On Thu, Jan 8, 2009 at 5:54 PM, gnomad <gno...@gmail.com> wrote: > Ok, I'm going to reply to my own question here. After a few hours of > thinking, I believe I know what is going on. > > I am seeing the initial high network throughput as the 4GB of RAM in the > server fills up with data. In fact, in this case, I am bound by the speed > of the source drive, which tops out at about 40 MB/s -- just what I am > seeing as the copy starts. Eventually, the network speed settles down to > the write speed of the local pool. Copying files locally (on and off the > pool) shows that the sustained write speeds are, in fact, about 17-20 MB/s. > > So, this brings up a new question, are these speeds typical? For > reference, my pool is built from 6 1TB drives configured as RAIDZ2 driven by > an ICH9(R) configured in AHCI mode. I am aware that RAIDZ2 performance will > always be less than the speed of individual disks, but this is a little bit > more than I was expecting. Individually, these drives benchmark around > 60-70 MB/s, so I am looking at a fairly substantial penalty for the > reliability of RAIDZ2. > > I'll CC this message to the CIFS and Networking lists to prevent anyone > else from waiting time writing a reply, as the appropriate place for this > thread is now confirmed to be zfs-discuss. > > -g. > -- >
That seems really, relaly low. What are your sustained read speeds? --Tim
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