[PVE-User] I/O issues

[Shain Miley]

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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