Re: [CentOS] Multi-Card reader (SD, MMC, etc) and CONFIG_SCSI_MULTI_LUN kernel option in 34.0.2. Workaround

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Quoting "J.J. Garcia" <stigmatedbrain@xxxxxxxxx>:

Hi folks,

Im trying to get a multi-card reader on centos (SD, MMC, and so, 4 card
slots) and i have read (http://www.cs.sfu.ca/~ggbaker/personal/cf-linux)
that CONFIG_SCSI_MULTI_LUN should be enabled on kernel (=Y) but current
34.0.2 doesn't have it enabled by default, is there any particular
reason to not be enabled?

Because some broken SCSI devices choke on that, and you don't really need it.

By the other hand i've also tweak the /etc/grub.conf file to boot the
kernel with max_luns=32 and results are the same, only scsc lun=0 is
recognized.

Not sure, but on command line you might need to specify for what module the option is (also, it is loadable module, not part of static kernel). Try passing "scsi_mod.max_luns=32" to the kernel.

Have you tried putting it into /etc/modprobe.conf (options scsi_mod max_luns=32) and rebuilding initrd image after that? That's the way I was doing it so far, and it always worked for me.

Also, since it is really USB device, could it be it doesn't have LUNs at all?

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