Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> fix your local io subsystem. > fix your local io subsystem driver. > > check > local io subsystem, > (battery backed) write cache enabled? Yes, I did that yesterday, I got from 13 MB/Sec to 16 MB/Sec. Better, but still not good. > raid resync/rebuild/re-whatever going on at the same time? nope, RAID has been built and is steady. > does the driver honor BIO_RW_SYNC? errr ... how can I check that? /proc/driver/cciss/cciss0 does not reveal anything about that. > does the driver introduce additional latency > because of ill-advised "optimizations"? I use a stock SLES 10 SP1 cciss driver. I did understand that the I/O scheduler is not the best one. Perhaps you are referring to that? > if local io subsystem is ok, > but DRBD costs more than a few percent in throughput, > check your local io subsystem on the other node! That node is identical to the other one. > if that is ok as well, check network for throughput, > latency and packet loss/retransmits. scp gives me about 70 MB/Sec, so my guess is that things are more likely related to drbd and local io. > only if all of that seems ok too, > check drbd configuration. > > > Of course, I am inclined to advise an upgrade to SP2, which might help > > > with a newer cciss driver ;-) > > a-ha. since I use OES2 which is not supported on SP2, I'm somewhat reluctant on installing the kernel from SP2. Novell support will most likely be gone when I do this ... thx again, Bart