Health_err only indicates that a request might block, not that it will. In the case of a scrub error, only requests made to the objects flagged as inconsistent in the failed PG will block. The rest of the objects in that PG will work fine even though the PG has a scrub error.
Depends on the error case – usually you will see blocked IO messages as well if there is a condition causing OSDs to be unresponsive.
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of ???
Sent: Friday, 4 August 2017 1:34 PM
To: ceph-users@xxxxxxxxxxxxxx
Subject: Does ceph pg scrub error affect all of I/O in ceph cluster?
Hi cephers,
I experienced ceph status into HEALTH_ERR because of pg scrub error.
I thought all I/O is blocked when the status of ceph is Error.
However, ceph could operate normally even thought ceph is in error status.
There are two pools in ceph cluster which are include seperate nodes.(volumes-1, volumes-2)
The OSD device which has problem is in volumes-1 pool.
I noticed that volumes-2 pool has no problem with operation.
My question is that all of I/O request are blocked when the ceph status is into error or it depends on error case?
Thank you!
John Haan
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