[clug] Dual-ported disks - or accessing disks from 2 systems
steve jenkin
sjenkin at canb.auug.org.au
Wed Aug 13 22:41:01 GMT 2008
I'd like to be able to access a disk from two different systems,
/cheaply/. Anyone done this or seen it done?
*Not* simultaneously update the same filesystem, but just to fail-over.
Last time I did this was SUN + fibrechannel + disk array + Veritas.
Out of the ballpark for this application :-)
I have a hack that should work, though the manufacturer doesn't
guarantee it. I've a Lantech Nexstar-3 with multiple-ports (USB,
firewire, ...) *all* are active at once. I've confirmed connecting
simultaneously won't damage the electronics. But the semantics of which
interface gets priority is unclear & this mode not officially supported.
What I'd *really* like is something based around SATA/e-SATA - do SATA
switches exist? Ie. connect two HBA's to one device.
Or if anyone can recommend a good/cheap iSCSI setup, that'd be interesting.
Can anyone tell me how much CPU overhead & network bandwidth iSCSI burns?
A good fallback position for me is a NSLU with USB attached disk.
But that introduces yet another point of failure...
cheers
steve
--
Steve Jenkin, Info Tech, Systems and Design Specialist.
0412 786 915 (+61 412 786 915)
PO Box 48, Kippax ACT 2615, AUSTRALIA
sjenkin at canb.auug.org.au http://members.tip.net.au/~sjenkin
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