[DRBD-user] Secondary server works harder than primary

Chris.Gouveia at spirent.com Chris.Gouveia at spirent.com
Sat Jun 11 01:49:48 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Thank you for your reply. Enclosed are more accurate and consistent results:
Primary machine
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.16    0.00    1.19   15.70    0.00   82.94

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda              37.33        24.00       985.33         72       2956
sdb              34.67        21.33       954.67         64       2864
sdd              40.33        16.00       950.67         48       2852
md0             729.33        61.33      2890.67        184       8672

Secondary machine
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.04    0.00    0.28    0.00    0.00   99.68

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda             194.00         0.00       978.67          0       2936
sdb             199.67         0.00       990.67          0       2972
sdc             191.33         0.00       948.00          0       2844
md0             734.00         0.00      2916.00          0       8748

Would it be accurate to interpret that DRBD is issuing the same number of
requests to both servers, but for whatever reason the software RAID on
the secondary server is breaking up each request into smaller IO requests?

If so, would anyone have any suggestions on how to debug the software RAID
portion?

Thanks for everyone's time,
Chris Gouveia


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