My first NAS (30TB usable) :)

It's the only way i found to post... I am sorry :?

Benchmark of OS raid

Benchmark of a single data disk

Benchmark of data raid 6

Sorry for the delay... i got problem with anti-spam... :lol:

When i ordered my data disk :twisted:

Cabling nightmare Attempt 1

I don't know why the cat of my girlfriend is so curious...

Maybe because he wanted to eat some cable

1 missing cable... i need to reorder 1 more.... I ordered 5 in case this cat eat another one....
After that, I realized cable was very too long.... so i ordered 25 cables shorter...

Cabling nightmare part 1 : 2 month :cry:

Why i say part 1? That's because I tried to use 4 port mutiplier to make visible all my disk to the OS. 4 sata port on a motherboard is not enough.
The solution I choosed has no smart data available and i was not able to not use it to simply add disk to my system.... hardware raid only.... but on 4 card... that's cheap...

So I bought my 3ware card on ebay. (2-3 weeks)
I bought my cable sas breakout on a web site. (1 month and half to receive all cables... back-order they said... When I orderer 3 of them, 4 cables was available)

Sorry I dont' want to open that case again to take a picture.... lol

But this look very sexy when building the array 8-)

I forget to tell I had a problem with my case...

1 backplane was defective.... I send it and they replaced it (2 weeks to send + 2 weeks to receive)

I have so much data to copy to it.... 33hours of copy over gigabyte network :shock:

Here's a preview of what i got 2 years ago... now it's over 4to of 30to max

When I do a copy over network at 4 MB/s, my disk go to 100% utilization and around 50% iowait.

# iostat -x 1

My memory is fulled with differed write.

I made a local copy to test, same result. So I can exclude network problem.

I tried to test if i get %wa in top while copying to null. I get 50% cpu and 0% wa. This seem not be hardware problem like motherboard or cpu.

# cat /dev/zero | bzip2 -c > /dev/null

Then I tested on read on my server via Ethernet. Both card was gigabytes.
The maximum I got over a file of 8go was 6mo/s. No load at all on server, IO utilization was under 5%.
I expected to get around 19-20mo/s like in benchmark or maybe just a little bit less with tcp/ip overhead.

I tried to ajust virtual memory config with no change in performance.

# sudo nano /etc/sysctl.conf
  vm.dirty_background_ratio = 50
  vm.dirty_ratio = 80

I saw no error concerning disk or OI in all log file (dmesg, faillog, messages, syslog, user.log, daemon.log and boot).

I saw than cache is not enabled on my raid card, so I tried to enabled it.

Zitat

# /usr/sbin/tw_cli /c0/u0 set cache=on
Setting Write Cache Policy on /c0/u0 to [on] ... Failed.
Parameter not changeable

After some research, I found than we can't enable cache if we don't have a BBU (Battery Backup Unit).
I don't think this will fix my problem but it will be better for sure! I am checking to order one, it's around 100$.

I know if I increase my RAM, i'll be able to push more data in a burst. But now I want to push around 4to to my server.
And i am limited for memory because my motherboard only have 2 slot.

Anybody can hint me how to fix this problem? How to increase IO performance?
If i can't increase IO performance, can I limit write to avoid to maximize disk utilization?
As soon I find a solution, i'll post it. 8-)

I love so much OMV, this saved me soo much time :mrgreen:

Zitat von "tekkbebe"

Nice work. Now you just need a small rack. :mrgreen:

Almost done. :lol:
I'll post it after his install
But I need to put my data first! I need to find a solution otherwise it will be very too long at 3MB/s

I installed a BBU for my hardware raid card, so i was able to activate write cache on controller.... I got 6 times more speed for 15$ :twisted:

Zitat von "demetris"

check if you have any realtek at eth0

What do you mean? realtek network driver?