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Full Discussion: dd command
Operating Systems Solaris dd command Post 100046 by Perderabo on Thursday 23rd of February 2006 08:23:19 AM
Old 02-23-2006
PHP Epilog
OK, so I have a window with glance running to watch the internal operations of my dd command. The top few lines of glance are activity bars showing overall system utilization. For hours, disk usage was at 100%. Then I noticed that it dropped to 0. No disk utilization at all. Did my dd finish? Nope. It is still running. Both of my file pointers froze at exactly 34359738368. I allowed this situation to persist for a hour or so, mostly because I was busy with something else. Then I killed the dd command. I am certain it would have "ran" for another 4 days if I have let it. Or another 4 years. glance said that dd was in I/O wait and that (to me) points the finger towards the driver. If a gigabyte is 2^30, then 34359738368 is exactly 32 GB. That is a larger number than will fit into 32 bits. So the kernel, the driver, and dd are all in 64 bit mode. But apparently, the driver bumped into some other limit. Smilie
 

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LEARN ABOUT PLAN9

home

HOME(8) 						      System Manager's Manual							   HOME(8)

NAME

       home, 40meg, 80meg, personalize, update, Disclabel - administration for local file systems

SYNOPSIS

       gnot/home
       gnot/personalize
       gnot/update

       magnum/home
       magnum/personalize
       magnum/update

       pc/40meg
       pc/80meg
       pc/personalize
       pc/update

       nextstation/home
       nextstation/update

DESCRIPTION

       These programs help maintain a file system on a local disk for a private machine.

       Home  partitions a disk, copies the appropriate kernel to the disk, and makes a new file system on the disk.  To do this, it overwrites the
       vendor-supplied software on the disk with a copy of Plan 9.  40meg, 80meg, and 100meg configure disks and make file systems  for  disks	of
       the appropriate size.

       Update copies the current kernel to the disk and updates files on the local file system.  It only updates those files put there by the home
       program.

       Personalize removes the contents of the /usr directory on the local disk and copies a minimal set of files for the user who runs  the  com-
       mand.

       The  file  /rc/bin/nextstation/Disclabel,  despite  its	name,  is not an rc(1) script.	It contains the second stage bootstrap program for
       Nextstations booting from local disk.  Before  booting  a  Plan	9  Nextstation	from  disk,  it  should  be  installed	in  the  partition
       /dev/hd1label; this is normally done by nexstation/home.

FILES

       /lib/proto/portproto
	      Mkfs prototype files for magnum/home, magnum/update, gnot/home, and gnot/update.

       /lib/proto/386proto
	      Mkfs prototype files for pc/40meg, pc/80meg, and pc/update.

SOURCE

       /rc/bin/gnot/*
       /rc/bin/magnum/*
       /rc/bin/pc/*
       /rc/bin/nextstation/*

SEE ALSO

       kfs(4), mkfs(8), prep(8), wren(3)
       ``Installing the Plan 9 Distribution''.

																	   HOME(8)
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