Messages in this thread | | | From | Jesse Pollard <> | Subject | Re: Switching Kernels without Rebooting? | Date | Wed, 11 Jul 2001 19:31:22 -0500 |
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On Wed, 11 Jul 2001, Kip Macy wrote: >In the future when Linux is more heavily used at the enterprise level >there will likely be upgrade/revert modules to allow such a transition to >take place.
I use some of the largest UNIX supercomputers ever built (IBM SP, Cray T3E, SV1, YMP, XMP, J90, SGI Origin). None of them can start of a new kernel from an earlier version. There are too many things that will fail:
Any network activity Active disk I/O Locked memory File modification File structures Disk structures (yes they change...) Clock Synchronization (SMP and cluster) Shared memory (SMP and cluster) semaphores (SMP and cluster) login sessions device status shared disks and distributed file systems (cluster) pipes
Before you even try switching kernels, first implement a process checkpoint/restart. The process must be resumed after a boot using the same kernel, with all I/O resumed. Now get it accepted into the kernel.
Anything else is just another name for "reboot using new kernel".
-- ------------------------------------------------------------------------- Jesse I Pollard, II Email: jesse@cats-chateau.net
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