Re: [PATCH 0/3] Add disk hotswap support to libata

[Michael Tokarev <mjt@tls.msk.ru>]

Lukasz Kosewski wrote:
[]
> [1]  The SCSI error on 2.6.13-rc3-mm1 that I found:
> 'echo "scsi add-single-device a b c d" > /proc/scsi/scsi'  //works, or 
> no-op if the sd corresponding to that device is there already
> 'echo "scsi remove-single-device a b c d" > /proc/scsi/scsi'  //works
> 'echo "scsi add-single-device a b c d" > /proc/scsi/scsi'  //works
> 'echo "scsi remove-single-device a b c d" > /proc/scsi/scsi'  //FAILS

echo -n 1 > /sys/.../hostA/targetA:B:C/A:B:C:D/delete
still works.  I think.
And (again, I think) this same problem exists with 2.6.11 as well.
At least, I wasn't able to remove-single-device even once (I discovered
this mechanism only recently, haven't tried it with other kernels).

> As such, since the same underlying functions are called by hotplugging, 
> you will only be able to remove a disk from a device once before it 
> fails, until this error is fixed.  I'll look into it as well.

/mjt