Performances of ZEVO with external drives

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Performances of ZEVO with external drives

Post by si-ghan-bi » Sat Sep 15, 2012 10:24 am

Hello,
I took two USB sticks, I put them on different USB controllers (the iMac has 3 of them), then I copied the same file (movie) from internal to each USB flash drive. Speed measured: 10-12 MB/s each. That's good, it means that even on the same USB2 controller, they would not saturate it.
I generated a mirror as written in the ZEVO PDF and I tried to copy the same movie: less than 1 MB/s. Is it normal?
I aborted the process (and it took a very long time to abort) and I copied an application (77 MB).
I ejected the zfs volume, tried to mount it again with Disk Utility, experienced the kernel panic mentioned in another thread, rebooted, the copied the application to the desktop. I measured about 7 MB/s, still less than 20 MB/s I expected from a mirror pool.
Could someone else check the performances? Unfortunately I cannot test with real HD and they would be USB anyway, since I use an iMac.

I will try striping now.
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Re: Performances of ZEVO with external drives

Post by si-ghan-bi » Sat Sep 15, 2012 11:26 am

In striping I get about 2 MB/s for writing, 25 MB/s for reading.
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Re: Performances of ZEVO with external drives

Post by holzi » Sun Sep 16, 2012 10:56 am

will try to test tomorrow if I find a second usb disk.
I do write about 23 mb/s on a older 2,5 HDD connected via usb.
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Re: Performances of ZEVO with external drives

Post by si-ghan-bi » Sun Sep 16, 2012 1:11 pm

I get about the same on a 1 TB 3.5" USB2 hard disk.
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Re: Performances of ZEVO with external drives

Post by jasonturner » Sun Sep 16, 2012 2:54 pm

I'm running RAIDZ on a Promise Pegasus R4 and getting 63MB/sec writes and 145MB/sec reads over thunderbolt on a Mac Mini.

Tested using Helios LanTest
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Re: Performances of ZEVO with external drives

Post by si-ghan-bi » Sun Sep 16, 2012 4:45 pm

For the first time ever, I saw 2,9 GB wired memory on my iMac (total RAM: 6 GB).
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Re: Performances of ZEVO with external drives

Post by holzi » Mon Sep 17, 2012 3:49 am

Ok I did a test with 2 usb drives as a mirror performace stayed at the expected 23-25MB/s I saw with a single disk. Why the usb sticks failed to behave this way I don't know.
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Re: Performances of ZEVO with external drives

Post by si-ghan-bi » Mon Sep 17, 2012 10:06 am

I think one stick was defective.
Concerning your test, writing should stay at 20-25 MB/s, but reading should double that value, as long as you use two usb2 controllers. Even with only one, you should get 30-35 MB/s.
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Re: Performances of ZEVO with external drives

Post by tenshi » Tue Sep 18, 2012 6:32 am

I'm essentially getting fluctuating speeds between 8 and 23 megs per second on firewire800 enclosure (Mediasonic Pro Raid)
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Re: Performances of ZEVO with external drives

Post by si-ghan-bi » Tue Sep 18, 2012 7:18 am

Yeah, definitely below the interface capabilities. I hope in the next days someone will benchmark properly zevo.
BTW, please specify explicitly if you mean read or write performances, especially in mirror configuration.
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