[ceph-users] how to test journal?

Rudi Ahlers rudiahlers at gmail.com
Tue Nov 21 00:52:43 PST 2017


I didn't see where you said there is no journal on bluestore.

Maybe I'm confusing the terminology. I have created a DB and WAL device for
my Bluestore, but I presume that's not a journal (anymore?).

This is how I set it up this time: ceph-disk prepare --bluestore /dev/sdc
--block.wal /dev/sde --block.db /dev/sde

Apart from "ceph grafana", which I can't install at this stage since the
cluster isn't ready yet, how else can I test the SSD cache drives?

On Tue, Nov 21, 2017 at 10:37 AM, Christian Balzer <chibi at gol.com> wrote:

> On Tue, 21 Nov 2017 10:23:20 +0200 Rudi Ahlers wrote:
> > Hi,
> >
> > Is it possible to test the CEPH journal to see if it performs optimally?
> >
> You're using bluestore, as I said before, there is no journal.
> The SSDs you're using are top of the line, perfectly suited for what
> you're using them for.
> > And, how can I see how much data is being cached?
> >
> Nothing gets cached per se with bluestore.
> As for utilization, there were values for the journal, AFAIK there isn't
> anything for the DB stuff at this point.
> In general, google "ceph grafana", you will REALLY want to monitor a ceph
> cluster this way.
> --
> Christian Balzer        Network/Systems Engineer
> chibi at gol.com           Rakuten Communications

Kind Regards
Rudi Ahlers
Website: http://www.rudiahlers.co.za
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