[CentOS] OOT: Advice on failover rsync setup

Tue Jan 23 23:25:49 UTC 2007
John Summerfield <debian at herakles.homelinux.org>

Mark Schoonover wrote:
> Benjamin Smith wrote:
>> On Wednesday 17 January 2007 04:41, Karanbir Singh wrote:
>>> Fajar Priyanto wrote:
>>>> I have a task on setting up a cluster of 2 servers for providing
>>>> ftp service. We use RH's Cluster suite. However the cluster setup
>>>> is lack of shared network storage, so the /var/ftp/pub is mounted
>>>> on each server. The cluster is set 
>>>> So, are we on the right direction? Or is there any better way?
>>>> Thank you very much,
>>> have you considered using drbd ?
>> Well, I was going to suggest using RAID1 with one of the partitions
>> being a network block device, but this looks even better!
>> Rsync is great for period backups (not more than once per day or so)
> I run rsync every hour on multi-terrabyte systems with no problems. The
> NASes do have a private GB network to push the data through, so the user
> network doesn't see the network traffic generated by rsync. I can have
> anywhere from just a couple hundred megs, to 100 gigs of data change inside
> of an hour.

OTOH I found running rsync daily over the Internet to backup a Linux box 
impractical; it used heaps of RAM (and swap) and ran for hours. 
Fortunately, its excessive use of swap (several times real RAM) didn't 
lead to thrashing.

Now, I run a hand-crafted script that makes a compressed ISO (mkzftree) 
and I rsync that. I'm maintaining a backup filesystem of about 8 Mbytes 
remotely now; the rsync runs for a little over two hours daily.



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