I have a script that performs backups for an

application.  Part of this script is a snapvault

of volumes with just Luns.  After the snapvault

finishes, I run a “snap delta” on the snapvault

target vol to determine the time span between

the most recent and oldest snapshots/backups. 

This is  check to make sure snapvaults are working.  

Sometimes after a lot of changes on the lun, and thus

a large snapvault operation, the snap delta can run for hours!!! 

 

All filers are:

  IBM N2857 (NetApp FAS2240)

  Data ONTAP Release 8.1.2P1 7-Mode

 

For example, here is the snapstatus of a snapvault after it

completed.  It took 17m and transferred 6.4gb.  The qtree

contains about 5 luns totaling to about 450GB.

 

 Source:                 xxxx:/vol/v_asdf_db/q_asdf_db

 Destination:            yyyy:/vol/v_asdf_db/q_asdf_db

 Status:                 Idle

 Progress:               -

 State:                  Snapvaulted

 Lag:                    00:20:10

 Mirror Timestamp:       Tue Dec 24 16:39:33 EST 2013

 Base Snapshot:          yyyy(1896301030)_v_asdf_db-base.0

 Current Transfer Type:  -

 Current Transfer Error: -

 Contents:               Replica

 Last Transfer Type:     Update

 Last Transfer Size:     6450652 KB

 Last Transfer Duration: 00:16:59

 Last Transfer From:     xxxx:/vol/v_asdf_db/q_asdf_db

 

After the above snapvault, the script ran a “snap delta”

on vol xxxx:/vol/v_asdf_db  (snapvault target). 

The cmd took +2hr to run!!!

 

  (from my script – note the start and end time stamps in form yyyymmddhhmmss)

 ====> CheckSnapAge - Start     20131224171935

 ==> cmd =  rsh yyyy -n snap delta v_asdf_db v_asdf_db.31

 v_asdf_db.31 Active File System   989985036      9d 17:51  4233243.016

 ====> CheckSnapAge - End     20131224193203

 

In this case, the snapvault target spans 9 days of

backups.  To determine this took +2 HOURS!

 

The snapvault  target isn’t getting hit very hard at all,

so resources don’t appear to be the limitation.

 

I’ve looked for other ways to determine

The time span of the snaps, but haven’t come up with any.

{The dates on a “snap list” don’t have the year!)

 

Q)  Why can a “snap delta” run a very long time (but not always)?

 

 

Thanks for any thoughts!

 

Rick

 

 

 

 

 

 

 

 

 

 

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