Hello,
Last night i had the idea of building a multipath iSCSI setup with
DRBD in Primary/Primary.
My idea was/is:
I have two machines with a 30GB partition wich is synced via DRBD (i
assume everybody here is familiar with DRBD).
My DRBD is running fine both machines are UpToDate and they are both
primary.
On top of /dev/drbd0 i made a LVM VG with the name "data", in this VG
i created 3 LV's with a size of 5GB.
For this e-mail i'll call the machines target1, target2 and iscsi-
initiator
target1: 192.168.5.199
target2: 192.168.5.200
iscsi-initiator: 192.168.5.198
On both the targets i have created the folling ietd.conf:
Target iqn.2007-04.nl.pcextreme:ha
Lun 0 Path=/dev/data/lun0,Type=fileio
Lun 1 Path=/dev/data/lun1,Type=fileio
Lun 2 Path=/dev/data/lun2,Type=fileio
So both targets have the same IQN and i tried to create a multipath
from the client to both tartgets:
iscsiadm -m discovery -t sendtargets -p 192.168.5.199
iscsiadm -m discovery -t sendtargets -p 192.168.5.200
iscsiadm -m node -T iqn.2007-04.nl.pcextreme:ha -p 192.168.5.199 --
login
iscsiadm -m node -T iqn.2007-04.nl.pcextreme:ha -p 192.168.5.200 --
login
This works and i get a total of 6 new SCSI devices, but multipath
won't recognize them as a redundant path:
r...@iscsi-client:~# multipath -ll
149455400000000000000000001000000595800000f000000dm-3 IET ,VIRTUAL-
DISK
[size=5.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][active]
\_ 5:0:0:0 sde 8:64 [active][ready]
149455400000000000000000001000000dd3c00000e000000dm-0 IET ,VIRTUAL-
DISK
[size=5.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][active]
\_ 4:0:0:1 sdc 8:32 [active][ready]
149455400000000000000000001000000925800000f000000dm-5 IET ,VIRTUAL-
DISK
[size=5.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][active]
\_ 5:0:0:2 sdg 8:96 [active][ready]
149455400000000000000000001000000655800000f000000dm-4 IET ,VIRTUAL-
DISK
[size=5.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][active]
\_ 5:0:0:1 sdf 8:80 [active][ready]
149455400000000000000000001000000a03c00000e000000dm-1 IET ,VIRTUAL-
DISK
[size=5.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][active]
\_ 4:0:0:0 sdb 8:16 [active][ready]
149455400000000000000000001000000193d00000e000000dm-2 IET ,VIRTUAL-
DISK
[size=5.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][active]
\_ 4:0:0:2 sdd 8:48 [active][ready]
r...@iscsi-client:~#
Is this a target issue because the "sessions" are not synchronized
between both targets? Or is this related to Open-iSCSI and multipath?
Is my setup a possibility or should i stay with the old regular setup
of a Primary/Standy with heartbeat?
Thank you in advance,
Wido den Hollander
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