Ubuntu :: Embeded - Nas From Usb Stick Slow Transfers

Nov 21, 2010

With Ubuntu 10.10 server installed on an
- AMD Athlon II X2 235E CPU AM3
- 2GB DDR3

Installed on a software raid 1 of 16 GB usb sticks that can sustain 24MB/s read and 13MB/s write rates
running
- ssh
- zfs-fuse installed from apt
- samba

With the zfs using the sata II controller, with a 2TB, 1.5TB and 500GB in a raidz1 (I know, it's uneven, I'll be changing them all to 2TB once I get the data off those drives).

However I'm experiencing a REALLY REALLY exceptionally slow zfs performance of only 600KB/s transfer rate even when using the command:

To test. CPU usage is only at 25% (with dedup=on) however I notice that the usb sticks are regularly transferring data during this write to the zfs pool. Also when doing a zpool scrub it completes 9.6GB of scrubbing in well under 2 minutes. Admittedly it shouldn't actually be doing much as no data was changed by me while the 3rd drive was unavailable.

I'm thinking that there is some data being temporarily saved to the main system drive (usb sticks) and then transferred to the pool, and this is causing a bottle neck. Note both 16gb usb sticks are plugged in to the same usb 2 host controller, but the combined write bandwidth of those sticks is not enough to saturate a usb2 bus.

How to track down this bottle neck?

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[code]....

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Code:

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[code]....

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[Code]...

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