I've enabled RBD mirroring on my test clusters and it seems to be working well, my question is 'Can we store the RBD mirror journal on a different pool?'
Currently when I do something like rados ls -p sas I see rbd_data.a67d02eb141f2.0000000000000bd1 rbd_data.a67d02eb141f2.0000000000000b73 rbd_data.a67d02eb141f2.000000000000036d rbd_data.a67d02eb141f2.000000000000074e journal_data.75.a67d02eb141f2.175 rbd_data.a67d02eb141f2.0000000000000bb6 rbd_data.a67d02eb141f2.0000000000000bae rbd_data.a67d02eb141f2.0000000000000313 rbd_data.a67d02eb141f2.0000000000000bb3 Depending on how far behind the remote cluster is on sync, there are more or less of the journal entries. I am worried about the overhead of storing the journal on the same set of disks as the actual RBD images. My understanding is that enabling journaling is going to double the IOPS on the disks, is that correct? Any assistance appreciated Regards, Cory
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