[DRBD-user] csums-alg,verify-alg algorithm

大川敬臣 yoshiomi-okawa at kccs.co.jp
Tue Aug 29 03:28:40 CEST 2017

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


I'm planning to build two MySQL DB servers that synchronized by DRBD 9.0
with RHEL 7.3.
I want to enable checksum-based synchronization by adding "csums-alg
<algorithm>" to drbd.conf.
After I read user's guide [5.11. Configuring checksum-based
synchronization], I had a simple question.

The user's guide said :
"<algorithm> may be any message digest algorithm supported by the kernel
crypto API
  in your system’s kernel configuration.
  Normally, you should be able to choose at least from sha1, md5, and
crc32c."

My question is , Is there recommendation algorithm for DB server?
The algorithms (sha1, md5, crs32) are king of old ones. Can I use sha256?
Is there some reason that sha256 is not used?

Please give me any adovices.

Thanks,
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