Adaptec 2405

XServer said:
I'm going to build 4x1Tb RAID10 with subj, but have finded this post and been shocked :eek:

Does PVE 1.3 (with kernel 2.6.24) support hardware raid by Adaptec 2405 Controller? :o
Click to expand...

I just read the data sheet of adaptec 2405 and there is 128 mb cache on it but NO batteries backup - which is a REAL NO GO!

I never tested this on Proxmox VE Kernel and if its working or not - never use raid controller cache without BBU.
 
XServer said:
Hmm....
Look at this YOUR post. :(
It is not good to recommend untested hardware :confused:

Could you add this hardware to support in pve kernel, please?
Click to expand...

I do not recommend it in this post, I also pointed out that there is on BBU.

is it not working, do you tried it?
 
Is that with write cache on or off?

I just ordered a 2405 to test with at home. So am curious about the performance.

Read on a blog about setting the stripe size to 256kb with write cache disabled gives good performance also.
I still have to test that when my card arrives.
 
That's great :D.

Hope my 2405 arrives soon :).

* Is it save to turn the read cache on? Only write cache on gives problems with power failure wright? Think so, but just to be sure :).
 
Finally, our server is located in DC and here is amazing pveperf output at zero-load:
pvds1:/var/lib/vz/images# pveperf
CPU BOGOMIPS: 31923.86
REGEX/SECOND: 631743
HD SIZE: 94.49 GB (/dev/pve/root)
BUFFERED READS: 307.97 MB/sec
AVERAGE SEEK TIME: 7.61 ms
FSYNCS/SECOND: 135.96
DNS EXT: 81.67 ms
DNS INT: 68.61 ms (luxehost.net)
 
XServer said:
Finally, our server is located in DC and here is amazing pveperf output at zero-load:
pvds1:/var/lib/vz/images# pveperf
CPU BOGOMIPS: 31923.86
REGEX/SECOND: 631743
HD SIZE: 94.49 GB (/dev/pve/root)
BUFFERED READS: 307.97 MB/sec
AVERAGE SEEK TIME: 7.61 ms
FSYNCS/SECOND: 135.96
DNS EXT: 81.67 ms
DNS INT: 68.61 ms (luxehost.net)
Click to expand...

FSYNCS/SECOND: 135.96 is amazingly bad. looks like you have no cache. if you run database intense applications or other tools which needs fast fsyncs you will have low performance.

take a look on this thread, describing FSYNCS/SECOND in the case of our Proxmox Mail Gateway (Postfix, Postgres database).
 
solved.
CPU BOGOMIPS: 31923.86
REGEX/SECOND: 633724
HD SIZE: 94.49 GB (/dev/pve/root)
BUFFERED READS: 295.42 MB/sec
AVERAGE SEEK TIME: 7.40 ms
FSYNCS/SECOND: 697.21
DNS EXT: 69.91 ms
DNS INT: 67.64 ms (luxehost.net)

In ASM i was disable write cache for each harddrive. i have enabled it back, but in logical volume this param was still disabled.
 
Not bad, here's 4 300GB Western Digital VelociRaptors in Raid10, hanging off a 3Ware 9650SE with read/write cache enabled.

Code: 
mepve02:~# pveperf
CPU BOGOMIPS:      43182.54
REGEX/SECOND:      1029900
HD SIZE:           49.22 GB (/dev/pve/root)
BUFFERED READS:    242.13 MB/sec
AVERAGE SEEK TIME: 5.51 ms
FSYNCS/SECOND:     1780.86
DNS EXT:           55.37 ms
DNS INT:           0.75 ms (xxxx.local)

Performance is very good with this setup.
 
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