Re: dscheck(#ar/2): negative b_blkno error on FreeBSD-4.10-STABLE
From: Vladimir Zhurov (vzhurov_at_uwo.ca)
Date: 06/30/04
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- In reply to: Doug White: "Re: dscheck(#ar/2): negative b_blkno error on FreeBSD-4.10-STABLE"
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Date: Wed, 30 Jun 2004 16:01:57 -0400 To: freebsd-stable@freebsd.org
Thank you for reply.
As file system problems started to pile up I have decided to re-format
and restore from backups. I have tested all four HDD's in array using WD
diagnostic utility and extended test did not find any problems.
So I attempted to re-initialize array using the following method from
the handbook (section 13.3.2.2 from "Adding disks" section (with
modifications at newfs stage)):
# dd if=/dev/zero of=/dev/ar0 count=2
# disklabel /dev/ar0 | disklabel -BrR ar0 /dev/stdin
# newfs -U /dev/ar0c
However, if I would run fsck /dev/ar0c it would immediately report
hundreds of partially allocated inodes.
fdisk ar0 reports the following:
******* Working on device /dev/ar0 *******
parameters extracted from in-core disklabel are:
cylinders=19452 heads=255 sectors/track=63 (16065 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=19452 heads=255 sectors/track=63 (16065 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
<UNUSED>
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 0, size 50000 (24 Meg), flag 80 (active)
beg: cyl 0/ head 0/ sector 1;
end: cyl 1023/ head 255/ sector 63
Is it controller/cable/some other hardware problem or is it software
related and I am just doing something wrong?
Vlad.
>>dmesg.today:
>>dscheck(#ar/2): negative b_blkno -1721888480
>>
>>messages:
>>/kernel: dscheck(#ar/2): negative b_blkno -1721888480
>
>
> I've seen this if the array or partition table is corrupted. The check is
> at the front of dscheck() in src/sys/kern/subr_diskslice.c. You might
> make sure your raid array is functioning normally and the fdisk table
> hasn't been spammed.
>
>
>>Does anyone know what is the reason for such error and whether it is
>>critical?
>
>
> It shouldn't happen -- you might go exploring with fdisk(8).
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- Previous message: Ivan Voras: "Re: Apache2 threaded MPM?"
- In reply to: Doug White: "Re: dscheck(#ar/2): negative b_blkno error on FreeBSD-4.10-STABLE"
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