LinuxQuestions.org
Share your knowledge at the LQ Wiki.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices


Reply
  Search this Thread
Old 09-25-2015, 04:23 PM   #1
sammie10
LQ Newbie
 
Registered: Sep 2015
Posts: 2

Rep: Reputation: Disabled
LVM snapshots of ext3 filesystem


I hope I'm posting in the right place, hello, I'm a forum and linux newbie. I am a storage engineer and know enough proprietary linuxese to get by on my various arrays and FC switches. I have tried to find the answer to this question myself through Google but my linux ignorance stumps me. My question: is it possible with RedHat 6.6, filesystem ext3, clustered servers, to set up copy-on-write snapshots (not a clone) of a filesystem. I have no control over the filesystem version, it is ext3.

Thank you for any information and guidance!!

sandy
 
Old 09-25-2015, 09:11 PM   #2
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 14,838

Rep: Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822
Probably not - read this page.
Good manual to download - as are the rest of those in the storage section (at least) - docs.redhat.com will get you started, just pick the right version.
 
Old 09-25-2015, 10:30 PM   #3
ericson007
Member
 
Registered: Sep 2004
Location: Japan
Distribution: CentOS 7.1
Posts: 656

Rep: Reputation: 121Reputation: 121
If the reason why you are asking is because of compliance reasons, then I think that in itself will be argument enough to switch file systems.

I am no master at these things, but if versioning for audits are required, I think best to try moving to ext3cow.

Maybe setup a test box and try converting some of that system. If it goes smooth, you may be able to convince higher ups

Last edited by ericson007; 09-25-2015 at 10:31 PM.
 
Old 09-25-2015, 11:49 PM   #4
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 14,838

Rep: Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822
Snaps of ext3 aren't the problem, clustering is the issue.
Using ext3 in a cluster in the first place might be a much bigger problem though.

Edit: I wouldn't be recommending a filesystem that hasn't had an update since 2008.

Last edited by syg00; 09-25-2015 at 11:50 PM.
 
1 members found this post helpful.
Old 09-26-2015, 09:57 AM   #5
sammie10
LQ Newbie
 
Registered: Sep 2015
Posts: 2

Original Poster
Rep: Reputation: Disabled
Thanks much ericson & syg! I will look at the docs. I am migrating this data (~100TB) from an existing ext3 RedHat 6.6 server. We're keeping file system to ensure a good migration. It will be a one shot deal, I won't have the opportunity to backup the initial migration or remigrate if a follow-on filesystem upgrade runs into issues. Taking cluster out of the picture, that is an option.
 
Old 09-26-2015, 08:00 PM   #6
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 14,838

Rep: Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822
I assume you know all this, but there are some considerations. Snaps are great for backup like that, but;
- snaps are "point in time". If that (source) filesytem is write active, you will lose any updates after the snap is taken.
- if it is (very) active, the snap will start consuming space - maybe (very) quickly. If the snap fills it will usually be automatically unmounted.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
LVM and snapshots sagar666 Linux - Server 8 05-14-2015 09:02 PM
Need to recover ext3 filesystem- MBR and LVM are gone :( IronHelix Linux - General 3 05-19-2008 04:14 AM
LVM snapshots: How to use? gargamel Linux - Server 12 02-24-2008 03:57 PM
LXer: Back Up (And Restore) LVM Partitions With LVM Snapshots LXer Syndicated Linux News 0 04-17-2007 12:16 PM
Increase EXT3 Filesystem size in a LVM? jadupl2 Red Hat 3 11-14-2004 09:40 PM


All times are GMT -5. The time now is 06:52 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration