Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
sorry if that might get double-posted ... I used wrong sender address on
initial reply ...
------
Hello,
On 01/19/2012 07:56 AM, Matthieu Lejeune wrote:
> Hello,
>
> I have a primary/secondary node with 2 ressources.
> When I watch the i/O performance i look some think like this :
>
> When I watch the physical drive utilisation :
>
> root at relax:~# iostat -x /dev/sda 1
> Linux 2.6.32-5-amd64 (relax) 01/19/2012 _x86_64_ (16 CPU)
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.02 0.00 1.09 0.02 0.00 98.87
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> avgrq-sz avgqu-sz await svctm %util
> sda 220.78 700.91 555.52 374.88 20794.66 21227.05
> 45.16 1.54 1.66 0.42 38.87
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.04 0.00 0.17 0.00 0.00 99.79
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> avgrq-sz avgqu-sz await svctm %util
> sda 186.00 48.00 211.00 162.00 15392.00 2624.00
> 48.30 0.03 0.09 0.06 2.40
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.00 0.00 0.29 0.00 0.00 99.71
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> avgrq-sz avgqu-sz await svctm %util
> sda 197.00 9.00 379.00 117.00 19472.00 1172.00
> 41.62 0.15 0.31 0.19 9.60
>
> When I watch the drbd device utilisation :
>
> root at relax:~# iostat -x /dev/drbd0 1
> Linux 2.6.32-5-amd64 (relax) 01/19/2012 _x86_64_ (16 CPU)
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.02 0.00 1.09 0.02 0.00 98.87
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> avgrq-sz avgqu-sz await svctm %util
> drbd0 0.00 0.00 775.16 1016.47 20729.96 21174.70
> 23.39 0.94 5.51 0.56 99.85
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.00 0.00 0.56 0.00 0.00 99.44
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> avgrq-sz avgqu-sz await svctm %util
> drbd0 0.00 0.00 426.00 104.00 15648.00 1262.00
> 31.91 5.19 0.15 1.87 99.20
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.00 0.00 0.56 0.00 0.00 99.44
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> avgrq-sz avgqu-sz await svctm %util
> drbd0 0.00 0.00 404.00 148.00 15888.00 1872.00
> 32.17 5.78 0.33 1.80 99.60
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.00 0.00 0.31 0.00 0.00 99.69
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> avgrq-sz avgqu-sz await svctm %util
> drbd0 0.00 0.00 398.00 117.00 15632.00 1736.00
> 33.72 5.28 0.10 1.94 100.00
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.00 0.00 0.24 0.00 0.00 99.76
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> avgrq-sz avgqu-sz await svctm %util
> drbd0 0.00 0.00 406.00 106.00 15376.00 1382.00
> 32.73 5.07 0.17 1.92 98.40
>
> I don't understand why my drbd device is at 100 %util.
>
> This is my ressource configuration : There are a raid 0 hardware with 12
> sas 15k drives.
So think you should get higher write?? performance from your setup ...
what are your current benchmarking results?
Looking at your config I suggest you read the performance tuning chapter
in the DRBD user guide ... assuming you have a raid controller with non
volatile cache and 10GBit interconnect you should really get quite near
to native speed with DRBD ....
Regards,
Andreas
--
Need help with DRBD?
http://www.hastexo.com/now
>
> resource data {
> protocol C;
>
> startup {
> wfc-timeout 0;
> }
>
> disk {
> on-io-error detach;
> }
>
> syncer {
> rate 20M;
> verify-alg md5;
> }
>
> on surtax {
> device /dev/drbd0;
> disk /dev/sda;
> address 10.1.42.11:7788;
> meta-disk internal;
> }
>
> on relax {
> device /dev/drbd0;
> disk /dev/sda;
> address 10.1.42.12:7788;
> meta-disk internal;
> }
> }
>
> What's wrong on my configuration ?
>
> Thank's
>
> Matthieu
>
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
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