Qwerty-1 umakantgoyal1 at gmail.com
Wed Feb 3 05:51:26 CET 2010

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hi Mark,

Thanks, what i understood that, to replicate the data locally we need RAID
(RAID helps to decide which data need to be replicated). But if we want to
replicate the date over network then we need DRBD with RAID. In later case,
DRBD will help to transfer data over network (other machine) by making TCP
connectiong and RAID will help to decide which data needs to be replicated.
Please correct me if i am wrong.


Mark Watts wrote:
> On Mon, 2010-02-01 at 20:52 -0800, Qwerty-1 wrote:
>> Hi All,
>> Can someone expalin me what is difference between RAID and DRBD.
>> Thanks in Advance
> Short;
> RAID is designed for two or more disks connected locally.
> DRBD is designed to replicate a block-device over a network.
> Long:
> You'd use RAID (software or hardware) to increase the reliability of
> your _local_ storage over 2 or more disks.
> DRBD would sit on top of your RAID and replicate that data to another
> server for fail-over purposes.
> DRBD can also allow two servers to access that data at the same time,
> which you can't really do with RAID (ignoring the RAID that my underlie
> a SAN/iSCSI etc), assuming you're using a cluster-aware filesystem
> (GFS/OCFS2 etc).
> Mark.
> -- 
> Mark Watts BSc RHCE MBCS
> Senior Systems Engineer, Managed Services Manpower
> www.QinetiQ.com
> QinetiQ - Delivering customer-focused solutions
> GPG Key: http://www.linux-corner.info/mwatts.gpg
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