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Monday, March 25, 2013

Netapp Snapshot Management

 

This article explains the different commands related to Netapp Snapshot Management. 

Creating a test volume of 10gb to perform snapshot related operations 
geekyfacts-filer > vol create testvol aggr 10g
Creation of volume 'testvol' with size 10g on containing aggregate

geekyfacts-filer > df -h testvol
Filesystem total used avail capacity Mounted on
/vol/testvol/ 8192MB 1420KB 8190MB 0% /vol/testvol/
/vol/testvol/.snapshot 2048MB 0MB 2048MB 0% /vol/testvol/.snapshot
geekyfacts-filer >
Snapshot Create

geekyfacts-filer > snap list testvol
Volume testvol
working...

No snapshots exist.
geekyfacts-filer > snap create testvol testsnap
creating snapshot...

geekyfacts-filer > snap list testvol
Volume testvol
working...

%/used %/total date name
---------- ---------- ------------ --------
0% ( 0%) 0% ( 0%) Dec 19 01:02 testsnap
geekyfacts-filer >


Snapshot Rename



geekyfacts-filer > snap rename testvol testsnap snaptestgeekyfacts-filer > snap list testvol
Volume testvol
working...

%/used %/total date name
---------- ---------- ------------ --------
3% ( 3%) 0% ( 0%) Dec 19 01:02 snaptest
geekyfacts-filer >

Snapshot Delete


geekyfacts-filer > snap delete testvol snaptest
deleting snapshot...

geekyfacts-filer > snap list testvol
Volume testvol
working...

No snapshots exist.
geekyfacts-filer >

Snap Scheduling 


Scheduling automatic snapshot to keep 2 weekly, 2 daily, 8 hourly(taken at hours 8,12,16,20) online.

geekyfacts-filer > snap sched testvol 2 2 8@8,12,16,20
geekyfacts-filer > snap sched testvol
Volume testvol: 2 2 
8@8,12,16,20
geekyfacts-filer >


Snap Space Reservation


Default snapshot space reserve is 20% of the volume size 

geekyfacts-filer > snap reserve testvol
Volume testvol: current snapshot reserve is 20% or 2097152 k-bytes.


geekyfacts-filer > df -h testvol
Filesystem total used avail capacity Mounted on
/vol/testvol/ 8192MB 1796KB 8190MB 0% /vol/testvol/
/vol/testvol/.snapshot 2048MB 0MB 2048MB 0% /vol/testvol/.snapshot


Changing the snapshot reserve to 5% of the volume size 

geekyfacts-filer > snap reserve testvol 5

geekyfacts-filer > snap reserve testvol
Volume testvol: current snapshot reserve is 5% or 524288 k-bytes.


geekyfacts-filer > df -h testvol
Filesystem total used avail capacity Mounted on
/vol/testvol/ 9728MB 1796KB 9726MB 0% /vol/testvol/
/vol/testvol/.snapshot 512MB 0MB 512MB 0% /vol/testvol/.snapshot
geekyfacts-filer >

Snap Restore 

Export and mount the testvol to put some contents in the volume. 

geekyfacts-filer > exportfs -p rw=geekyfacts.com,root=geekyfacts.com /vol/testvol

Login to the server for which volume was exported(in our case geekyfacts.com)

[root@geekyfacts]# mkdir /test
[root@geekyfacts]# mount geekyfacts-filer:/vol/testvol /test
[root@geekyfacts]# df -h /test
Filesystem Size Used Avail Use% Mounted on
geekyfacts-filer:/vol/testvol
9.5G 1.8M 9.5G 1% /test

[root@geekyfacts]# cd /test
[root@geekyfacts]# touch file.before_snapshot

geekyfacts-filer > snap create testvol testsnap
creating snapshot...


geekyfacts-filer > snap list testvol
Volume testvol
working...

%/used %/total date name
---------- ---------- ------------ --------
0% ( 0%) 0% ( 0%) Dec 19 02:15 testsnap


[root@geekyfacts]# touch file.aftersnap

[root@geekyfacts]# ls -l
total 0
-rw-r--r-- 1 root root 0 Dec 19 02:16 file.aftersnap
-rw-r--r-- 1 root root 0 Dec 19 02:15 file.before_snapshot


Snapshot testsnap hold only file.before_snapshot 

[root@geekyfacts]# ls .snapshot/testsnap/
file.before_snapshot


Volume restore using Snapshot

geekyfacts-filer > snap restore -t vol -s testsnap testvol
WARNING! This will revert the volume to a previous snapshot.
All modifications to the volume after the snapshot will be
irrevocably lost.

Volume testvol will be made restricted briefly before coming back online.
Are you sure you want to do this? yes
You have selected volume testvol, snapshot testsnap
Proceed with revert? yes
Volume testvol: revert successful.


[root@geekyfacts]# ls
file.before_snapshot
File Restore using Snapshot

[root@geekyfacts]# rm file.before_snapshot
rm: remove regular empty file `file.before_snapshot'? y


geekyfacts-filer> snap restore -t file -s testsnap -r /vol/testvol/file.before_snapshot /vol/testvol/file.before_snapshot
WARNING! This will restore a file from a snapshot into the active
filesystem. If the file already exists in the active filesystem,
it will be overwritten with the contents from the snapshot.

Are you sure you want to do this? yes
You have selected file /vol/testvol/file.before_snapshot, snapshot testsnap
It will be restored as /vol/testvol/file.before_snapshot

Proceed with restore? yes

[root@geekyfacts]# ls
file.before_snapshot
geekyfacts-file >#


Snap Delta 


[root@geekyfacts]# touch file{1,2,3,4}

geekyfacts-file > snap create testvol testsnap1
creating snapshot...


geekyfacts-file > snap list testvol
Volume testvol
working...

%/used %/total date name
---------- ---------- ------------ --------
0% ( 0%) 0% ( 0%) Dec 19 02:23 testsnap1
19% (19%) 0% ( 0%) Dec 19 02:15 testsnap


geekyfacts-file > snap delta testvol
Volume testvol
working...

From Snapshot To KB changed Time Rate (KB/hour)
--------------- -------------------- ----------- ------------ ---------------
testsnap1 Active File System 56 20s 10080.000
testsnap testsnap1 424 0d 00:08 3173.388

Summary...
From Snapshot To KB changed Time Rate (KB/hour)
--------------- -------------------- ----------- ------------ ---------------
testsnap Active File System 480 0d 00:08 3449.101

geekyfacts-file>

Snap reclaimable 


geekyfacts-file > snap reclaimable testvol testsnapProcessing (Press Ctrl-C to exit) .
snap reclaimable: Approximately 424 Kbytes would be freed.

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