On 4/5/06, Alan Altmark <[EMAIL PROTECTED]> wrote: > Image backups like that won't do what you want. Linux has data in its > internal buffer cache that needs to be written to dasd and that only > happens when you unmount the filesystem from Linux or shut Linux down.
There's one of the magic SysRq keys that will force Linux to synch the disks (i.e. write out all that should have been written out). We could probably wire that to some external rupt, but I have no idea how good that would be. Alternatively, provided the server does get periods of idleness, a z/VM performance monitor could spot that moment. There's timer driven write-out of dirty pages, and when Linux has not been writing data for more than 30 seconds (or whatever it's set) we know it has no such desire anymore. That might be the moment to flash the disks. Rob -- Rob van der Heij Velocity Software, Inc ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
