Hello!
Do you mind if I drop in your discussion?
What speeds are you seeing (reads and writes) on your Dom0? I'm
setting up something similar with IET and open-iscsi, and am trying to
tune it for performance.
I'd appreciate any numbers you would be willing to share. Also, what
is your hardware setup? Hardware RAID, software RAID, network setup?
Cheers
cc
On Fri, Mar 13, 2009 at 6:47 AM, PCextreme B.V. - Wido den Hollander
<wido@xxxxxxxxxxxx> wrote:
> Hi,
>
> Let me drop into this discussion.
>
> I have been running iSCSI on the dom0 for about 2 years now and that
> works fine.
>
> Making your iSCSI Target High Available can be done by using DRBD and
> Heartbeat, i have written a small howto (in Dutch), if you would to have
> this, contact me.
>
> Failovers on the iSCSI Target side go without notice of the domU, on the
> dom0 you get a iSCSI connection error, but that's it.
>
> This whole setup can be created with Open-iSCSI, iSCSI Enterprise
> Target, DRBD and Heartbeat.
>
> -
> Met vriendelijke groet,
>
> Wido den Hollander
> Hoofd Systeembeheer / CSO
> Telefoon Support Nederland: 0900 9633 (45 cpm)
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>
>
> On Fri, 2009-03-13 at 09:37 -0400, John Madden wrote:
>> > I think that we would have to reboot each domU in this case after a
>> > failure, isn't it? The goal is to have domUs which would not be affected
>> > by failure of one storage servers.
>>
>> Ideally, the initiator in dom0 would handle the failover of the target
>> successfully and domU would never know anything had happened. I've done
>> things like entirely restart the target daemon without initiators
>> caring, but if it's gone long enough while i/o is going on, bad things
>> will happen.
>>
>> > > Abstract your disks and iscsi exports; then use ZFS on two pools this
>> > > will
>> > > minimize the administration.
>> >
>> > ZFS seems to be very nice, but sadly we are not using Solaris and don't
>> > want to use it with FUSE under Linux. Nevertheless does anyone use ZFS
>> > under Linux and can share his/her experiences?
>>
>> I wouldn't pay too much attention to the ZFS fanboi's anyway. It's does
>> good things but hardly anything truly useful that you can't find in LVM
>> and doesn't really change anything in this case.
>>
>> John
>>
>>
>>
>
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--
Chris Chen <muffaleta@xxxxxxxxx>
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