Re: RBD journal feature

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Hello Jason,

 

Interesting, I used ‘rados ls’ to view the SSDPOOL and can’t see any objects. Is this the correct way to view the journal objects?

rbd feature enable SLOWPOOL/RBDImage journaling --journal-pool SSDPOOL

The symptoms that we are experiencing is a huge decrease in write speed ( 1QD 128K writes from 160MB/s down to 14MB/s ). We see no improvement when moving the journal to SSDPOOL ( but we don’t think it is really moving )

Kind regards,

Glen Baars

 

From: Jason Dillaman <jdillama@xxxxxxxxxx>
Sent: Saturday, 11 August 2018 11:28 PM
To: Glen Baars <glen@xxxxxxxxxxxxxxxxxxxxxx>
Cc: ceph-users <ceph-users@xxxxxxxxxxxxxx>
Subject: Re: [ceph-users] RBD journal feature

 

On Fri, Aug 10, 2018 at 3:01 AM Glen Baars <glen@xxxxxxxxxxxxxxxxxxxxxx> wrote:

Hello Ceph Users,

 

I am trying to implement image journals for our RBD images ( required for mirroring )

 

rbd feature enable SLOWPOOL/RBDImage journaling --journal-pool SSDPOOL

 

When we run the above command we still find the journal on the SLOWPOOL and not on the SSDPOOL. We are running 12.2.7 and all bluestore. We have also tried the ceph.conf option (rbd journal pool = SSDPOOL )

Has anyone else gotten this working?

The journal header was on SLOWPOOL or the journal data objects? I would expect that the journal metadata header is located on SLOWPOOL but all data objects should be created on SSDPOOL as needed. 

 

Kind regards,

Glen Baars

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--

Jason

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