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List:       freebsd-scsi
Subject:    Re: b_bcount 36 is not on a sector boundary
From:       "Kenneth D. Merry" <ken () kdm ! org>
Date:       2001-11-18 19:37:43
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On Sun, Nov 18, 2001 at 11:47:03 +0000, Len Conrad wrote:
> FreeBSD 4.4 Release, dmesg is showing:
> 
> ahc0: <Adaptec aic7899 Ultra160 SCSI adapter> port 0xdc00-0xdcff mem 
> 0xfeaff000-0xfeafffff irq 5 at device 5.0 on pci2
> aic7899: Ultra160 Wide Channel A, SCSI Id=7, 32/255 SCBs
> ahc1: <Adaptec aic7899 Ultra160 SCSI adapter> port 0xd800-0xd8ff mem 
> 0xfeafe000-0xfeafefff irq 3 at device 5.1 on pci2
> aic7899: Ultra160 Wide Channel B, SCSI Id=7, 32/255 SCBs
> pcib3: <ServerWorks host to PCI bridge> on motherboard
> ...
> da0: <SEAGATE ST318305LC 2202> Fixed Direct Access SCSI-3 device
> da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit), Tagged Queueing 
> Enabled
> da0: 17366MB (35566478 512 byte sectors: 255H 63S/T 2213C)
> Mounting root from ufs:/dev/da0s1a
> dscheck(#da/2): b_bcount 36 is not on a sector boundary (ssize 512)
> dscheck(#da/2): b_bcount 36 is not on a sector boundary (ssize 512)
> dscheck(#da/2): b_bcount 36 is not on a sector boundary (ssize 512)
> dscheck(#da/2): b_bcount 36 is not on a sector boundary (ssize 512)
> dscheck(#da/2): b_bcount 36 is not on a sector boundary (ssize 512)
> dscheck(#da/2): b_bcount 36 is not on a sector boundary (ssize 512)
> 
> Is this hardware, driver ?
> 
> This is a dedicated FreeBSD + postfix + Kaspersky + avcheck anti-virus mail 
> relay box.   We can send 100's of msgs through it and no errors.  We send 
> one msg with a virus attached, and the above error occurs.
> 
> Form what I can find on google, this error seems related to SCSI driver, 
> but that was for FreeBSD 4.0, not 4.4.
> 
> I'd appreciate some feedback.  The client is on the verge of deciding 
> FreeBSD doesn't support his new Dell hardware.

Something is attempting to do I/O to da0c that isn't a sector multiple in
size.

In general, this probably means that something is accessing the raw device,
since the filesystem code shouldn't be doing I/O that isn't a sector
multiple.

Do you have some application that is doing raw I/O to the drive?

Ken
-- 
Kenneth Merry
ken@kdm.org

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