Support Restrictions for upgrades for RADOS Gateway (RGW) on Red Hat Ceph Storage 5.2

Red Hat WILL NOT support upgrades of RADOS Gateway (RGW) Object clusters (single or multi-site) from Red Hat Ceph Storage 5.1 to Red Hat Ceph Storage 5.2

Red Hat Ceph Storage upgrades of RADOS Gateway (RGW) Object clusters (single or multi-site) from RHCS 5.0/5.0z4 or 4.3 to Red Hat Ceph Storage 5.2 WILL be supported.

Red Hat Ceph Storage does support newly installed clusters on RHCS 5.2 using object storage (RGW single or multi-site). These clusters are not susceptible to this issue.

Please see the following details regarding this upgrade supportability:

• During upgrade qualification of Red Hat Ceph Storage 5.2 from 5.1 an issue was encountered when attempting to pull bucket stats from a sharded bucket with an upgraded Red Hat Ceph Storage 5.2 RADOS Gateway. This led to a failure to return the stat information and the OSD returning a -ENOENT as it cannot find the named object.

2022-06-23T19:47:12.159+0000 7fa67a8f4700  1 -- 172.x.x.x:0/1740454332 <== osd.62 v2:172.x.x.x:6960/3896948115 10 ==== osd_op_reply(1945 .dir.89c388ce-97da-43e4-b51a-1f81222b7d11.23622.2.101 [call] v0'0 uv0 ondisk = -2 ((2) No such file or directory)) v8 ==== 197+0+0 (crc 0 0 0) 0x7fa670316040 con 0x55ed3a525c40
2022-06-23T19:47:12.159+0000 7fa68fbf3500 20 cls_bucket_head: CLSRGWIssueGetDirHeader() returned -2
error getting bucket stats bucket=bucket5 ret=-2

• This issue is caused by the RADOS Gateway generating the wrong object names when trying to read the bucket index shards on buckets that were sharded in RHCS 5.1. There are significant differences between 'get_bucket_index_objects' code from 5.1 to 5.2 which lead to a regression and this object access issue.
• This is documented as a This content is not included.known issue.
• Upgrades from Red Hat Ceph Storage 5.1 to Red Hat Ceph Storage 5.3 will be supported and will resolve this issue for customer running Red Hat Ceph Storage 5.1 currently and looking to upgrade.
• Any questions please contact Red Hat Customer support via the Customer Portal