Hi,
I'm doing test with rados bench, and I see constant writes to osd disks.
Is it the normal behaviour ? with write-ahead should write occur each 20-30 seconde ?
Cluster is
3 nodes (ubuntu precise - glibc 2.14 - ceph 0.47.2) with each node 1 journal on tmpfs 8GB - 1 osd (xfs) on sas disk - 1 gigabit link
8GB journal can handle easily 20s of write (1 gigabit link)
[osd]
osd data = /srv/osd.$id
osd journal = /tmpfs/osd.$id.journal
osd journal size = 8000
journal dio = false
filestore journal parallel = false
filestore journal writeahead = true
filestore fiemap = false
I have done tests with differents kernel (3.0,3.2,3.4) , differents filesystem (xfs,btrfs,ext4), forced journal mode to writeahead.
Bench were done write rados bench and fio.
I always have constant write since the first second of bench start.
Any idea ?
Regards,
-Alexandre
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