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Old 06-09-2009, 09:55 AM   #1
bluepenguine
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Question root filesystem on RAM


Hello , I want to do following things....

I have working debian 4.0 root filesystem on CF disk..it boots properly everything is fine...

I want to creat some type of configuration with which , rootfilesystem will be created(or mounted) in RAM what ever any application will write to file , it should write on ram.....not on disk. and when i want to have persistant storage then modification done would be stored on CF disk....

rootfilesystem should be created after bootloader...not after init...as it will save time....
I dont want to have NFS ...for some reason...

may be some information on ext2/3 on RAM ..etc..

any reference will do gud for me ...



this i want to have for embedded project..where due to power failure i am loosing CF cards...

thanks in advance..
 
Old 06-09-2009, 10:24 AM   #2
linus72
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Tinycore, DSL etc shoot the root fs into RAM
I suggest tinycore, very nice; changes are only written back when you backup or add an app, etc.
use ext2/grub or fat32/syslinux
 
Old 06-10-2009, 01:23 AM   #3
bluepenguine
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Quote:
Originally Posted by linus72 View Post
Tinycore, DSL etc shoot the root fs into RAM
I suggest tinycore, very nice; changes are only written back when you backup or add an app, etc.
use ext2/grub or fat32/syslinux
I dont want to use any other distribution , as I have to spend more time in learning internal of those disrtibution(tiny core...etc)..
I have working filesystem on CF but which uses Ext3 filesystem type.
I just want to have minimal linux textual based, filesystem on Ram.
 
Old 06-10-2009, 03:42 AM   #4
Agrouf
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You've got to mount a tmpfs filesystem somewhere. Then you can copy the content of / from the CF card there and use use mount --move to remount / on your new file system. Or, if you want to do it very early, you have to modify your linuxrc file (it may be another file depending on your distro) and use pivot_root if you are using nash. You can then make a script to commit changes by copying back the content of the tmpfs filesystem to your CF card.
This is the quickest and easiest way to do it I believe. You can also do it with aufs or unionfs.
BTW I believe ext3 is a bad idea on CF cards. You should use ubifs instead...

Last edited by Agrouf; 06-10-2009 at 03:49 AM.
 
  


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