On Sun, 4 Dec 2011 16:28:25 -0600 "Leslie Rhorer" <lrhorer@xxxxxxxxxxx> wrote: > I have a system - one that is not expandable - that has relatively limited > RAM, comparatively speaking, and must boot from a usb stick. The system > hosts a RAID array, but one cannot assume the RAID array is available when > the system boots. IOW, I want to be able to take down the RAID array for > maintenance, possibly booting the system with no array created, at all. > > On the other hand, USB sticks have a limited number of writes available > before they fail, so I don't want the system to be thrashing the flash drive > any more than necessary. At this time, I have /var/run, /var/log, > /var/lock, and /tmp mounted as tmpfs file systems. What I propose is to run > an init script that checks to see if the array is mounted, and if so appends > files in the aforementioned directories to existing directories on the array > and then remounts and binds the directories on the array. The stop call in > the script will reverse the process so the system can shutdown or so I can > take the array offline after booting for maintenance. Is this unwise? Am I > missing something crucial that might cause the system to blow up? Sounds reasonably sane. After the bind mount you would need to make sure any process with a file open in one of those directories re-opens the file. So you might want to restart syslogd. NeilBrown
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