Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Tue, 19 Nov 2013 14:29:32 +0100 "FDS | Forensik Data Services" <office at fds.at> wrote: > Just clarifying my understanding of an UpToDate-Status of a DRBD > Resource in Dual Primary Mode on 2 nodes. > Does a MD5-Hash calculation of both resources lead to equal MD5 > values? That depends. Prerequisites: - Both primaries are unmounted. - Both primaries are completely synced from the os/fs point of view. (That is "sync" has been run and thus all write-buffers are cleared.) Then an md5-hash of the drbd-device on both machines should return the same. Also md5-hashes of all the underlaying devices should(*) return the same. (*) With internal meta-data, there could be differences in the meta-data. With external meta-data the md5-hash of the data partitions used by drbd should all be equal. But be aware that with md5 it seems as if there is a slight chance of hash-collisions, it might be the hashes are the same but the data on your disks is actually different. Better do your tests with a sha-sum:-P Have fun, Arnold PS: Afaik if your devices aren't unmounted and synced, the data on disk can be different for a variety of valid reasons. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 230 bytes Desc: not available URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20131119/49333f56/attachment.pgp>