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SubjectSparse LUN scanning - 2.4.x
Date
Hi there,

We have an Apple Xserve RAID, connected through a FC switch. The RAID
has LUN-masking enabled, such that one of our Linux boxes only gets LUN
1 and not LUN 0. We're running the 2.4.x kernel series now, since this
is under a RHEL envinronment.

The problem is this: since LUN 0 does not show up -- specifically, it
can't read the vendor or model informaton -- the kernel SCSI scan does
not match with the table to tell the kernel to do sparse LUN
scanning... so the RAID does not appear.

I can make the RAID show up by injecting a add-single-device to the
SCSI proc layer. Trivially patching scsi_scan.c to always do sparse
scanning works as well. No hokery with max_scsi_luns or ghost devices
works.

I'm considering making a patch to add a kernel option to force sparse
scanning. Is there a better way?

Thanks in advance,

--Jim

--
Jim Zajkowski OpenPGP 0x21135C3 http://www.jimz.net/pgp.asc
System Administrator 8A9E 1DDF 944D 83C3 AEAB 8F74 8697 A823 2113 5C53
UM Life Sciences Institute




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