[PVE-User] I/O issues

[Shain Miley]

Just an FYI...

I installed the new PERC raid cards and I getting better numbers for the 
'FSYNCS/SECOND' test now.

proxmox:/home/smiley# pveperf
CPU BOGOMIPS:      42564.48
REGEX/SECOND:      671808
HD SIZE:           68.41 GB (/dev/pve/root)
BUFFERED READS:    141.97 MB/sec
AVERAGE SEEK TIME: 4.98 ms
FSYNCS/SECOND:     2545.27

Shain









Shain Miley wrote:
> Well the version does not seem to make a difference much at all:
>
> proxmox_1.1:/# pveperf
> CPU BOGOMIPS:      42564.52
> REGEX/SECOND:      739582
> HD SIZE:           68.41 GB (/dev/pve/root)
> BUFFERED READS:    122.05 MB/sec
> AVERAGE SEEK TIME: 5.05 ms
> FSYNCS/SECOND:     150.74
>
>
> proxmox_1.3:/# pveperf
> CPU BOGOMIPS:      42564.51
> REGEX/SECOND:      663579
> HD SIZE:           68.41 GB (/dev/pve/root)
> BUFFERED READS:    112.45 MB/sec
> AVERAGE SEEK TIME: 5.08 ms
> FSYNCS/SECOND:     153.96
>
> I ran pveperf on another machine and I got these numbers:
>
> CPU BOGOMIPS:      39904.42
> REGEX/SECOND:      797648
> HD SIZE:           130.32 GB (/dev/sda2)
> BUFFERED READS:    120.10 MB/sec
> AVERAGE SEEK TIME: 5.33 ms
> FSYNCS/SECOND:     3069.82
>
> It looks like the slower machines are using:
>
> 300G, Serial Attached Scsi.10k, 2.5, Seagate Firefly
>
> and the faster one (FSYNCS/SECOND) are using these:
>
> 146G, Serial Attached SCSI, 15K, 3.5, Seagate, 15K
>
> The faster systems are using a different raid controller and the 
> megaraid_sas diver (vs mptsas in the slower system) as well...so I can 
> only really wait on the PERC 6I RAID card to get here and test it.
>
> Now I am wondering if it is not the RAID card but the drives that are 
> the issue...or a combination of both.  Should 10K SAS drives give 
> better numbers then 'FSYNCS/SECOND:     153.96'?
>
>
> Thanks,
>
> Shain
>
>
>
>
> Martin Maurer wrote:
>>> No these are not SSD's.  They are SAS drives.  I am going to try an
>>> install of 1.1 on one of these DELL's then upgrade to 1.2 and then to
>>> 1.3 and run pveperf each time.  I found another machine v1.1 withe the
>>> same  RAID card and the numbers are not as bad as the ones from 1.3.  I
>>> am wondering it is some change in the kernel that is responsible for 
>>> the
>>> poor performance.
>>>
>>> I will post the numbers in a few hours so I can get some feedback.
>>>
>>> Thanks,
>>>
>>> Shain
>>>     
>>
>>
>> I just want to show you the results you can get with SSD, just FYI - 
>> our results with the Samsung ssd.
>> Sorry for the unclear comment,
>>
>> Br, martin
>>
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>>   
>
>