Saving / copying RFS (to move to another plug)

[creeble]

Okay, I'm thinking I know how to do this, but then again, maybe not

I have a rootfs on flash that I like (this is a guruplug, fwiw).  I now want to install it on other plugs.  How do I copy it off?

I did a nanddump -f rootfs.ubi.img /dev/mtd2 (to a USB stick), which created a ~512MB file.  But the original rootfs image was on the order of ~275MB, and I didn't add more than a few dozen MB.  I guess I don't mind copying the whole thing and flashing it to the new plug, but is there a way I can tell how big the current UBI fs is?  And just nanddump that?

Any help appreciated, I'm afraid of bricking another plug....

[sfzhi]

is there a way I can tell how big the current UBI fs is?  And just nanddump that?

No. The data is usually spread throughout the flash and you would have to cherry-pick individual blocks.

You could just copy the file system contents using tar or cpio to another Linux machine and create a new UBI image there.

[creeble]

Thanks, I understand.  cpio / tar it is!

Eric.