Re: Ceph OSD journal utilization

[Nick Fisk <nick@xxxxxxxxxx>]

There is a journal_bytes counter for the OSD, or the journal_full counter will show if you have ever filled the journal.

 

From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of David Turner
Sent: 20 June 2016 17:02
To: EP Komarla <Ep.Komarla@xxxxxxxxxxxxxxx>; ceph-users@xxxxxxxxxxxxxx
Subject: Re: Ceph OSD journal utilization

 

If you want to watch what a disk is doing while you watch it, use iostat on the journal device.  If you want to see it's patterns at all times of the day, use sar.  Neither of these are ceph specific commands, just Linux tools that can watch your disk utilization, speeds, etc (among other things.  Both tools are well documented and easy to use.

---

From: ceph-users [ceph-users-bounces@xxxxxxxxxxxxxx] on behalf of EP Komarla [Ep.Komarla@xxxxxxxxxxxxxxx]
Sent: Friday, June 17, 2016 5:13 PM
To: ceph-users@xxxxxxxxxxxxxx
Subject: Ceph OSD journal utilization

Hi,

 

I am looking for a way to monitor the utilization of OSD journals – by observing the utilization pattern over time, I can determine if I have over provisioned them or not. Is there a way to do this? 

 

When I googled on this topic, I saw one similar request about 4 years back.  I am wondering if there is some traction on this topic since then.

 

Thanks a lot.

 

- epk

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