Bug 2076541

Summary:	Document Enhanced "Image cache state" section of "rbd status" (persistent writeback cache) in block device guide under section 2.19
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Preethi <pnataraj>
Component:	Documentation	Assignee:	Ranjini M N <rmandyam>
Documentation sub component:	Block Device Guide	QA Contact:	Preethi <pnataraj>
Status:	CLOSED CURRENTRELEASE	Docs Contact:
Severity:	high
Priority:	unspecified	CC:	rmandyam, vereddy
Version:	5.0
Target Milestone:	---
Target Release:	5.1z1
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:	2022-05-27 10:59:28 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Preethi 2022-04-19 10:09:49 UTC

Describe the issue: Document Enhanced "Image cache state" section of "rbd status" (persistent writeback cache) in block device guide under section 2.19

Describe the task you were trying to accomplish:
We need update the new changes made for rbd cache status in the block device guide under section 2.19

below BZs for reference

https://bugzilla.redhat.com/show_bug.cgi?id=1959178
https://docs.ceph.com/en/latest/rbd/rbd-persistent-write-log-cache/

rbd status output reference:
$ rbd status rbd/foo
Watchers:
        watcher=10.10.0.102:0/1061883624 client.25496 cookie=140338056493088
Persistent cache state:
        host: sceph9
        path: /mnt/nvme0/rbd-pwl.rbd.101e5824ad9a.pool
        size: 1 GiB
        mode: ssd
        stats_timestamp: Sun Apr 10 13:26:32 2022
        present: true   empty: false    clean: false
        allocated: 509 MiB
        cached: 501 MiB
        dirty: 338 MiB
        free: 515 MiB
        hits_full: 1450 / 61%
        hits_partial: 0 / 0%
        misses: 924
        hit_bytes: 192 MiB / 66%
        miss_bytes: 97 MiB


Suggestions for improvement:

Document URL: https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/5/html-single/block_device_guide/index#persistent-write-log-cache_block

Chapter/Section Number and Title: 2.19

Product Version: ceph version 
ceph version 16.2.7-105.el8cp

Environment Details:

Any other versions of this document that also needs this update:

Additional information:

Comment 2 Preethi 2022-04-19 12:03:01 UTC

Thanks Ranjini for the quick implementation. Looks good

Regards,
Preethi