[DRBD-user] Raid1/Drbd read performance

Walter Robert Ditzler ditwal001 at gmail.com
Sun Aug 25 16:06:25 CEST 2013

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



to me here your question confuses a bit. About what RAID you talk about?
RAID0, RAID1 or RAID5? With RAID0 you have twice read performance in best
case. But DRBD does RAID1 over TCP/IP what means mirroring two disk/disk
set. If one fails the other one comes into operation.


Next I don't understand, when you got iSCSI then you don't need DRBD! In my
mind iSCSI devices are all connected to the same host, here what you need is


DRBD usually you will need to implement RAID1 with two separate hosts, to
become hardware redundanty over TCP/IP. If that is what you need, then yes,
DRBD can do this.


Thanks, Walter


From: drbd-user-bounces at lists.linbit.com
[mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of ml ml
Sent: Sonntag, 25. August 2013 14:36
To: drbd-user at lists.linbit.com
Subject: [DRBD-user] Raid1/Drbd read performance


Hello list!

I am using xen with drbd which is attached to two iscsi targets.


On normal hardware raid controllers the read is done from two disks ( so u
get about twice the read performance).


Does Drbd support this? (reading from secondary over the network)




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