On Jul 08, 2005 10:33 -0700, ha haha wrote: > > I accidentally issued "mkswap" on a used ext3 fs > > partition (~30G) :-/ > > > > I have analyzed the behaviour of mkswap using two > > test files and it > > appears to only change "some" bytes: > > --8<-- > > --- swap2.xxd 2005-07-04 21:00:10.157261360 +0200 > > +++ swap1.xxd 2005-07-04 21:00:01.894517488 +0200 > > @@ -62,7 +62,7 @@ > > 00003d0: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > 00003e0: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > 00003f0: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > -0000400: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > +0000400: 0100 0000 ff09 0000 0000 0000 0000 0000 > > ................ > > 0000410: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > 0000420: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > 0000430: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > @@ -253,7 +253,7 @@ > > 0000fc0: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > 0000fd0: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > 0000fe0: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > -0000ff0: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > +0000ff0: 0000 0000 0000 5357 4150 5350 4143 4532 > > ......SWAPSPACE2 > > 0001000: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > 0001010: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > 0001020: 0000 0000 0000 0000 0000 0000 0000 0000 > > ................ > > --8<-- > > > > Here is the output of 'fsck.ext3 -n -v hdb1.img': > > --8<-- > > e2fsck 1.35 (28-Feb-2004) > > Couldn't find ext2 superblock, trying backup > > blocks... > > hdb1.img was not cleanly unmounted, check forced. > > Pass 1: Checking inodes, blocks, and sizes > > Pass 2: Checking directory structure > > Pass 3: Checking directory connectivity > > Pass 4: Checking reference counts > > Pass 5: Checking group summary information > > Free blocks count wrong for group #0 (24043, > > counted=0). > > Fix? no > > > > Free blocks count wrong for group #1 (32250, > > counted=0). > > Fix? no Should have read original email better. This is only be blocks count summary, which is never up-to-date on a backup superblock+group descriptor. The checking shows everything is OK. A good time to make a backup! Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. _______________________________________________ Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
