Re: removing a single device?

From: Robert L. Harris (Robert.L.Harris@rdlg.net)
Date: Wed Jul 02 2003 - 14:39:03 EST

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Just had it hit me again.

# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: SEAGATE Model: ST318404LC Rev: 0006
  Type: Direct-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 01 Lun: 00
  Vendor: SEAGATE Model: ST318404LC Rev: 0006
  Type: Direct-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: SEAGATE Model: ST318404LC Rev: 0006
  Type: Direct-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 03 Lun: 00
  Vendor: SEAGATE Model: ST318404LC Rev: 0006
  Type: Direct-Access ANSI SCSI revision: 03
# echo "scsi remove-single-device 0 0 2 0" > /proc/scsi/scsi
# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: SEAGATE Model: ST318404LC Rev: 0006
  Type: Direct-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 01 Lun: 00
  Vendor: SEAGATE Model: ST318404LC Rev: 0006
  Type: Direct-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: SEAGATE Model: ST318404LC Rev: 0006
  Type: Direct-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 03 Lun: 00
  Vendor: SEAGATE Model: ST318404LC Rev: 0006
  Type: Direct-Access ANSI SCSI revision: 03

Kernel is 2.4.16. Unfortunately I didn't build the kernel so I don't
know what options it was compiled with. Is it possible the previous
admin left out a piece needed to enable this?

Thus spake Douglas Gilbert (dgilbert@interlog.com):

> Robert L. Harris wrote:
> > A long time ago I used to be able to do:
> >
> > echo "scsi add-single-device 0 0 11 0" > /proc/scsi/scsi
> > echo "scsi remove-single-device 0 0 11 0" > /proc/scsi/scsi
> >
> > When I wanted to unplug a SCA scsi drive for replacement. I tried this
> > recently on my 2.4.20 kernel and nothing happened. No errors, no change
> > to /proc/scsi/scsi, no entry in dmsg, it just ignored it. Has this been
> > deprecated for a new way of removing hotswap drives?
>
> Robert,
> It is not deprecated (and is still present in the lk 2.5
> development series since we still have no other way of
> doing this from the user space).
>
> The parsing of that expression is very rigid: no tabs
> or redundant spaces.
>
> Doug Gilbert

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