celerra checkpoint question

Question

We have a nfs filesystem that we take periodic checkpoints on (both manual and scheduled). For example, we have a checkpoint dated 4/01 and one dated 4/10.

What happens to the 4/10 checkpoint if we perform a Full Checkpoint Restore to the original filesystem using the 4/01 checkpoint?

Does this make the 4/10 checkpoint irrelevant after this Checkpoint Restore?

Thanks.

Jim

Rainer_EMC · Accepted Answer

Hi Jim,

no - we still keep all of the checkpoints around (unlike some other NAS vendors).

In fact the first thing that happens when you execute a restore is than an extra checkpoint get created so that you can undo the restore

Rainer

[nasadmin@nstest ~]$ fs_ckpt rainer -l
id    ckpt_name                creation_time           inuse fullmark   total_sa                             vvol_used ckpt_usage_on_savvol
73    Monday                   04/19/2010-17:45:58-CEST y   90%        16%                                             3%
74    Tuesday                  04/19/2010-17:46:42-CEST y   90%        16%                                             3%
75    Wednesday                04/19/2010-17:46:45-CEST y   90%        16%                                             3%
76    Thursday                 04/19/2010-17:46:47-CEST y   90%        16%                                             3%
77    Friday                   04/19/2010-17:46:49-CEST y   90%        16%                                             3%

[nasadmin@nstest ~]$ /nas/sbin/rootfs_ckpt Wednesday -Restore
operation in progress (not interruptible)...id        = 75
name      = Wednesday
acl       = 0
in_use    = True
type      = ckpt
worm      = off
volume    = vp175
pool      = clar_r5_economy
member_of =
rw_servers=
ro_servers= server_2
rw_vdms   =
ro_vdms   =
checkpt_of= rainer Mon Apr 19 17:46:45 CEST 2010
deduplication   = Off
used      = 19%
full(mark)= 75%
stor_devs = CK200073500350-0009
disks     = d9
disk=d9    stor_dev=CK200073500350-0009 addr=c0t1l0         server=server_2
disk=d9    stor_dev=CK200073500350-0009 addr=c16t1l0        server=server_2

[nasadmin@nstest ~]$ fs_ckpt rainer -l
id    ckpt_name                creation_time           inuse fullmark   total_savvol_used ckpt_usage_on_savvol
73    Monday                   04/19/2010-17:45:58-CEST y   75%        19%                3%
74    Tuesday                  04/19/2010-17:46:42-CEST y   75%        19%                3%
75    Wednesday                04/19/2010-17:46:45-CEST y   75%        19%                3%
76    Thursday                 04/19/2010-17:46:47-CEST y   75%        19%                3%
77    Friday                   04/19/2010-17:46:49-CEST y   75%        19%                3%
78    rainer_ckpt1             04/19/2010-17:48:57-CEST y   75%        19%                3%

jimkunysz · Answer

great info here. thanks, but I'd like to clarify 1 item - so, if I perform a restore from checkpoint created 4/01 can I perfom a restore from a checkpoint created after 4/01 but before the Restore?

If I look in the snapsure guide, it says:

"If you create a checkpoint of any file system and write a file (for example, file1)

into the file system, and later restore the file system by using the checkpoint,

then the file (file1) does not remain. This is because the file did not exist when

the checkpoint was created."

This makes sense but what happens to checkpoints if they are inbetween the date of the checkpoint taken and the restore of the said checkpoint?

Jim

Peter_EMC · Answer

Think of a checkpoint as a 'point in time' copy or view of the FS. So when you restore a whole checkpoint, all checkpoints will be unaffected and available. You will not loose any checkpoint or its data. This is different than some other vendors are doing checkpoint restores.

jimkunysz · Answer

Thanks Rainer and Peter. You have been most helpful. Jim

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