Performance CIFS/SMB on E350 8GB with ZFS mirror

[GoodWiesKapot]

Can someone tell what performance i can expect form this setup ?

MB/CPU: MSI E350DM-E33 @ 2x1,6 Ghz
RAM: 8GB
Disk: 2x2TB Western Digital Green WD20EARX config: ZFS mirror, 4k setor enabled.
NIC: Intel Gigabit CT Desktop Adapter
NIC/Client: Realtek RTL8111E with a mtu of 6000
Switch: TP-Link TL-SG1005D with support of jumo frames.

ZFS: kerneltune set to 8GB with preftech enabled
vdev.max_pending=1
vdev.min_pending=1
write_limit_override=1048576000 or 125MB/s
CIFS/SMB: protocol SMB2, nt1 doesnt work for me, slower performance
send/recieve size: 128480
aio enabled
large read/write enabled
Network: MTU set to 6000, same as client PC @ Windows 7 64 bit

This setup gives me about 50 to 70 MB/s read and write speeds with CIFS/SMB.

I have tested with FTP as well, the funny thing is it start at 100/110 MB/s read or write and within seconds it slowly drops to 40/50 MB/s and stays at that speed for the rest of the transfer...


Any advice would be helpfull... THNX

[Lee Sharp]

Add more drives. Seriously, you have essentially single drive speed, with some mirroring overhead. You put in 4 drives with zfs2 parity, and you will get double that speed. If you can somehow get 6, it will be much faster. If you have 8 drives, you will come close to saturating a gigbit nic, but you will need a lot more memory.

[GoodWiesKapot]

Sorry, but i dont see how adding more drives gives me more speed, it sounds more logical that with adding more drives the performance drops....How about adding one drive and make a raidz1 config with tree drives, would that result in better performance ?

[chrisf4lc0n]

Adding 1 more disk the same size will give you RaidZ1 configuration which is similar to RAID 5, that means you should get better performance in read, but you will definitely get the performance penalty in write because of the write data overhead. Lee Sharp is right, if you use 4 drives in ZFS2 Parity you are basically getting the speed of RAID 0 with the redundancy of RAID 1, the more drives you add the more stripping is getting done so more performance...

Imagine the you are living in ideal world and you are reading from 2 disks on which you could get the maximum of 30 Mb/s so you are effectively getting 60Mb/s.
Now add another 2 drives to the set so you will be reading from 4 drives in the same time so 4x30Mb/s=120Mb/s!
In real world however there are other things you have to take into account, so you will not get that much of a performance rise, but I would imagine you should get at least 30% better performance with ZFS2 Parity with 4 disks over just simple Mirror.

[raulfg3]

http://constantin.glez.de/blog/2010/01/ ... still-best

[GoodWiesKapot]

Thnx alot, im thinking of buying 1 extra disk of 2 TB and experiment with that. 3 way mirror vs Raidz1.

raulfg3, thnx for the article. That explains alot