Hi,
We are serving mp4 videos from cephfs, with lots of random read.
Here is a graph: http://elbandi.net/ceph/ceph_bandwidth.png
The issue is: there are +50% incoming bandwidth (osd -> cephfs mount, blue line) compared outgoing bandwidth (webserver -> internet, green area). the labels are swaped by the switch.
on the osd, there is a raid5 with 512k full stripe size.
Files layout on cephfs:
stripe_unit: 65536
stripe_count: 1
object_size: 524288 (== raid5 full stripe size, so one object live in one raid "block").
Why are incoming bandwidth higher than outgoing?
Elbandi
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