[ceph-users] how to test journal?

Rudi Ahlers rudiahlers at gmail.com
Thu Nov 23 13:20:32 PST 2017


So is there any way, through some commands, that I can see how many objects
go through the WAL & DB devices, and how optimal is performs?

On Tue, Nov 21, 2017 at 10:52 AM, Rudi Ahlers <rudiahlers at gmail.com> wrote:

> Hi,
>
> 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
>



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