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by Julez
2012/08/10 08:24:20
Forum: CentOS 6 - General Support
Topic: How to mirror a file system using minimal bandwith?
Replies: 10
Views: 1722

Re: How to mirror a file system using minimal bandwith?

Here's the list of things for which I thought a block level synchronisation would be better than rsync: > software & kernel upgrades, file permissions & attributes, config changes, user changes etc. File attributes can be removed from that list. Permissions can't be rsync'd if the user doesn't exist...
by Julez
2012/08/09 22:39:49
Forum: CentOS 6 - General Support
Topic: How to mirror a file system using minimal bandwith?
Replies: 10
Views: 1722

Re: How to mirror a file system using minimal bandwith?

Thanks, I've taken a closer look at DRBD. Just using the checksum-based re-synchronization feature on its own might tick all the boxes. It appears to be a block level rsync, which is exactly what I was looking for. http://www.drbd.org/users-guide-8.3/s-resync.html One of the main reasons for changin...
by Julez
2012/08/09 15:30:49
Forum: CentOS 6 - General Support
Topic: How to mirror a file system using minimal bandwith?
Replies: 10
Views: 1722

How to mirror a file system using minimal bandwith?

What's the best way to mirror a CentOS server to a remote server in a way that minimises the bandwith used? The scope/requirements of the solution are: - The synchronisation is occasional (e.g. nightly), not continuous. Any continuous synchronisation method (e.g. DRDB) would use too much bandwidth. ...
by Julez
2011/04/07 18:26:07
Forum: CentOS 5 - General Support
Topic: What size LVM volume to hold a 32GB file?
Replies: 6
Views: 832

Re: What size LVM volume to hold a 32GB file?

More about calculating ext3 overhead space
http://www.lisnichenko.com/articles/ext3-file-system-overhead-disclosed-part-2.html

All the articles I find about fine-tuning the space talk about reducing/removing journal & reserved space to free up space for data.
by Julez
2011/04/07 17:21:08
Forum: CentOS 5 - General Support
Topic: What size LVM volume to hold a 32GB file?
Replies: 6
Views: 832

What size LVM volume to hold a 32GB file?

Ah yes, the journal is a hidden file in the file system's root directory, so it shares the space of normal files. That explains why df shows 0 available space until the reserved space is reduced to 73134. [code] # tune2fs -r 73135 /dev/mapper/vm-ic030 tune2fs 1.39 (29-May-2006) Setting reserved bloc...
by Julez
2011/04/07 15:40:09
Forum: CentOS 5 - General Support
Topic: What size LVM volume to hold a 32GB file?
Replies: 6
Views: 832

Re: What size LVM volume to hold a 32GB file?

Thanks, that was the answer I was looking for. [quote]I guess the discrepancy is caused by journalling, directory structure information etc[/quote] The term I was looking for is 'reserved space', that makes it easier to Google :) [quote]Did you use tune2fs to change the default 5% space reserved for...
by Julez
2011/04/07 09:57:44
Forum: CentOS 5 - General Support
Topic: What size LVM volume to hold a 32GB file?
Replies: 6
Views: 832

What size LVM volume to hold a 32GB file?

How big should an LVM volume be to hold a single 32GB file? I thought 33GB would be enough, but apparently not. A volume has run out of space. There are 2 identical volumes holding identical sized files (kvm virtual hard drives in raw format). One (ic030) is showing zero free space and one is showin...
by Julez
2010/10/11 16:19:35
Forum: CentOS 5 - Software Support
Topic: Switch between full-screen VNC instances with one keypress?
Replies: 5
Views: 5167

Re: Switch between full-screen VNC instances with one keypress?

Another work-around I investigated was using the XDMCP protocol with Xnest as the client. Unfortunately it doesn't have a full-screen option (strangely and uniquely for a remoting client) but it can be made full-screen using Gnome as described above. Xephyr is an alternative XDMCP client that does h...
by Julez
2010/10/11 13:11:44
Forum: CentOS 5 - Software Support
Topic: Switch between full-screen VNC instances with one keypress?
Replies: 5
Views: 5167

Re: Switch between full-screen VNC instances with one keypress?

The other solution I found is to start another X desktop and put the vncviewer in it. Then it's possible to switch between them by pressing Ctrl+Alt+F7 and Ctrl+Alt+F8. I'd perfer to use workspaces if possible though.

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