Melancon, Ruddy wrote:
We are currently doing Global Mirroring creating a "consistency group" every 30 seconds. What impact will this have during a recovery situation when we implement zVM and zLinux. The concern is in regard to Linux caching of output and the potential loss of disk metadata. Can we be assured that Linux will recover during a disaster situation. We do plan on doing a flashcopy of Linux volumes after placing the Linux images in single user mode.
The question of copying Linux filesystems while the system is live has been debated here many times. You cannot use external facilities to copy a Linux filesystem while it's mounted, maybe even when it's mounted ro as even then,there may be some filesystem errors corrected (for example, consider running fsck which can only be run on a filesystem when it's mounted ro). There is nothing an external device, such as a storage controller, having any idea of what's in the Penguin's head. I have cloned Linux filesystems while they're mounted, even when rw, and got away with it, but then I wasn't betting the bank on it either. I'd never do it for something where my future employment or bank deposits were at risk. I'm sure Google can help you find previous discussions. Key words to look for include clone, backup, flashcopy, linux. -- Cheers John -- spambait 1aaaa...@coco.merseine.nu z1aaaa...@coco.merseine.nu -- Advice http://webfoot.com/advice/email.top.php http://www.catb.org/~esr/faqs/smart-questions.html http://support.microsoft.com/kb/555375 You cannot reply off-list:-) ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
