Re: High-availability question
Willy Tarreau (willy@novworld.Novecom.Fr)
Fri, 23 Jul 1999 07:50:54 +0200 (CEST)
> Try this with most SCSI card/driver combinations and you will have trouble.
> The bus reset performed by the second SCSI card to start up will screw up the
> operation of the first SCSI card. IF you use some sequencing trick to get
> things to start up you still cannot reboot one backup machine without
> screwing up the operation of the other.
>
> With some SCSI cards a specially adapted driver could get around this
> problem, but with other cards the hardware prevents this from ever working
> reliably.
>
> Steve
probably, but I remember having done this a long time ago : I shared 2 scsi
disks (80 MB each) between DOS and Linux on 2 separated hosts, and it worked
quite well. I believe my scsi cards were aha1520 and aha1542, but I'm not
really sure now since it was about 2 years ago.
but I must admit this was only for test purposes, and under low load, so
perhaps the bus reset never came during an I/O operation.
Willy
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