How to create LVM snapshots?


 
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# 1  
How to create LVM snapshots?

Please suggest me how do I create LVM snapshots in linux.


Best regards,
Vishal
# 2  
Hello Vishal,

Could you please refer following link, it may help you in same.

https://access.redhat.com/documentat...t_command.html

Thanks,
R. Singh
# 3  
Thanks Ravinder!

I created snap data_snap but unable to see in df -h
Code:
[root@cindb1004a onecommand]# lvs
  LV        VG      Attr   LSize   Origin   Snap%  Move Log Copy%  Convert
  LVDbOra1  VGExaDb owi-ao 100.00G
  LVDbSwap1 VGExaDb -wi-ao  24.00G
  LVDbSys1  VGExaDb -wi-ao  30.00G
  LVDbSys2  VGExaDb -wi-a-  30.00G
  data_snap VGExaDb swi-a-   1.00G LVDbOra1   0.05

Then created filesystem but not working

Code:
[root@cindb1004a onecommand]# mke2fs -t ext4 /dev/VGExaDb/data_snap
mke2fs 1.39 (29-May-2006)
mke2fs: invalid blocks count - /dev/VGExaDb/data_snap

Please advise.


Best regards,
Vishal

Last edited by rbatte1; 02-02-2015 at 07:55 AM.. Reason: Added CODE tags
# 4  
Hello,

I am unable to mount fs

Code:
[root@cindb1004a VGExaDb]# mount -t ext3 /dev/VGExaDb/data_snap /snap_db
mount: wrong fs type, bad option, bad superblock on /dev/VGExaDb/data_snap,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so


Please assist.


Best regards,
Vishal

---------- Post updated at 05:16 PM ---------- Previous update was at 05:10 PM ----------

Please refer to below error:

Code:
[root@cindb1004a VGExaDb]# dmesg | tail
Buffer I/O error on device dm-4, logical block 1
Buffer I/O error on device dm-4, logical block 2
Buffer I/O error on device dm-4, logical block 3
Buffer I/O error on device dm-4, logical block 4
Buffer I/O error on device dm-4, logical block 5
Buffer I/O error on device dm-4, logical block 6
Buffer I/O error on device dm-4, logical block 7
EXT3-fs: unable to read superblock
EXT3-fs: unable to read superblock
EXT3-fs: unable to read superblock


Regards,
Vishal
# 5  
@admin_db, Snapshots are won't list in df -h. Instead list the Logical volumes
Code:
# sudo  lvs -o +devices

You have created your filesystem using
Code:
# mke2fs -t ext4 /dev/VGExaDb/data_snap

Then trying to mount with ext3 how it will mount ? Mount it using
Code:
# mount  /dev/VGExaDb/data_snap /snap_db

Hope this will mount.. Please provide us which operating system you using by running command
Code:
# lsb_release -a

If you need to know more about how to work with snapshot please feel free to read my article right here

How to Take 'Snapshot of Logical Volume and Restore' in LVM - Part III

Last edited by rbatte1; 02-03-2015 at 07:03 AM.. Reason: Added CODE tags
This User Gave Thanks to babinlonston For This Post:
# 6  
Hello,

This doesn't seem to be a supported command.

Code:
[root@cindb1002a ~]# lsb_release -a
-bash: lsb_release: command not found

Best regards,
Vishal

---------- Post updated at 03:49 PM ---------- Previous update was at 03:47 PM ----------

Code:
[root@cindb1002a ~]# cat /etc/enterprise-release
Enterprise Linux Enterprise Linux Server release 5.8 (Carthage)

Best regards,
Vishal

Last edited by admin_db; 02-05-2015 at 04:48 PM.. Reason: adding command
 

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