Disk mirroring over a network

Hi all,

can anyone tell me if there is any simple way to implement disk
mirroring over a network with two machines each with linux insalled.

Besides, I would like to know also if there is any ways for the backup
machine to take over the master server in case the master fails.

Thanks in advance.

Ivan

Ivan wrote:

> Hi all,
>
> can anyone tell me if there is any simple way to implement disk
> mirroring over a network with two machines each with linux insalled.

Define "mirroring." If you want both drives to be written at the same time
with the same information, use RAID (needs to be in the same machine). If
you just want periodic backups, use rsync (works over a netork).


$ man rsync

> Besides, I would like to know also if there is any ways for the backup
> machine to take over the master server in case the master fails.

That is much more difficult. You are imagining a scenario in which the
master machine's HDD fails, but the machine still hums along without
difficulty, so it can use its network connection and rely on the backup
machine. Don't count on it.

--
Paul Lutus
http://www.arachnoid.com

Paul Lutus wrote:

> Ivan wrote:
>
>> Hi all,
>>
>> can anyone tell me if there is any simple way to implement disk
>> mirroring over a network with two machines each with linux insalled.
>
> Define "mirroring." If you want both drives to be written at the same time
> with the same information, use RAID (needs to be in the same machine).

Not necessarily. You might want to read up on SANs and iSCSI.

--

Fundamentalism is fundamentally wrong.

To reply to this message, replace everything to the left of "@" with
james.knott.

On Fri, 26 Sep 2003 10:53:27 +0000, James Knott wrote:

> Paul Lutus wrote:
>
>> Ivan wrote:
>>
>>> Hi all,
>>>
>>> can anyone tell me if there is any simple way to implement disk
>>> mirroring over a network with two machines each with linux insalled.
>>
>> Define "mirroring." If you want both drives to be written at the same time
>> with the same information, use RAID (needs to be in the same machine).
>
> Not necessarily. You might want to read up on SANs and iSCSI.

Check out http://www.linux-ha.org and drbd wich is a network mirroring
utility. I tried myself together with the heartbeat package to have a
failover in case off HW error. Though should you use it with care and
NOT in a sensetive business situation cause you can easily destroy data.

Regards
Fredrik Lindstrom ((E-Mail Removed))


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