[Gluster-users] Horrible Gluster Performance

[Philip]

Am 13. April 2012 11:58 schrieb Jerker Nyberg <jerker at update.uu.se>:

> On Fri, 13 Apr 2012, Philip wrote:
>
>  Does anyone have an idea what could be the reason for such a bad
>> performance? 22 Disks in a RAID10 should deliver *way* more throughput.
>>
>
> You may already have done so but you can check IO-utilization of the
> devices with the flag "-x" to "iostat" like for example "iostat -x 2" over
> a two second interval. Check percentage utilization in the "%util" column
> to the right. If you are closer to 100 than 0 then they (the disk
> subsystem) might actually be busy.
>
> --jerker
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Here is the output (Outgoing bandwidth is currently at 380 Mbps):


Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz
avgqu-sz   await  svctm  %util
sda               0.00     0.00    0.00    0.00     0.00     0.00
0.00     0.00    0.00   0.00   0.00
sdb               1.00     0.00  129.50    0.00 42624.00     0.00
329.14     1.53   10.97   3.63  47.00

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.06    0.00    0.53    2.82    0.00   96.60

Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz
avgqu-sz   await  svctm  %util
sda               0.00     0.50    0.00    0.50     0.00     8.00
16.00     0.00    0.00   0.00   0.00
sdb               1.00     0.00  184.00   47.50 64084.00 29412.00
403.87     1.81    8.29   2.16  50.00

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.06    0.00    0.59    2.50    0.00   96.85

Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz
avgqu-sz   await  svctm  %util
sda               0.00     0.00    0.00    0.00     0.00     0.00
0.00     0.00    0.00   0.00   0.00
sdb               1.00     0.00  156.50    0.00 54944.00     0.00
351.08     1.30    8.28   2.62  41.00

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.21    0.00    0.48    1.61    0.00   97.70
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