Our NetApp filer shows huge amounts of lag for snapvault operations. What could be possible causes of such large snapshot lag?
Snapvault is ON.
Source Destination State Lag Status
home:/vol/home/ vault1:/vol/home_backup/ Source 1602:06:04 Idle
home:/vol/h_root/- vault1:/vol/home_backup/h_root Source 1578:07:40 Idle
Listing of the .snapshot directory reveals an mtime of Dec 2, even on directories where the live filesystem has had modified files since that date.
drwx--x--x 13 user staff 8192 Dec 2 17:35 Feb-01
A snapvault status -l reveals the following information:
Snapvault is ON.
Source: home:/vol/home/
Destination: vault1:/vol/home_backup/
Status: Idle
Progress: -
State: Source
Lag: 1602:15:24
Mirror Timestamp: Fri Dec 2 00:01:56 PST 2011
Base Snapshot: sv.7
Current Transfer Type: -
Current Transfer Error: could not read from socket
Contents: -
Last Transfer Type: -
Last Transfer Size: 28618316 KB
Last Transfer Duration: 04:02:46
Last Transfer From: -
Source: home:/vol/h_root/-
Destination: vault1:/vol/home_backup/h_root
Status: Idle
Progress: -
State: Source
Lag: 1578:17:00
Mirror Timestamp: Sat Dec 3 00:00:20 PST 2011
Base Snapshot: sv.7
Current Transfer Type: -
Current Transfer Error: could not read from socket
Contents: -
Last Transfer Type: -
Last Transfer Size: 1488 KB
Last Transfer Duration: 00:00:04
Last Transfer From: -
On the destination end, we have this output for snapvault status:
Source Destination State Lag Status
home:/vol/home/ vault1:/vol/home_backup/ Snapvaulted 1602:24:40 Quiescing
home:/vol/h_root/- vault1:/vol/home_backup/h_root Snapvaulted 1578:26:16 Quiescing
Both source and destination filers are running NetApp Release 8.0.2.
