[sclug] Mirror disks across machines like distributed RAID?

Dickon Hood dickon-ml at fluff.org
Tue Jan 5 15:07:00 UTC 2010

On Mon, Jan 04, 2010 at 11:39:35 +0000, Tom Carbert-Allen wrote:
: On 02/01/2010 12:20, Dickon Hood wrote:
: >On Fri, Jan 01, 2010 at 23:48:24 +0000, John Stumbles wrote:
: >doesn't help if/when the host
: >: system goes bad,

: >iSCSI.  Export the block device from the server to the client, use it as
: >any other block device (so add it to LVM / md / whathaveyou) on the
: >client.  Job's a goodun.  And it's standard.

: Dickon,

: iSCSI is great, I use it for my diskless machines and VM's etc, but 
: doesn't meet the OP requirements, a client/server disk system which you 
: suggest does not provide the fail over of services he wanted.

Fair point.  I misread his email.

: BTW, drbd is now in the mainline kernel, so is "standard" too, I have 
: never understood why DRBD had so many haters in the past, any ideas?

drbd is a Linux-only thing (ATM at least); it is in no way 'standard'.
iSCSI has a series of well-regarded standards bodies behind it, and is.

I've no idea why it's taken so long to get into the mainline, or why so
many people seem to dislike it.  Other than the initial LKML thread on it,
where they criticised the code style and pointed out a few other issues,
I've not seen anything about it.  It did seem to me to be a bit of a
solution looking for a problem, but it's a neat enough technology and I'm
sure someone will find one.

Dickon Hood

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