ZFS performance

[eldaria]

I did not watch it the whole time but last night it finished in 1 hour 59 minutes.
Given that I have about 654GB, that should give an average of 94MB/s, not that great.

But I do get excellent transfer speed with your command, I posted them above unfortunately I fogot to separate it from the rest. Here it is again:

Compression off:

root@lnx:/z1pool/test# dd if=/dev/zero of=zerofile.000 bs=1M count=10000; sleep 30 ; dd if=zerofile.000 of=/dev/null bs=1M
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 17.2174 s, 609 MB/s
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 9.93469 s, 1.1 GB/s

Compression on:

root@lnx:/z1pool/test# dd if=/dev/zero of=zerofile.000 bs=1M count=10000; sleep 30 ; dd if=zerofile.000 of=/dev/null bs=1M
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 1.92519 s, 5.4 GB/s
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 0.904744 s, 11.6 GB/s

However dropping the block size reduces the speed significantly, but it seems the CPU will spike too 99% on the dd process, so I guess it is not zfs causing the bottleneck here.

Is there some other way to test the performance, I read about Bonnie, but I can't figure out how to read the results, or compare them.

[rubylaser]

With 16GB of RAM, those results are hitting RAM. To test the disks properly, you'll really need to use a count that will yield files at least 2x the amount of RAM you have, and with compression turned on , your dd values aren't really realistic anymore, although they look awesome

Here's an old post of mine talking about setting up bonnie.