Messages in this thread | | | Date | Wed, 25 Apr 2001 12:17:08 -0400 | From | Doug Ledford <> | Subject | Re: SCSI-Multipath driver for 2.4? |
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Christoph Biardzki wrote: > > Hi, > > I wondered whether thera are already effrots to por the Multipath-driver > for FibreChannel (http://t3.linuxcare.org) to the 2.4 kernel? This patch > allows a transparent failover to another path to FC-attached > disk in case the primary path fails.
When we reviewed the code, we didn't like it all that much. It served it's purpose on the t3 stuff from Sun, but it wasn't generic enough to suit our tastes. So, Ingo wrote a multipath RAID extension as part of the MD driver and that's in our 7.1 product and will be sent to the mainstream kernel as soon as it's gotten enough testing to be deemed finished (for instance, there are horribly stupid devices out there that support what is called "Active-Passive" multipath, where if you write to the passive path, it makes the active path error out, which makes the device 100% useless for multi-initiator, shared SCSI/FC environments, and makes the device total junk in my opinion, but if we are going to support them in a Multipath setup, then the multipath driver has to be modified so it doesn't attempt to touch passive paths until the active path has already failed, which it doesn't currently attempt to do when writing superblocks or reading partition tables).
> Is there any documentation about the changes in the SCSI-driver interfaces > from 2.2 -> 2.4 (eg. in sd.c) ?
--
Doug Ledford <dledford@redhat.com> http://people.redhat.com/dledford Please check my web site for aic7xxx updates/answers before e-mailing me about problems - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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