PowerFlex: Replication initial copy report x5-10 times higher transfer size

• When starting volume replication, the initial copy transfer of the volume might report x5-10 times higher than the actual volume size.
• In this specific example, the volume size was 9TB, and the initial copy transfer reported copying 45 TB.

Output of

"scli --query_all_replication_consistency_group --replication_consistency_group_name RCG_test":

Initial copy progress: 15%, Capacity: 6.8 TB (6944 GB) out of 45.0 TB (46080 GB)

Real volume size reported by replication.

scli --query_all_replicated_volumes

Volume ID: 4b23391500000070 Name: test_1 Size: 9.0 TB (9216 GB)
   Pair ID: a93a69610000001f (CG ID: aec3c6370000001d)

Real volume size and volume used capacity:

[root@host1 ~]# scli --query_volume --volume_name test_1
>> Volume ID: 4b23391500000070 Name: test_1
   Provisioning: Thin
   Size: 9.0 TB (9216 GB)
   Total base user data: 1.9 TB (1902 GB)
   Storage Pool 9229a8f700000000 Name: Pool01
   Protection Domain 7137c89e00000000 Name: PD01
   Creation time: 2023-10-09 05:09:13
   Number of Direct Snapshots: 18
   Class: default
   Reads:  5 IOPS 19.2 KB (19660 Bytes) per-second
   Writes: 68 IOPS 577.0 KB (590848 Bytes) per-second
   Data layout: Fine granularity
   Compression method: Normal
   Mappings:
      Host ID: f88028a800000013 Name: Esxi1 Host Type: SDC IP: 192.168.168.25 Access Mode: READ_WRITE
      Host ID: f88028a600000011 Name: Esxi2 Host Type: SDC IP: 192.168.176.23 Access Mode: READ_WRITE
      Host ID: f88028a700000012 Name: Esxi3 Host Type: SDC IP: 192.168.176.22 Access Mode: READ_WRITE
      Host ID: f88028a500000010 Name: Esxi4 Host Type: SDC IP: 192.168.160.24 Access Mode: READ_WRITE
   No SCSI reservations
   No Nvme reservations
   The volume is a source volume of Snapshot Policy: 7e28798400000001
   Migration status: Not in migration
   Doesn't use RAM Read Cache
   Replication info:
      Replication state: Being Replicated
   Volume NVMe Namespace ID: 113 

Verify a single volume being replicated output of.

"scli --query_all_replication_pairs":

CG Id: aec3c6370000001d CG Name: RCG_test
Peer System Name: test123 Direction: LOCAL_TO_REMOTE
    Local ID: a93a69610000001f Remote ID: 91991cb90000001f Copy Type: ONLINE_COPY Initial Copy State: DONE Name: (null)
    Local Volume ID 4b23391500000070 Remote Volume ID: 9c52719f00000058 Local Volume Name: test_1 Remote Volume Name: test_1_rep
    Initial Copy progress: 100% Local Activity State: REPLICATION_ENABLED 

Impact

 This is a cosmetic issue. There is no impact aside from the reporting of the larger than expected initial transfer size.

The issue has been identified as a software code defect in the calculation of the progress during the initial copy transfer.

There is no resolution currently.  This is a cosmetic issue and there is no impact.

The software code defect will be fixed in future versions.

Impacted Version

PowerFlex 3.x

PowerFlex 4.x