hello,
we add the following parameter in drbd.conf
disk {
...
max-bio-bvecs 1;
...
}
and ...
# echo 4 > /sys/block/sdb/queue/max_sectors_kb
now, the performance of the 3ware 9550 is very slow
# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 8472 MB in 2.00 seconds = 4246.06 MB/sec
Timing buffered disk reads: 130 MB in 3.04 seconds = 42.81 MB/sec
I've applied the standard 3ware tuning values
echo 128 > /sys/block/sda/queue/max_sectors_kb (default 128)
/sbin/blockdev --setra 16384 /dev/sda
and the performance goes to
# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 8152 MB in 2.00 seconds = 4083.90 MB/sec
Timing buffered disk reads: 828 MB in 3.01 seconds = 275.36 MB/sec
can we change backwards max_sectors_kb to 128
without to get the same error?
Best Regards
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