mon,mds: make standby-replay state more capable #4
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Signed-off-by: Igor Fedotov <igor.fedotov@croit.io>
Signed-off-by: Igor Fedotov <igor.fedotov@croit.io>
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| int followables = mds_map.is_followable(rank); | ||
| if (followables < 2 ) { | ||
| dout(1) << " setting mds." << info->global_id | ||
| << " to follow mds rank " << rank << dendl; | ||
| fsmap.assign_standby_replay(info->global_id, fs.get_fscid(), rank); | ||
| do_propose = true; | ||
| changed = true; | ||
| break; | ||
| //break; |
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Is it about having at least 2 standby-replay mds?
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Generally this should be rather configurable but for now this allows up to 2 MDS-es in standby-replay mode.
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This allows 2 standby-replay daemons and permits cephfs scrubbing at standby-replay MDS.
To fully benefit from this PR one can use 'ceph mds freeze ' command to 'freeze' specific MDS. This leaves the latter in standby-replay mode permanently but lets other daemons to cycle through their states as designed. Hence FS keeps functioning properly with an additional standby-replay daemon. Which gets an ability to monitor FS in parallel this way.
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