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How does this sound?

vipzz
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How does this sound?

Hi All,

Got my ReadyNAS ultra 4 for about 2 weeks now and I must say i'm pretty happy so far 😄
Just did a couple of read and write tests and thought i'd share them with the community 🙂

At first I did a couple of drag and drop tests from my Mac Mini and ReadyNAS and vice versa. The Mac Mini is connected over GE and the ReadyNAS is only connected via 1 GE link.
On both the read from NAS and write from NAS i got about 50 MB/s

Then I tried it using a RAMDISK on the Mac Mini thinking that the built in HDD could be a bottleneck for testing and what i found was incredible. On the read test I now got 116.1MB/s with peaks of over 126.6MB/s and on the write tests I got 48MB/s does that sound about OK? For the read tests i'm pretty much at the max for 1GE link but the on the writes i get about half the speed I got on read. Does that sound about normal?

I'm using 3 Samsung Spinpoint F4 2TB drives in X-RAID 2. Does adding one more disk do anything with the performance? Does it help or hurt it?

Cheersss,

Sander
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dbott67
Guide

Re: How does this sound?

vipzz wrote:
On the read test I now got 116.1MB/s with peaks of over 126.6MB/s

Sweet!

vipzz wrote:
on the write tests I got 48MB/s


Performance will always be limited by the slowest bottleneck. As you've found when creating a RAM disk, you can really see that a single non-RAID desktop system has pretty slow disk I/O compared to the ReadyNAS. I suspect that you may be hitting some sort of bottleneck on your Mac Mini. Maybe you need to buy another Utra to test performance! :wink:

I've written an article on some of the factors that come into play when testing performance: http://home.bott.ca/webserver/?p=363

vipzz wrote:
Does adding one more disk do anything with the performance? Does it help or hurt it?


More disks = more speed 😎 - viewtopic.php?f=21&t=54618#p310625

StephenB wrote:
Ok, I now have 4 disks installed, which I added one at a time, waited for the volume expansion to complete, and then tested.

Bonnie (add-on disk diag) reported

1 disk - 59.7 MB/s
2 disks - 110 MB/s
3 disks - 219 MB/s
4 disks - 319 MB/s

So the disk throughput definitely goes up as you add more disks.

However, the iometer speed did not change on my Windows 7 machine. No matter how many drives were installed, I still see 55-60 MB/s of read performance, and 80-83 MB/s of write performance. So there is more investigation needed on that.
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