Hi Samuel, On 12/1/2021 11:54 AM, huxiaoyu@xxxxxxxxxxxx wrote:
Dear Cephers， We are running tons of Ceph clusters on Luminous with bluefs_allocator being bitmap, and when looking at Nautilus, 14.1.22, bluefs_allocator is now defaulting to hybrid. I am then wondering the follwoing: 1) what will be the advantage for using hybrid instead of bitmap (which seems to be working very well now)?
Generally it looks like hybrid allocator is faster than bitmap, especially when long continuous chunks to be allocated in a highly fragmented space. But there were also some complains about higher tail latencies caused by hybrid allocator, e.g. https://tracker.ceph.com/issues/52804
Hopefully this is fixed in the master and to be ported back to Octopus soon.
2) Is it saft to keep Nautilus with bluefs_allocator settting to bitmap?
yes, it's totally safe.
Cheers, samuel huxiaoyu@xxxxxxxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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