Bug #54576: cache tier set proxy faild - RADOS - Ceph

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Bug #54576

open

cache tier set proxy faild

Added by changzhi tan about 2 years ago. Updated about 1 year ago.

Status:

Pending Backport

Priority:

Normal

Assignee:

Category:

Tiering

Target version:

% Done:

100%

Source:

Tags:

backport_processed

Backport:

quincy, pacific

Regression:

Severity:

2 - major

Reviewed:

Affected Versions:

ceph-qa-suite:

Component(RADOS):

Pull request ID:

45409

Crash signature (v1):

Crash signature (v2):

Description

When I set the proxy mode to remove a writeback cache according to the official documentation [[https://docs.ceph.com/en/latest/rados/operations/cache-tiering/]],
an error occurred:

[root@controller-1 mon]# ceph osd tier cache-mode cachepool proxy
Invalid command: proxy not in writeback|readproxy|readonly|none
osd tier cache-mode <pool> writeback|readproxy|readonly|none [--yes-i-really-mean-it] : specify the caching mode for cache tier <pool>
Error EINVAL: invalid command

Related issues 2 (1 open — 1 closed)

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Updated by Neha Ojha about 2 years ago

Project changed from mgr to RADOS

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Updated by changzhi tan about 2 years ago

According to the description of the official website document:
REMOVING A WRITEBACK CACHE
Since a writeback cache may have modified data, you must take steps to ensure that you do not lose any recent changes to objects in the cache before you disable and remove it.
Change the cache mode to proxy so that new and modified objects will flush to the backing storage pool.
ceph osd tier cache-mode {cachepool} proxy
For example:
ceph osd tier cache-mode hot-storage proxy

I think proxy mode should stay, otherwise cache pool will still write data.

fix in https://github.com/ceph/ceph/pull/45409

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