Dear Mr. H
AGAIN: THANKS FOR YOUR PRODUCT!
I am building a Beowulf Cluster for Meteorological Simulations (DK government)
and must boot the buggers over and over again.
At present boot and configure nodes in 3:40 min.
Fault tolerans and speed
1. I can now promote a node to master (BOOTP/TFTP/NFS/Repository...).
2. I can now push Repository to secret partition nodes and boot from the secret
partition.
I checked the KEXEC stuff and wondered that must be something you have been
following.
How would the call look like (i know its stupid but I really would like to
understand this stuff nad how your SW could work:
kexec -debug PXELINUX.0 SYSLINUX.CNF
Hvis a nice day
Henrik
-----Oprindelig meddelelse-----
Fra: H. Peter Anvin [ mailto:hpa at zytor.com]
Sendt: 23. oktober 2002 19:57
Til: Josef Siemes
Cc: Henrik Lassen; syslinux at zytor.com
Emne: Re: [syslinux] Boot from Linux
Josef Siemes wrote:> Hi,
>
> "Henrik Lassen" <HEL at fomfrv.dk> schrieb am 23.10.02
13:17:18:
>
>> Do you know how to boot from Linux???
>>
>>I reboot all the time and would like to skip the shutdown time (without
cutting the power).
>
>
> you want to load&execute a new linux kernel from a running kernel? As
far as I know this
> isn't possible. Or what do you mean?
>
There are a few systems which can do it, including the kexec patch that
was recently posted on the linux-kernel mailing list.
However, please note that you may find yourself having trouble because
the kernel you ran three weeks ago screwed up your hardware setting and
the current kernel can't deal with it.
-hpa
Henrik Lassen wrote:> Dear Mr. H > > AGAIN: THANKS FOR YOUR PRODUCT! > > I am building a Beowulf Cluster for Meteorological Simulations (DK government) and must boot the buggers over and over again. > > At present boot and configure nodes in 3:40 min. > > Fault tolerans and speed > > 1. I can now promote a node to master (BOOTP/TFTP/NFS/Repository...). > 2. I can now push Repository to secret partition nodes and boot from the secret partition. > > I checked the KEXEC stuff and wondered that must be something you have been following. > > How would the call look like (i know its stupid but I really would like to understand this stuff nad how your SW could work: > > kexec -debug PXELINUX.0 SYSLINUX.CNF >kexec runs a Linux kernel directly. It doesn't use PXELINUX or syslinux or anything like that, which are for from-scratch boots. I'm a bit nervous about people using kexec when they really should be rebooting, because of the "bug in the kernel three generations ago" problem, however, there are uses where I think that can be useful. -hpa