Copying between file systems

Question

Our Oracle group has had some problems when copying data from a snap shot to a file system that uses the host resources and causes performance issues. I would like to be able to copy between file systems within the Celerra rather than export and mount them to a host. After the copy is done, we would just mount that newly refreshed file system to the host and keep resource utilization within the Celerra when copying data. What is the path to the mounted file systems within the Celerra and is copying like this an option?

Thanks

Rainer_EMC · Accepted Answer

for a complete file system or snapshot the easiest way to do this is through the Celerra Manager GUI

Assuming you have DART 5.6 and a Replicator license just select

Replications
New
Copy a File System

then in the "Choose a Checkpoint" box select which snapshot you want to be copied.
If you have a read-only file system of the same size you can specify that as the destination - otherwise the System will create one for you and names it _replica1

Note that the copy process creates a checkpoint on the destination fs - before you can delete it you need to delete the ckpt first

see attached screenshots

# ls -l FS_RAINER
total 8
drwxr-xr-x 2 root root 8192 Aug 5 10:40 lost+found
file system is empty

# ls -l FS_RAINER/.ckpt
total 8
drwxr-xr-x 5 root root 1024 Aug 5 10:42 2009_08_05_10.43.17_Europe_Berlin
# ls -l FS_RAINER/.ckpt/2009_08_05_10.43.17_Europe_Berlin/
total 16
drwxr-xr-x 2 root root 8192 Aug 5 10:40 lost+found
-rw-r--r-- 1 root root 56 Aug 5 10:42 RESTORE_ME.txt
but I've got a file to restore in a checkpoint

after the nas_copy from the GUI
# server_mount server_2 | grep RAI
FS_RAINER on /FS_RAINER uxfs,perm,rw
FS_RAINER_replica1 on /FS_RAINER_replica1 uxfs,perm,ro
I've got a new file system

# ls -l FS_RAINER_replica1/
total 16
drwxr-xr-x 2 root root 8192 Aug 5 10:40 lost+found
-rw-r--r-- 1 root root 56 Aug 5 10:42 RESTORE_ME.txt
which is a copy of the snapshot and can be exported

dynamox · Answer

we do this quite often, i take snapshot of production file system, fs_copy snapshot to development file system and then re-mount it there. Source and target file systems have to be identical size.

Eclipsys1 · Answer

I can't find the mount points for the snaps or even the file systems. What is the path to them?Thanks

dynamox · Answer

server_mount here is an example of mine: ckpt_fs107_Checkpoint_Daily_014 on /root_vdm_3/ckpt_fs107_Checkpoint_Daily_014 ckpt,perm,ro,accesspolicy=NATIVE

Eclipsys1 · Answer

This is most confusing. Can you just give me an absolute path?

Eclipsys1 · Answer

Your server_mount command just shows me the mount points but I need the absolute path to those mount points and when I do a search, they never come up.

dynamox · Answer

where and how do you search ?

Rainer_EMC · Answer

Hi,on the Celerra itself (data mover - not control station) you can copy a complete file system or a snapshot to a new file system using nas_copy/fs_copy or the GUIPlease do NOT use the control station for the copying with Linux commands - its not a strong NFS client and it is crucial for the system operation.If you want a single file copied you can try server_archiveI havent used it on a checkpoint but guess it would workregardsRainer

Rainer_EMC · Answer

same with CLIcreate an new file system of the same size:# nas_fs -name FS_RAINER_COPY -create samesize=FS_RAINER pool=clar_r5_performancemount it readonly# server_mount server_2 -o ro FS_RAINER_COPY /FS_RAINER_COPYserver_2 : done# server_mount server_2 | grep RAIFS_RAINER on /FS_RAINER uxfs,perm,rwFS_RAINER_COPY on /FS_RAINER_COPY uxfs,perm,rosee what checkpoints you've got on the source file system:# fs_ckpt FS_RAINER -lid ckpt_name creation_time inuse fullmark total_savvol_used ckpt_usage_on_savvol217 ckpt1 08/05/2009-10:43:18-CEST y 90% 9% 8%then use nas_copy to copy that checkpoint to the destination file system:# nas_copy -name test -source -ckpt ckpt1 -destination -fs FS_RAINER_COPY -interconnect loopbackOKnow its copied:# ls -l FS_RAINER_COPY/total 16drwxr-xr-x 2 root root 8192 Aug 5 10:40 lost+found-rw-r--r-- 1 root root 56 Aug 5 10:42 RESTORE_ME.txtand you can just export it and use it

Rainer_EMC · Answer

IF you just want to copy a single file or directory you can use the server_archive command

Its usage syntax is a bit awkward IMHO but it has the advantage that like NDMP or nas_copy it runs on
the data mover and doesnt use the control station CPU or CS-DM internal network

for example:

figure out where my checkpoint is mounted:
# server_mount server_2 |grep ckpt
ckpt_test_ckpt_001 on /root_vdm_1/ckpt_test_ckpt_001 ckpt,perm,ro
ckpt1 on /ckpt1 ckpt,perm,ro
ckpt1_replica1 on /ckpt1_replica1 ckpt,perm,ro

then copy it back to the file system:
# server_archive server_2 -rw -i /ckpt1/RESTORE_ME.txt /FS_RAINER
ATTENTION: server_archive interactive file rename operation.
-rw-r--r-- Aug 5 10:42 RESTORE_ME.txt
Input new name, or a "." to keep the old name, or a "return" to skip this file.
Input > >>RESTORE_ME_COPY.txt
Processing continues, name changed to: RESTORE_ME_COPY.txt

# ls -l FS_RAINER
total 16
drwxr-xr-x 2 root root 8192 Aug 5 10:40 lost+found
-rw-r--r-- 1 root root 56 Aug 5 10:42 RESTORE_ME_COPY.txt

Without the -i server_archive will copy the file or the whole directory using the same names
Unfortunately there doesnt seem an easy way to specify a new destination file name when working
non-interactively (see -s option if you are familiar with ed Syntax)

you could also traverse the checkpoints using the names that are displayed in the .ckpt dir like this:
# server_archive server_2 -rw -i /FS_RAINER/.ckpt/2009_08_05_10.43.17_Europe_Berlin/RESTORE_ME.txt /FS_RAINER

ATTENTION: server_archive interactive file rename operation.
-rw-r--r-- Aug 5 10:42 RESTORE_ME.txt
Input new name, or a "." to keep the old name, or a "return" to skip this file.
Input > >>RESTORE_ME_NEW2.txt
Processing continues, name changed to: RESTORE_ME_NEW2.txt

Celerra

Copying between file systems

Was this post helpful?