Change in vdsm[master]: mailbox: Decrease the chance of checksum failures

[Code Review]

From Dan Kenigsberg :

Dan Kenigsberg has posted comments on this change.

Change subject: mailbox: Decrease the chance of checksum failures
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Patch Set 2:

(1 comment)

https://gerrit.ovirt.org/#/c/73078/2//COMMIT_MSG
Commit Message:

Line 17: There is no way to write 4096 bytes atomically, so we cannot fix this
Line 18: issue. But we can decrease the chance of the failure by doing one write
Line 19: of 4096 bytes, instead of 8 writes of 512 bytes. There is still chance
Line 20: of failure since writing on the remote storage is probably done using
Line 21: 512 blocks, but the chance of reading incomplete write is much lower.
I suspect that this may also improve performance on modern storage, where the sector size is 4096 ?
Line 22: 
Line 23: Since both reading and writing was done using 512 bytes blocks, both
Line 24: were modified to use 4096 block size. The SPM mailbox is already writing
Line 25: replies using 4096 block size.