RBD-Mirror - Journal location

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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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