 3 ZeusRAMs as striped slog, we could push 1.3 GBytes/sec of storage vmotion on a relatively modest system. To sustain that sort of thing often requires full system-level tuning and proper systems engineering design. Fortunately, people tend to not do storage vmotion on a continuous basis. -- richard -- richard.ell...@richardelling.com +1-760-896-4422
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