snapshot uuid changes for snapshot residing on target volume if storage efficiency is enabled

[Tushar_Karande]

Hello,

    I'm posting this on behalf of customer for NetBackup 

   what we do in nutshell is

   1.we establish replication relationship between source and target volume

   2.call ontap.SnpamirrorTransfer() to enable replication ,we wait util we see transfer state is successful

   3.call  ontap.snapshot() on target volume and save attributes of snapshot residing on target volume

what we have observed is if  storage efficiency is enabled  for target volume 

- after replication is successful , storage efficiency runs and updates uuid of already existing snapshot on target volume

- Hence we have invalid uuid of snapshot as we have already picked up snapshot attributes mentioned at steps 3

- Due to this invalid uuid we fail to perform different operations like export/deport/delete operation for snapshot residing on target volume

How can we retrieve valid attributes of snapshot if storage efficiency is enabled on target volume using python SDK

we already have case #2010285475 opened ,respective support has asked to post query in this forum and get solution for this  

[AmitKerkar]

you are not allowing sufficient time to finish the replication. Storage efficiency operations take time to complete and get you new UUID.

you need to programmatically monitor the volume efficiency state  and the progress, say for 2 or  5 or 10 minutes

remember , your new valid UUIDs will be only present once the efficiency operation is complete. else you will always get stale IDs

[Tushar_Karande]

Hi Amit,

How do we track volume efficiency state using specific field

I can see below API  to fetch some volume  fields as below

curl -X GET "https://<mgmt-ip>/api/storage/volumes/<volume-uuid>?fields=efficiency.state,efficiency.compression.state,efficiency.deduplication.state" -H "Accept: application/json" 

[AmitKerkar]

put a timer/wait interval to check

volume.efficiency.state == "idle"

idle state would mean your efficiency op is  complete

[Tushar_Karande]

should we check

if efficiency is enabled on target volume
curl -X GET "https://<mgmt_ip>/api/storage/volumes/<vol_uuid>?fields=efficiency.state" -k

confirm that efficiency op_state is idle
curl -X GET "https://<mgmt_ip>/api/storage/volumes/<vol_uuid>?fields=efficiency.op_state" -k

[Tushar_Karande]

looks like this field is not available at API or I may be missing something here 

 curl -X GET "https://<mgmt_ip>/api/storage/volumes/<vol-uuid>?fields=volume.efficiency.state" -H "Accept: application/json" -k 
{
"error": {
"message": "The value \"volume.efficiency.state\" is invalid for field \"fields\" (<field,...>)",
"code": "262197",
"target": "fields"
}
}

[AmitKerkar]

can you try /api/storage/volumes/{uuid}/efficiency 

is there any possibility of you using "name" instead of "UUID". We know that name persists unlike the snapshot UUID

[Tushar_Karande]

As name suggests UUID has to be unique and hence persistant (can not be changed) and thats a very reason of its existence.. I have yet to encounter use case where UUID of any entity is non persistent (can be changed) . If my understanding is correct ,Ideally replication should have taken care of this for Snapshot UUIDs if storage efficiency is enabled on target volume 

As you mentioned ,efficiency field  returns below enclosure

% curl -X GET "https://<mgmt-ip>/api/storage/volumes/<vol_uuid>?fields=efficiency" -k --user user:pass -H "Accept: application/json"
{
"uuid": "<vol_uuid>",
"name": "<dest>",
"efficiency": {
"compression": "none",
"dedupe": "background",
"cross_volume_dedupe": "none",
"compaction": "none",
"schedule": "sun-sat@0",
"volume_path": "/vol/<dest>",
"state": "enabled",
"op_state": "idle",
"type": "regular",
"progress": "Idle for 14:28:15",
"last_op_begin": "Wed Mar 12 00:00:00 2025",
"last_op_end": "Wed Mar 12 00:00:00 2025",
"last_op_size": 0,
"last_op_state": "Success",
"has_savings": true,
"logging_enabled": true,
"policy": {
"name": "-"
},
"space_savings": {
"compression": 0,
"compression_percent": 0,
"dedupe": 0,
"dedupe_percent": 0,
"dedupe_sharing": 0,
"total": 0,
"total_percent": 0
},
"scanner": {
"state": "idle"
}
}
}%

which exact field we need to track and for what ideal value to confirm storage efficiency is completed 

as mentioned above I see probable fields here ,but you can confirm same   

curl -X GET "https://<mgmt_ip>/api/storage/volumes/<vol_uuid>?fields=efficiency.state" -k
curl -X GET "https://<mgmt_ip>/api/storage/volumes/<vol_uuid>?fields=efficiency.op_state" -k
curl -X GET "https://<mgmt_ip>/api/storage/volumes/<vol_uuid>?fields=efficiency.scanner.state" -k