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Hi all I want to do some performance tests on kernel rbd, and I setup a ceph cluster with 4 hosts, every host has 20 osds, the journal of osds is on a separate SSD partition.
First I created 48 rbds and mapped them to six clients, 8 rbds for every clients, then I executed the following command to initialize rbd. dd if=/dev/zero bs=1M of=/dev/rbd1 I can initialize all 48 RBDs. second I created another 48 RBDs and mapped them to the six clients, so every client has 12 RBDs. the ‘rbd showmapped’ can get a right output, however when I initialize the later 48 RBDs as I did before, it cannot be successful. The error output : dd: writing `/dev/rbd10': No space left on device any idea will be appreciate, if you need more information, please let me know, thanks in advance. |
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