Snapmirror transfering never ends

[StudentNetApp]

Hi,  I am new to NetApp, and facing issue SnapMirror transfer.

Background:

Recently, I faced an issue with the SnapMirror relationship due to network problems. After resolving the network issue and ensuring stability over a few weeks, I initiated the SnapMirror process again. However, the transfer seems to be stuck, and it never completes. Any idea?

Viewing Source Volume via Ontap system manager.

• Data Space Used: 32.69 TB
• Data Space Available: 11.99 TB
• Over Provisioned Space: 639.62 GB
• Snapshot Copies Space Used: 15.4 TB - an old snapshot from 2023-12-x when relationship was created but then was broken again. this could be the cause?
• Snapshot Copies Space Available: 0 Byte
• Snapshot Reserve Space: 621.64 GB
• Logical Space Used: 98.59 TB

Destination Volume detail:

• Data Space Used: 41.61 TB
• Data Space Available: 13.39 TB
• Over Provisioned Space: 0 Byte
• Snapshot Copies Space Used: 0 Byte
• Snapshot Copies Space Available: 0 Byte
• Snapshot Reserve Space: 0 Byte
• Logical Space Used: 41.61 TB

snapmirror show svm-backup:cifs_volX_n3_sata_vault -instance

• Source Path: cifs:volX_n3_sata
• Destination Path: svm-backup:cifs_volX_n3_sata_vault
• Relationship Type: XDP
• SnapMirror Schedule: Hourly
• SnapMirror Policy Type: Vault
• Mirror State: Uninitialized
• Relationship Status: Transferring
• Snapshot Progress: 102.1TB
• Total Progress: 102.1TB
• Healthy: false
• Unhealthy Reason: Scheduled update failed to start. (Volume svm-backup:cifs_volX_n3_sata_vault is not initialized.)
• Last Transfer End Timestamp: 03/26 10:13:37
• Relationship Capability: 8.2 and above
  Lag Time: -
  Identity Preserve Vserver DR: -
  Volume MSIDs Preserved: -
  Is Auto Expand Enabled: -
  Number of Successful Updates: 0
  Number of Failed Updates: 0
  Number of Successful Resyncs: 0
  Number of Failed Resyncs: 0
  Number of Successful Breaks: 0
  Number of Failed Breaks: 0
  Total Transfer Bytes: 0
  Total Transfer Time in Seconds: 0"

thanks in advance,

S

[cedric_renauld]

Hello

Have you try a break and initialize again ?

[StudentNetApp]

Hi,   Not yet, i aborted it afew times as it never finishes.

[TMACMD]

I have seen some replication take a lot of extra time.

Have you done a "snap list" on both the source and destinations?

Maybe it is transferring all the snapshots?

On the destiantion, look at "vol efficiency show"

Maybe ONTAP is doing some operation there.

[StudentNetApp]

There are 3 snapshots on the source, one is from Dec-2023 and two every day created.

on the destinations, there is no snapshot transfered yet and Storage efficiency is not enabled, probably it was missed to be enabled but now i get an error to enable it, it seems i must break the relationship as it would not end its transfer?

[cedric_renauld]

Hi,

For the Storage Efficiency, it's normal, the Destiantion Volume follow the source volume, but it's need to be snapmirrored befor 🙂

For the snapmirror, can you do a "snapmirror show -instance" to chek why the transfert was not done ?

[StudentNetApp]

I had to abort it as it never finished. The reason is that it was aborted.  it is supposed to transfer 40tb but 102tb transfered and still counting, for this reason i had to abort to figure out what is happening 🙂

[TMACMD]

It could be an ONTAP but. Have you updated recently? What code you on?

[StudentNetApp]

it wont update it as it is not fully initiated so it wont update it, i am on NetApp Release 9.7P22.