I had a need to transfer transfer a large amount of data between two
filers, one running OnTAP 5.3.4 and one running OnTAP 5.3.4R2. I ran a
level 0 ndmpcopy the day before the cutover, and then a level 1 the
night of the cutover, in order to minimize downtime. However, after
doing a compare of file sizes after the transfer, I found that some
files which had been modified since the level 0 did not have the proper
size on the destination.
Here is an example. Toaster1 is the source, and toaster2 is the
destination. I have added some comments in UPPER CASE.
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# cd /toaster1/test
# ls -l
total 80
-rw-r--r-- 1 root other 37817 Jan 31 15:54 testfile
SIZE OF ORIGINAL FILE IS 37817 BYTES.
# rsh toaster1 snap create vol0 testndmp
creating snapshot....................................
# ndmpcopy toaster1:/vol/vol0/.snapshot/testndmp/test toaster2:/vol/vol0/test -level 0
Password:
Connecting to toaster1.
Connecting to toaster2.
toaster1: CONNECT: Connection established.
toaster2: CONNECT: Connection established.
toaster1: LOG: DUMP: toaster1: LOG: Using subtree dump
toaster1: LOG: DUMP: toaster1: LOG: Date of this level 0 dump: Mon Jan 31 15:55:38 2000.
toaster1: LOG: DUMP: toaster1: LOG: Date of last level 0 dump: the epoch.
[NORMAL LOOKING DUMP/RESTORE OUTPUT]
toaster1: LOG: DUMP: toaster1: LOG: DUMP IS DONE
toaster1: HALT: The operation was successful!
Waiting for toaster2 to halt too.
toaster2: HALT: The operation was successful!
The transfer is complete.
Elapsed time: 0 hours, 0 minutes, 37 seconds.
# rsh toaster1 snap delete testndmp
deleting snapshot....................................
# cd /toaster2/test
# ls -l
total 68928
-rw-r--r-- 1 root other 37817 Jan 31 15:54 testfile
-rw-rw-rw- 1 root root 35213312 Jan 31 15:57 restore_symboltable
SIZE OF COPY IS 37817 BYTES, AS EXPECTED.
# cd /toaster1/test
# vi testfile
# ls -l
total 80
-rw-r--r-- 1 root other 37639 Jan 31 16:02 testfile
I HAVE MODIFIED THE FILE, SO IT IS NOW SHORTER (37639 BYTES).
# rsh -n toaster1 snap create vol0 testndmp
creating snapshot....................................
# ndmpcopy toaster1:/vol/vol0/.snapshot/testndmp/test toaster2:/vol/vol0/test -level 1
Password:
Connecting to toaster1.
Connecting to toaster2.
toaster1: CONNECT: Connection established.
toaster2: CONNECT: Connection established.
toaster1: LOG: DUMP: toaster1: LOG: Using subtree dump
toaster1: LOG: DUMP: toaster1: LOG: Date of this level 1 dump: Mon Jan 31 16:03:47 2000.
toaster1: LOG: DUMP: toaster1: LOG: Date of last level 0 dump: Mon Jan 31 15:55:38 2000.
[NORMAL LOOKING DUMP/RESTORE OUTPUT]
toaster1: LOG: DUMP: toaster1: LOG: DUMP IS DONE
toaster1: HALT: The operation was successful!
Waiting for toaster2 to halt too.
toaster2: HALT: The operation was successful!
The transfer is complete.
Elapsed time: 0 hours, 0 minutes, 38 seconds.
# cd /toaster2/test
# ls -l
total 68928
-rw-r--r-- 1 root other 37817 Jan 31 16:02 testfile
-rw-rw-rw- 1 root root 35213312 Jan 31 16:05 restore_symboltable
THE TIMESTAMP ON THE COPY HAS CHANGED, BUT IT IS STILL 37817 BYTES!
# cd /
# umount /toaster2
# mount toaster2:/vol/vol0 /toaster2
# cd /toaster2/test
# ls -l
total 68928
-rw-r--r-- 1 root other 37817 Jan 31 16:02 testfile
-rw-rw-rw- 1 root root 35213312 Jan 31 16:05 restore_symboltable
UNMOUNTED AND REMOUNTED TO MAKE SURE IT WASN'T A CACHING ISSUE.
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Can anyone tell me what I might have done wrong?
--
Deron Johnson
djohnson(a)amgen.com