>> This what I'm building isn't shared SCSI.
>> I'm believe that shared SCSI couldn't survive some kind of crashes.
I just want to clarify that a shared scsi solution can be made no-SPOF and thus
is at least as reliable as a drbd based solution.
The real issue is cost, not reliability.
To do a no SPOF shared scsi solution, you have to build 2 separate shared scsi
buses each with a set of data drives, then mirror the data between the 2
different buses. Another key component is to use external bus terminators,
I have never setup this kind of solution under Linux, but it is one of the very
few no SPOF solutions officially supported in Compaq UNIX TruClusters.
Deployment and Integration Specialist
Compaq ASE - Tru64 v4, v5
Compaq Master ASE - SAN Architect
The Norcross Group