need some help with bad df

Kresimir Sparavec kreso at k.plenum.de
Mon Oct 25 03:46:00 CDT 2004


df
/dev/sdb1            2048615532     32832 2048582700   1% /raid1
/dev/sdc1            2050690816     32840 2050657976   1% /raid2
df -i
/dev/sdb1            16022528      12 16022516    1% /raid1
/dev/sdc1            4294967295       0 4294967295    0% /raid2

these are two 2TB partitions on external RAID arrays, /dev/sdb1 formatted as
ext3, /dev/sdc1 as reiser3 under 2.4.27 vanilla kernel. the number of inodes
on /dev/sdb1 is reduced from what would be default. I guess >1TB problems
were fixed in vanilla kernel somewhere down the road after 2.4.20.


On Mon, Oct 25, 2004 at 09:14:48AM +0100, Mark Watts wrote:
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> 
> > On Sun, Oct 24, 2004 at 10:03:18AM -0400, Jim Greene wrote:
> > > Hi All,
> > >    All of a sudden I am seeing some strange behavior with one of my
> > > 2650's. Using a Perc4/Dc  Doing a df I am seeing the following:
> > > /dev/sda2             10080520 -73786976294837985280   9793140 101%
> > > /var/log
> > >
> > > wtf is that?
> >
> > This is a quirk of having a >1TB block device, yes?  That df displays
> > incorrect values is one of the known quirks.  For reasons like this
> > (and other similar anomolies which aren't all known), Red Hat doesn't
> > "support" (i.e. their support org won't fix) issues with systems with
> >
> > >1TB block devices, and recommends making smaller block devices.  >1TB
> >
> > block devices will be a RHEL4 (2.6-based kernel) feature.
> >
> > > I am also seeing the iowait being pretty high all of a sudden.  How to I
> > > verify that my read/write cache is on and functioning ?
> >
> > dellmgr/megamgr should be able to tell you.
> >
> > Thanks,
> > Matt
> 
> 
> /dev/scsi/host0/bus0/target1/lun0/part1
>                      1692109088 830185988 775968928  52% /export
> 
> This is a 1.6TB partition, created as a single 13 x 146GB scsi disk raid-5 
> array on a PV220s. Kernel is 2.6.3, filesystem is ext3 (Mandrake 10.0)
> 
> Mark.
> 
> - -- 
> Mark Watts
> Senior Systems Engineer
> QinetiQ Trusted Information Management
> Trusted Solutions and Services group
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