How to check the actual space usage by checkpoint

In celerra Manager -----> go to pools -----> select the checkpoint you want to check the space for -----> go to properties tab of the selected checkpoint -----> it shows the file system the checkpoint is configured for with the size occupied by it.

This shows the actual size of the checkpoint.

checkpoints of the same filesystem always share the same "storage" used (called a Savvol).

To find the size of the Savvol, you can run a "nas_fs -size

You'll see something like this:

[nasadmin@cs-scordc nasadmin]$ nas_fs -size ckpt_rh_fs_ckpt_sched_013
volume: total = 20000 avail = 16386 used = 3614 ( 19% ) (sizes in MB)
ckptfs: total = 241876 avail = 108939 used = 132937 ( 54% ) (sizes in MB) ( blockcount = 40960000 )


Volume = size of volume used by checkpoints, and % used of checkpoint, in this case 20GB disk space and 19% used.
Ckptfs = size of original volume.

As you can see below, I have multiple checkpoints of the same filesystem (rh_fs), but all share the same savvol volume...
[nasadmin@cs-scordc nasadmin]$ fs_ckpt rh_fs -l
268 ckpt_rh_fs_ckpt_sched_008 05/17/2007-00:45:04-EST y 90% 19%
269 ckpt_rh_fs_ckpt_sched_009 05/18/2007-00:45:04-EST y 90% 19%
270 ckpt_rh_fs_ckpt_sched_010 05/19/2007-00:45:04-EST y 90% 19%


Hope this helps

kevin, can you tell me how to increase the SAVVOL ?? i have problem somtime..,my check point refresh will fail with no free disk space

are you using system defined storage pools ?. i believe that snapsure will use unused space in the storage pool until its all used up. presenting more appropriate storage will extend system defined pools and give snapsure more room to operate.

you can manually extend a savvol with the nas_fs command like this:

nas_fs ¿x fs_test_ckpt1 size=50G

However you shouldnt need to. By default a savvol will automatically extend unless:
- you specifically turned that auto-extension off by setting %full to 0 when creating the checkpoint
- there is no more space in the pool that the file system is built from
- all savvols in total hit the 20% of total storage mark (configurable)

see the Using SnapSure on Celerra manual on Powerlink

It is my understanding that when you create a checkpoint it sets aside the space you specify. So if you have a 400 Gig File System and you set the size=20%, you will reserve 80 Gig for Snapshots.

It is also my understanding, if you run a rotating snap by setting the "Keep" to say 5 to get a snap Monday-Friday. It will put that change data for those 5 snaps in the same storage space (80 gig in this example).

So when you run the command...
nas_fs -size pfs06-Monday-ckpt (This would be the first of 5)
and it says you have used 5% of the storage....

Do you multiply that 5% x 5 to get how much is actually used?
So to get total snapshot space used, over 5 snaps it would actually be 25% of the disk space?