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Thanks for posting this. I do use the Droid on my Harley. I love that I can now use google maps/navigator for FREE. [...]

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timmah powah! go go open source!

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I just like the fact that i had to use a linux box to open a file from a vendor (office2007 file -> openoffice)

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Tuesday, October 14. 2008

I got an email from a user on the FreeNAS help forum asking me if I had tested the write speed of my ZFS RAID array.

He was upset that he was only getting 45 MB/second.

So I tested it:

# dd if=/dev/zero of=mytestfile.out bs=1000 count=1000000

1000000+0 records in
1000000+0 records out
1000000000 bytes transferred in 49.676133 secs (20130391 bytes/sec)

Pretty abysmal.

I'm running on three 500GB IDE drives plugged into three Promise Ultra100 TX2 dual channel IDE controllers on a 2.3GHz Xeon with 1 GB of RAM, so it's not the speediest of hardware.

Just for grins I tested the read performance by reversing the dd command:

# dd of=/dev/null if=mytestfile.out bs=1000
1000000+0 records in
1000000+0 records out
1000000000 bytes transferred in 21.032432 secs (47545619 bytes/sec)

As you would expect, the read performance is much better than the write.

I had run a whole bunch of tests on the hardware when I was building my OpenFiler box, I suppose I should run those tests again using FreeNAS.

I'll have to figure out how to get bonnie++ running under FreeBSD.

Posted by Timothy Foreman in Computers at 08:11 | Comment (1) | Trackbacks (0)

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Hi Timothy,

I've received a similar email. It looks like that this has something to do which options you use with dd. A blocksize (bs) of 1000 is not enought. See my latest blog entry for more details.

Regards, harryd

#1 harryd71 (Homepage) on 2008-10-14 15:51 (Reply)

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