Performance numbers for DRBD

This post shows performance numbers for a pair of Dell PowerEdge R720 (0VWT90), with 24 logical CPUs (E5-2640 0 @ 2.50GHz) and storage on a Fusion-io ioDrive2 (1.2TB).

Typical values without DRBD (repeated a few times, nearly no variation):

#

Reading:

# dd if=/dev/fioa of=/dev/zero bs=16M count=1k iflag=direct
1024+0 records in
1024+0 records out
17179869184 Bytes (17 GB) copied, 12.2085 s,

1.4 GB/s

#

Writing:

# dd of=/dev/fioa if=/dev/zero bs=16M count=1k oflag=direct
1024+0 records in
1024+0 records out
17179869184 Bytes (17 GB) copied, 16.3737 s,

1.0 GB/s

#

FIO random-read:

# fio randon-read.fio
random-read: (g=0): rw=randread, bs=4K-128K/4K-128K,
    ioengine=libaio, iodepth=1
...
Run status group 0 (all jobs):
  READ: io=16384MB, aggrb=1235.6MB/s, minb=79072KB/s,
    maxb=82409KB/s, mint=12724msec, maxt=13261msec

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