Just to say that this isn't the only possible cause. We got these errors
when attaching an L280 to a U10. After an awful lot of phone calls, h/w
swapping, checking for diferential vs single-ended cables and so on, it
turned out that the short SCSI jumper cable between the two sides (ie
between the drive and the robotics) was duff.

TTFN,
 Richard Hall

On Thu, 5 Oct 2000, Donna Nadimi wrote:

> I ran into this exact problem recently!  I'm happy to share.
> 
> The cause of this is that you have too many drives daisy-chained together.  
> If you have more than two drives per SCSI bus, you get these data in parity
> errors.
> 
> The only good solution is to unchain the drives.  I've found that two drives
> chained
> together (and the robot) work well.  Anymore than that and you have a
> transfer speed
> problem between the Sun scsi controller and the drives.  
> 
> Good luck.
> 
> --donna
> 
> Donna Nadimi
> UNIX Systems Engineer
> Lucasfilm Ltd.
> donna.nadimi AT lucasfilm DOT com
> 
> 
> 
> 
> -----Original Message-----
> From: Everett, Craig [mailto:Craig_Everett AT intuit DOT com]
> Sent: Thursday, October 05, 2000 7:23 PM
> To: 'veritas-bu AT mailman.eng.auburn DOT edu'
> Cc: SD SA Backup
> Subject: [Veritas-bu] Parity Errors flooding /var/adm/messages on
> Solaris 2.6
> 
> 
> I've got a large environment using Netbackup 3.2 installed on mostly Sun
> E-450's running Solaris 2.6. 
> 
> These servers are attached to StorageTek 9740's and L700's using DLT7000's.
> 
> These servers are experiencing a flood of SCSI parity errors when the
> DLT7000 drives are initialized.
> 
> Sun doesn't seem to know what is causing this issue. We tried to apply a Sun
> SUNWpd patch with no relief.
> 
> Has anyone else seen anything remotely similar to this and if so what did
> you do to resolve this issue. 
> 
> Below is an example of what I'm seeing.
> 
> 
> Oct  5 11:25:30 hostname unix: WARNING: /pci@6,4000/scsi@3 (glm4):
> Oct  5 11:25:30 hostname unix:  SCSI bus DATA IN phase parity error
> Oct  5 11:25:30 hostname unix: WARNING: ID[SUNWpd.glm.parity_check.6010]
> Oct  5 11:25:30 hostname unix: WARNING: /pci@6,4000/scsi@3 (glm4):
> Oct  5 11:25:30 hostname unix:  Target 5 reducing sync. transfer rate
> Oct  5 11:25:30 hostname unix: WARNING:
> ID[SUNWpd.glm.sync_wide_backoff.6014]
> Oct  5 11:25:30 hostname unix: WARNING: /pci@6,4000/scsi@3 (glm4):
> Oct  5 11:25:30 hostname unix:  SCSI bus DATA IN phase parity error
> Oct  5 11:25:30 hostname unix: WARNING: ID[SUNWpd.glm.parity_check.6010]
> Oct  5 11:25:30 hostname unix: WARNING: /pci@6,4000/scsi@3 (glm4):
> Oct  5 11:25:30 hostname unix:  SCSI bus DATA IN phase parity error
> Oct  5 11:25:30 hostname unix: WARNING: ID[SUNWpd.glm.parity_check.6010]
> Oct  5 11:25:30 hostname unix: WARNING: /pci@6,4000/scsi@3 (glm4):
> Oct  5 11:25:30 hostname unix:  SCSI bus DATA IN phase parity error
> Oct  5 11:25:30 hostname unix: WARNING: ID[SUNWpd.glm.parity_check.6010]
> Oct  5 11:25:30 hostname unix: WARNING: /pci@6,4000/scsi@3 (glm4):
> Oct  5 11:25:30 hostname unix:  SCSI bus DATA IN phase parity error
> 
> Thanks,
> 
> 
> Craig Everett
> Intuit INC
> San Diego
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