Messages in this thread | | | Date | Sat, 11 Dec 1999 21:26:21 +0100 (MET) | From | David Weinehall <> | Subject | Re: Ext3 Filesystem |
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On 10 Dec 1999, Peter Samuelson wrote:
> > [Dr. Michael Weller <eowmob@exp-math.uni-essen.de>] > > I mean, what you really want is: have the journal on a separate > > partition with no filesystem at all. Best of all on a seperate disk > > (controller, maybe). And you might want to have one journal only for > > all filesystems. > > AIX does this. There is one journal LV (logical volume) for each VG > (volume group). This (rather than one journal per whole system) is > because the VG is intended to be the unit of portability, i.e. you can > eject a ZIP disk with a VG on it and the VG on it will work elsewhere. > AIX's JFS is restricted to the LV/VG universe (it starts calling you > nasty names if you try to create one on just any old block device), so > this scheme works well. > > I don't think AIX makes any effort to load-balance the log between > physical disks. It can't -- the size of the journal LV is the minimum. > > I agree that for load-balancing reasons it would be nice if ext3 moved > in the direction of supporting journal-outside-fs and even a shared > journal blockdev.
Well, considering that we have (or at least are going to have) an LVM for Linux too, I believe we should do in the same manner IBM did with AIX...
/David Weinehall _ _ // David Weinehall <tao@acc.umu.se> /> Northern lights wander \\ // Project MCA Linux hacker // Dance across the winter sky // \> http://www.acc.umu.se/~tao/ </ Full colour fire </
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