Marc LE DOUARAIN wrote: > It's a good question... > > We are also working on a project where we will have the same problem in the near >future... > > But it doesn't help! > > Well, for now, I think that closing all the files opened is the minimum to do. > Making a sync command should be usefull to ensure that the files have been really >written on disk. If all the files are closed, will the system still perform an fsck. > > > Using ext3 filesystem available now, can be usefull to avoid long fsck at the start. I looked at this. It seems like it would do the trick. For a small partition, the fsck is short. What I really care about is not having to perform user interaction as sometimes happens with a corrupt file system. Does ext3 guarantee this? > > > Making an umount before power failure will ensure that all is ok for next start, but >will you have time to do all this? > 20 ms seems to be really short... for all that :-( > We are lucky, we will have a little battery with few seconds of autonomy... > > You can use a fifo to drive all this user space commands from RT world. This would definitely require a battery to do this. Can you recommend an inexpensive battery solution. Thanks, Dan Peters > > > If people have other ideas... > Many thanks. > > >>> [EMAIL PROTECTED] 15/02/02 20h56 >>> > Hi, > does anyone have any suggestions for umounting a small (about 30Mb) file > system from rtl space? > The user process is running in ramdisk and is subject to sudden power > loss. I would like to log some data on the partition, but must be > certain, that the system will start up without fsck. My thought is to > install a rtl interrupt which then generates a soft interrupt which > umonts the disk. The power supply can detect power failure and generate > the interrupt. I have measured about 20 ms before power drops below a > usable state. > > Also, is it necessary that the file system be umounted, or is just > closing all open files? > > thanks, > > dan peters > > -- [rtl] --- > To unsubscribe: > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > -- > For more information on Real-Time Linux see: > http://www.rtlinux.org/ > > -- [rtl] --- > To unsubscribe: > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > -- > For more information on Real-Time Linux see: > http://www.rtlinux.org/ -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] -- For more information on Real-Time Linux see: http://www.rtlinux.org/
