Re: [DRBD-user] BUG: High I/O Wait and reduced throughput due to wrong I/O size on the secondary

2013-03-18 Thread Lars Ellenberg
On Sat, Mar 16, 2013 at 07:44:45PM +0100, Felix Zachlod wrote: I have to answer myself again. I tried reverting to drbd 8.3.11 on my test setup. This again leaded to some interesting observations. When running 8.3.11 on both my virtual machines the average request size lowers but it is by

Re: [DRBD-user] BUG: High I/O Wait and reduced throughput due to wrong I/O size on the secondary

2013-03-18 Thread Felix Zachlod
Hello Lars, thans for your reply. incompatibility with the raid card driver?! Did you tell us which driver that would be? Of course. These are LSI Megaraid SAS Cards of the type 9280 (8e and 4i4e) two of them in each node. # modinfo megaraid_sas description:LSI MegaRAID SAS Driver

[DRBD-user] BUG: High I/O Wait and reduced throughput due to wrong I/O size on the secondary

2013-03-16 Thread Felix Zachlod
I have to answer myself again. I tried reverting to drbd 8.3.11 on my test setup. This again leaded to some interesting observations. When running 8.3.11 on both my virtual machines the average request size lowers but it is by far not as low as 4k. This seems to be correct as according to