RES: [DRBD-user] DRBD + GFS + iSCSI?

CA Lists lists at
Tue Oct 17 03:54:09 CEST 2006

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

My concern was that having multiple clients writing data to the same disk
might be an issue for DRBD, but, based on your response, I'm assuming that
as long as the filesystem support write ordering, DRBD doesn't really care.
Is that an accurate assumption? Anyone else on the list done this before?


> Yes it is possible, and there is people that had done something like that
> before.
> You will do all that is done in the server part here:
> forget about the windows client part in the document.
> After you have one iscsi target under heartbeat exporting the drbd disk, you
> will have to install the iscsi initiator in the clients that will access the
> disk, and after that, install GFS in all the clients, pluss formatting the
> iscsi exported disk with gfs.
> You will use only drbd active/passive, there is no need to use active/active
> in this situation.
> You can use ocfs2 or any shared filesystem instead of gfs if you prefer.
> Please, documentate this configuration and send to me if possible.
> I had done this before, but didnt have time to documentate it yet.
> Best Regards.
> Leonardo Rodrigues de Mello
> -----Mensagem original-----
> De: drbd-user-bounces at em nome de CA Lists
> Enviada: dom 15/10/2006 13:39
> Para: drbd-user at
> Cc: 
> Assunto: [DRBD-user] DRBD + GFS + iSCSI?
> I'm wanting to create a cheap, yet redundant, iSCSI SAN solution. My thought
> was to get two separate servers, configure both with Linux-HA for failover,
> iSCSI Enterprise Target on a GFS (or OCFS2) disk, then mirror the disk from
> server1 to server2 via DRBD. I will need multiple clients (apache cluster &
> mysql cluster) to connect to whatever server is active at the time. I know
> that the current stable version of DRBD only supports 1 active system at a
> time, which is all I'm going for, but I wasn't sure if it would allow the
> disk to be exported via iSCSI and mounted on multiple clients at the same
> time, or if it considered that the same as trying to mount it on both
> servers at the same time.
> In the end, my goal is to have an iSCSI target machine, with a second one
> sitting there waiting (mirrored), just in case something goes wrong...
> Is this possible? Thanks,
> Rob
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