03-23-2006
Just because a process takes longer does not make it better. You can always find a longer way to accomplish a task. The size of your memory and really, the size of your buffer cache must be the problem. But you should use the raw device anyway.
That c201d4s0 does not look right to me either. But there are problems with the other devices names too. Something like /dev/rdsk/c0t6d0 is supposed to mean:
c0 (controller 0) the first scsi card configured in the system. It will have a chain of scsi devices and each device will have a scsi id. By convention, the controller itself will have an id of 7.
t6 (target 6) this is a device in the scsi chain. It will have a scsi id of 6. You seem to be saying that scsi id 4 got t6. That is a little odd.
d0 (disk 0) With ordinary disk mechs, d0 is all there ever is. But imagine 2 or 3 disks all sharing one scsi address. This is how you would tell them apart. This does get used in disk arrays.
All of this is a naming convention. You can call the disk /home/fred/stupid and it would still work. But don't do that.
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LEARN ABOUT DEBIAN
tk_scsiformat
tk_scsiformat(8) Scsiinfo User's Guide tk_scsiformat(8)
NAME
tk_scsiformat - low level format an scsi disk device with a nice user interface
SYNOPSIS
tk_scsiformat [device]
DESCRIPTION
Low level formats the SCSI device identified by the scsi disk or generic scsi device node device. You must be root to perform this opera-
tion. When you do not specify a device, tk_scsiformat gives you a list to select a disk device from.
tk_scsiformat is a Tcl/Tk user interface to scsiformat(8).
You should read that manual page for the general operation of scsiformat. All common X11 and Tcl/Tk options apply.
By the nature of graphical user interfaces, there should not be much to explain here. All entry fields refer directly to scsiformat(8)
options.
In addition to those, you are able to save your selections to be used as defaults for this device next time in a file /usr/lib/scsi/scsi-
format.defs.* by pressing the <Save Defaults> button. This is intended and very handy for formatting of removable medias. Note, however,
that tk_scsiformat is not as clever as scsiformat(8) (or even tries to be) to find if multiple ways to refer to the same scsi device (disk
device, generic device).
Furthermore, you can select (or enter freely) a command to automatically make a file system on the newly formatted disk.
While formatting a nice completion bar is drawn. Alas, I could not really implement querying progress from a target device yet.
The /usr/lib/scsi/tworands binary is used to calculate two random integers which is not supported by plain Tcl/Tk.
BUGS
When not specifying a device to format, tk_scsiformat will prepare a list of disk devices to choose from. Alas, if a blocking format opera-
tion is running on one of them, tk_scsiformat will block in a non interruptible disk wait sleep.
Old status files in /tmp will confuse tk_scsiformat. However, they are removed after 48 hours.
Restrictions of the SCSI_IOCTL_SEND_COMMAND ioctl(2) call for the sd(4) device make it impossible to issue a FORMAT_UNIT command with more
than 4096 bytes of arguments. This could be avoided by using the proper generic scsi device /dev/sg* instead, at least where the kernel is
compiled to support it. Most of the time this is not needed though and thus I'm myself to lazy to do it.
FILES
/usr/lib/scsi/tworands
/usr/lib/scsi/scsiformat.defs.*
/tmp/scsiformat.xx:xx:xx:xx:xxxxxxxx
/dev/sd*
/dev/sg*
SEE ALSO
scsiformat(8), scsiinfo(8), scsi-config(8), fdisk(8), sd(4).
AUTHOR
Michael Weller <eowmob@exp-math.uni-essen.de>
scsiinfo 1.7 23 August 1997 tk_scsiformat(8)