Messages in this thread |  | | Subject | Re: Linux Cluster using shared scsi | Date | Thu, 03 May 2001 09:52:03 -0400 | From | James Bottomley <> |
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There is another nasty in multi-port arrays that I should perhaps point out: a bus reset isn't supposed to drop the reservation if it was taken on another port. A device or LUN reset will drop reservations on all ports. This behaviour, although clearly mandated by the SCSI-3-SPC, is rather patchily implemented in arrays and I have seen some multi-port arrays that will, illegally, drop reservations on all ports on receipt of a bus reset.
Unfortunately, most Linux SCSI drivers won't issue device resets on command, they'll only issue bus resets, so it is possible to get into a situation where you cannot break a reservation belonging to a dead machine, if you set up a point-to-point cluster rather than a true shared-scsi one.
James
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