I vaguely seem to recall that there's some thing you want to watch for. there are some journaling options or something. There are, like, three ways to journal and if you turn some of them on your performance will be terrible. It might even be that one of the ways is the default. Anyone know about this?
"You do not need a parachute to skydive. You only need a parachute to skydive twice." -Motto of the Darwin Society Gordon W. Wolfe, Ph.D. (425) 865-5940 VM Technical Services, The Boeing Company > ---------- > From: Malcolm Beattie > Reply To: Linux on 390 Port > Sent: Friday, April 26, 2002 3:12 PM > To: [EMAIL PROTECTED] > Subject: Re: Process to move to a jfs on an existing system > > Post, Mark K writes: > > Creating a Reiser or ext3 file system involves issuing the mkfs command. > By > > definition, that will clobber your data. > > You *can* upgrade simply and in-place from an ext2 filesystem to > an ext3 filesystem, even with the filesystem mounted. I've seen > documentation saying that RedHat provide a front-end for doing it via > "rhsetup" and "loader" on Linux for S/390 and zSeries but I haven't > tried that myself. > > The actual commands to do it are just > # tune2fs -j /dev/dasdXN > where /dev/dasdXN is the device for the filesystem you want to change. > That adds a journal (with the default parameters--use the -J option to > specify non-default ones) to the filesystem. See "man tune2fs".If the > filesystem is currently mounted, you'll see a file called ".journal" > appear at the top of that filesystem. Then edit the line for that > filesystem in /etc/fstab, changing "ext2" to "ext3". You can also add > a "data=..." to the options field to change the journalling mode. > See the "Mount options for ext3" section of "man mount" for details. > > Obviously you need a kernel with ext3 support in it to support all > this (and recent versions of the userland utility packages to support > the right options and documentation). If you're wanting tricksy mount > options for the root filesystem then you need to play with kernel > command line arguments, otherwise it should be plain sailing. > > --Malcolm > > -- > Malcolm Beattie <[EMAIL PROTECTED]> > Linux Technical Consultant > IBM EMEA Enterprise Server Group... > ...from home, speaking only for myself > >
