Re: mkfs.xfs doesn't detect size of storage correctly

Eric Sandeen
2008-01-29T20:14:38Z

Matthias Schniedermeyer wrote:
> I just found a workaround. :-)
> As can be seen above the agcount is 3.
>
> For a reason that lays years in the past, when there were issues with
> the agcount (actually agsize), that to the best of my knowledge are
> fixed years ago (but still cause a weird feeling whenever i see that
> word) i just tried '-d agcount=4'
>
> #> mkfs.xfs -l size=1024b -d agcount=4 /dev/loop6 -f
> meta-data=/dev/loop6 isize=256 agcount=4, agsize=45785912 blks
> = sectsz=512 attr=2
> data = bsize=4096 blocks=183143645, imaxpct=25
> = sunit=0 swidth=0 blks
> naming =version 2 bsize=4096
> log =internal log bsize=4096 blocks=32768, version=2
> = sectsz=512 sunit=0 blks, lazy-count=0
> realtime =none extsz=4096 blocks=0, rtextents=0
>
> As can be seen the "blocks"-number is much higher.
>
> #> df -k /mnt
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/loop6 732570484 4256 732566228 1% /mnt
>
> matches(tm) with the loop-size.
>

Ohh.. um... Barry? problems :)

[root@magnesium tmp]# mkfs.xfs -dfile,name=xfsfile,size=750156369920
meta-data=xfsfile isize=256 agcount=3, agsize=45785911
blks
= sectsz=512 attr=2
data = bsize=4096 blocks=137357733, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096
log =internal log bsize=4096 blocks=32768, version=2
= sectsz=512 sunit=0 blks, lazy-count=0
realtime =none extsz=4096 blocks=0, rtextents=0
[root@magnesium tmp]# bc
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
137357733*4096
562617274368

ouch... that's, um, not the right size :)

-Eric