PBM 2.12 on MongoDB 8.0 Sharded Cluster – “storage is not initialized” + “get epoch: lookup: element not found”

MongoDB Percona Backup for MongoDB
1

I have a sharded MongoDB 8.0 cluster with 2 mongos + 3 config nodes and 2 shard replica sets (3 nodes each).
PBM 2.12 is installed on every mongod node and each PBM agent connects to its local mongod using the correct URI.

I applied PBM storage config separately to config RS, shard1 RS, and shard2 RS.
pbm config is correct everywhere - filesystem storage (also tried with S3 compatible Blackblaze storage) is initialized and identical on all replica sets.

But when I run a backup through mongos:

pbm backup ...

I always get:

get backup metadata: context deadline exceeded

And in every PBM agent log (config + shards) I repeatedly see:

storage is not initialized
get epoch: lookup: element not found

Cluster is healthy, agents authenticate fine, all nodes are reachable, and nothing is blocked.

I can’t understand why PBM thinks “storage is not initialized” when the storage config is already present on all replica sets.

I need help understanding why PBM cannot create the epoch or initialize storage metadata on MongoDB 8.0.

That’s the issue. Any leads will be appreciated!
Thank you for your time.

2

Hi and welcome to our forum!

PBM requires a shared storage (all nodes need to see the same volume or bucket) please check the steps to add a remote storage for more details.