Re: SCSI removable devices problem

[Giuliano Pochini <pochini@shiny.it>]

On Sun, 1 Aug 2004 09:24:21 -0700
"Randy.Dunlap" <rddunlap@osdl.org> wrote:

> On Sun, 1 Aug 2004 14:19:31 +0200 Giuliano Pochini wrote:
> 
> | 
> | 
> | It seems that 2.6.7 reads the partition table only once: when the scsi unit
> | is added to the list during boot or when I send the "add-single-device"
> | command. This is a problem with removable devices because if the drive
> | hasn't a disk inserted at boot time, attempting to mount a partitioned disk
> | always results in:
> | 
> | mount: /dev/sdb1 is not a valid block device
> | 
> | Also, bad things may happen (not tested) if a disk was in during boot and I
> | replace it with another one with a different partitioning.
> | 
> | As a workaround I have to send the "remove-single-device" command after
> | having unmounted a volume and "add-single-device" after I have inserted a
> | new one. I don't know when this problem was introduced, sorry.
> 
> I think that it's been this way for some time now...
> 
> Does using
> 	blockdev --rereadpt /dev/sdb1
> help?

Yes, that works.  But IIRC I didn't need that with linux 2.4. The kernel
should reread the table automatically when it receaves an UNIT_ATTENTION
message from the scsi bus.




--
Giuliano.