airhins

樓上是指 NAS 接 gigabit lan 有 6xMByte 寫入速度，gigabit lan 有 500Mbit (6x * 8) 傳送率 50% bandwi ...
rkkc 發表於 2011-1-6 17:20

    I got 140MB/S up for RAID5, AFTER TUNING...(8GB SINGLE FILE SEQ. TEST)
4 X 1 TB (Run on ESXi VMFS)

rkkc

I got 140MB/S up for RAID5, AFTER TUNING...(8GB SINGLE FILE SEQ. TEST)
4 X 1 TB
airhins 發表於 2011-1-6 17:28

soft/hardware RAID5? local/network throughput?

airhins

If you run Windows, please forget MDADM.
but, if you are going to setup a nas, MDADM still is a good choice.
Why?
1. the bottleneck of lan (only 100MB/s)
2. After tweaking, soft-raid can be up to 200MB/s (4X1TB bare metal)
3. CPU is not really high, just about 30-60% (intel e3300 on 1.2GHz)
4. No need to pay more to upgrade your hardware controller
5. the more hardware controller speed, the more costs will be.

For you,

http://randomitblog.blogspot.com/2009/10/ubuntu-raid-tweak.html
(compatible for most Linux)
http://louwrentius.blogspot.com/ ... ize-benchmarks.html

airhins

回覆 12# rkkc


Virtualization: Intel E3300, 4GB Ram, 4x1TB Hitachi, Software Raid 5, Local, ESXi 4, VMFS, eager zeroed disk type, CentOS, LVM. Before tweaking, 100-120MB/s, 8GB Single File Seq. Test. After tweaking, up to 140MB/s during the same test.

Bare metal: Intel E3300, 6GB Ram, 4x1TB Hitachi, Software Raid 5, Local, CentOS, LVM. Before tweaking about 160MB/s, after tweaking, 200-240MB/s

All are Write Test...

airhins

回覆 13# HK-Steven

For MDADM only:

For Storage: 64K
For ISCSI (Run VM): 4K

rkkc

回復 13# HK-Steven

當然沒有定數，只是實際測試後，我通常定 stripe size 是 32KB: OS volume，128KB: data volume。

airhins

回覆 17# rkkc


    For MDADM:
I would like to refer this, and I tested that it also suitable for RAID 5
http://deinoscloud.wordpress.com ... ats-the-sweet-spot/

airhins

回復 17# rkkc


The IOPS would be reduced if your OS allocation unit is 4K

rkkc

回復 18# airhins

謝謝 ching 介紹測試方法，相信大部份原則也適用於其他 RAID 設備。