Very Computer

by **Robert M. Riches J** » Thu, 25 May 2000 04:00:00

I'm trying to use cdrecord on a basically stock Redhat 6.1 Alpha
system. Following (or trying to follow) the How-To instructions,
I edited /etc/cdrecord.conf until it appears to be right. Then,
I ran mkisofs. Then I tried

cdrecord -dummy /tmp/dobackup.iso

Here's what it gives (indentation mine):

Cdrecord release 1.8a29 Copyright (C) 1995-1999 Jorg Schilling
cdrecord: Invalid argument. shmget failed

(Well, there are two dots above the 'o' in the first name.)

I can successfully use the -scanbus and -inq switches. However,
the -prcap switch gives essentially the message shown above.

Does the above message give any clue as to what I'm doing wrong?

Thanks.

Robert Riches

by **Tony Hammit** » Thu, 25 May 2000 04:00:00

Two ways to fix this:

Knock the fifo size down to 3 MB:

cdrecord -v fs=3m /tmp/dobackup.iso

or increase the shared memory maximum:

echo 5000000 > /proc/sys/kernel/shmmax

which only works on >= 2.2 version kernels

Using the 3MB fifo size is easier...

Regards,

Tony Hammitt

> I'm trying to use cdrecord on a basically stock Redhat 6.1 Alpha
> system. Following (or trying to follow) the How-To instructions,
> I edited /etc/cdrecord.conf until it appears to be right. Then,
> I ran mkisofs. Then I tried

> cdrecord -dummy /tmp/dobackup.iso

> Here's what it gives (indentation mine):

> Cdrecord release 1.8a29 Copyright (C) 1995-1999 Jorg Schilling
> cdrecord: Invalid argument. shmget failed

> (Well, there are two dots above the 'o' in the first name.)

> I can successfully use the -scanbus and -inq switches. However,
> the -prcap switch gives essentially the message shown above.

> Does the above message give any clue as to what I'm doing wrong?

> Thanks.

> Robert Riches

by **h0l0gRa** » Thu, 25 May 2000 04:00:00

> Two ways to fix this:

> Knock the fifo size down to 3 MB:

> cdrecord -v fs=3m /tmp/dobackup.iso

> or increase the shared memory maximum:

> echo 5000000 > /proc/sys/kernel/shmmax

> which only works on >= 2.2 version kernels

> Using the 3MB fifo size is easier...

> Regards,

> Tony Hammitt

Or you can edit linux/include/asm-alpha/shmparam.h
change #define SHMMAX 0xverysamall
to
#define SHMMAX 0x1000000

then recompile kernel

--
Bahdges? We don't need no stinkin' bahdges!
-- "The Treasure of Sierra Madre"

Very Computer

cdrecord says shmget failed

cdrecord says shmget failed

cdrecord says shmget failed

cdrecord says shmget failed