ZEVO RAIDZ read/write performance over USB 3

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ZEVO RAIDZ read/write performance over USB 3

Post by mikearma10 » Thu Oct 18, 2012 7:10 am

Hi everyone,

My first post, and first time using ZEVO. I have an 18tb POOL of 8x3tb drives, that I carry around with me in an 8-Bay USB 3.0 (2 x SATA-II host) enclosure. Usually its hooked up to Nexenta, however now I have ZEVO the pool has become very portable, which is great!

However...

I am observing the following speeds

Writes = 80-130MB/s
Reads = 12-30MB/s

Firstly, I would have expected faster reads than writes and also... I am expecting much larger numbers for both values...

So I don't know if this is good or bad performance with ZEVO, is it optimised for speed yet or only reliability?

Here's some stats....

My drives can do a max of 190MB/s each (approx)
The enclosure has 2x SATA-II controllers... so 3gbit on each...

Host system (my Mac) is a MacBook Pro Retina 15" with 16gb Memory, Core i7 2.8GHz Ivy Bridge and 512gb SSD, vanilla install.

I would have expected to see perhaps 200MB/s read/write at least?... I can achieve around 350-400MB/s read/write on Nexenta... (which I know still isn't the best you can get at all)

So... to sum up a brain dump... is this a limitation of ZEVO, or some weirdness caused by my USB 3.0 enclosure bundled with my Mac etc?

Thanks.
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Re: ZEVO RAIDZ read/write performance over USB 3

Post by si-ghan-bi » Thu Oct 18, 2012 8:39 am

I cannot answer your question, but: 8x RAIDZ? Is it really RAIDZ or RAIDZ2? 8x RAIDZ is not very safe.
Which model of enclosure are you using? does it show the internal disks as single ones? I ask because I recently checked some FW800 enclosures but they always offered the internal disks as one single unit (or so I understood from the datasheets).

Concerning your question, on other configurations RAIDZ is faster than a single drive: http://hardforum.com/showthread.php?p=1036495014
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Re: ZEVO RAIDZ read/write performance over USB 3

Post by mikearma10 » Thu Oct 18, 2012 8:48 am

hi si-ghan-bi.

I have 8 individual disks on a single vdev, split over 2 physical sata controllers. These are attached to the host via USB 3.0 as individual disks, and are then put into a RaidZ1 pool, offering single-disk redundancy.

I'm a bit of a ZFS power user, so i'm aware of how to tweak my setup to get the best performance, however I wanted to know if there were any performance limitations with ZEVO?
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Re: ZEVO RAIDZ read/write performance over USB 3

Post by grahamperrin » Thu Oct 18, 2012 10:05 am

mikearma10 wrote:… expecting much larger numbers …


RAID-Z and USB3 discussed under: Performance Observation
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Re: ZEVO RAIDZ read/write performance over USB 3

Post by NakkiNyan » Sat Oct 20, 2012 7:27 pm

Performance of ZEVO seems to just be the norm. My setup is 4 disks in a RAIDz and 3 Disks in a RAIDz (current) over USB3 like yours. Both are terrible and are easily beat by a single HFS+ or ZFS disk so I have to say ZEVO is security only. MacZFS was much faster, real RAID speed, but so outdated and prone to way too many issues for me to recommend it as a real alternative.

Post your info again on the performance observation thread so we can keep track of the trends.
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