zfs discuss - Dec 2010 - Understanding Disk Errors

I am trying to understand the various error conditions reported by iostat.  I
noticed during a recent scrub that my transport errors were increasing. 
However, after a fair amount of searching I am unsure if that indicates a drive
failure or not.  I also have a lot of illegal request errors.  Not sure if those
are indicative of any sort of "real" failure.

Here is the output from iostate -E:
iostat -E
sd3       Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: ST9160412AS      Revision: LVM1 Serial No:  
Size: 160.04GB <160041885696 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 0 Predictive Failure Analysis: 0 
sd4       Soft Errors: 0 Hard Errors: 5 Transport Errors: 49 
Vendor: ATA      Product: SAMSUNG HD103SJ  Revision: 0001 Serial No:  
Size: 1000.20GB <1000204886016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 5 Recoverable: 0 
Illegal Request: 0 Predictive Failure Analysis: 0 
sd8       Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD103SJ  Revision: 0001 Serial No:  
Size: 1000.20GB <1000204886016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 0 Predictive Failure Analysis: 0 
sd10      Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD103SJ  Revision: 0001 Serial No:  
Size: 1000.20GB <1000204886016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 5998 Predictive Failure Analysis: 0 
sd12      Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: ST9160412AS      Revision: LVM1 Serial No:  
Size: 160.04GB <160041885696 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 34 Predictive Failure Analysis: 0 
sd13      Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD103SJ  Revision: 0001 Serial No:  
Size: 1000.20GB <1000204886016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 5998 Predictive Failure Analysis: 0 
sd14      Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD103SJ  Revision: 0001 Serial No:  
Size: 1000.20GB <1000204886016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 5998 Predictive Failure Analysis: 0 
sd16      Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD103SJ  Revision: 0001 Serial No:  
Size: 1000.20GB <1000204886016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 0 Predictive Failure Analysis: 0 
sd19      Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: WDC WD10EACS-00Z Revision: 1B01 Serial No:  
Size: 1000.20GB <1000204886016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 0 Predictive Failure Analysis: 0 


Here is the output in a more readable, but less detailed form from
someone''s zfs-stats.sh script:
 ./zfs-stats.sh 
Disk       Vendor     Model                          Serial           Firmware  
Totl Soft Hard Trns Meda NotR NoDv Rble Ilgl Fail ZPool
c6t4d0                                                                          
0    0    0    0    0    0    0    0    0    0    rpool
c6t7d0     SAMSUNG    HD103SJ                        S246JDWZ408066   1AJ10001  
59   0    5    49   0    0    5    0    0    0    tank
c4t17d0    SAMSUNG    HD103SJ                        S246JDWZ408064   1AJ10001  
0    0    0    0    0    0    0    0    0    0    tank
c10t2d0    SAMSUNG    HD103SJ                        S246JDWZ408074   1AJ10001  
5998 0    0    0    0    0    0    0    5998 0    tank
c10t4d0                                                                         
34   0    0    0    0    0    0    0    34   0    rpool
c10t5d0    SAMSUNG    HD103SJ                        S246JDWZ408065   1AJ10001  
5998 0    0    0    0    0    0    0    5998 0    tank
c10t1d0    SAMSUNG    HD103SJ                        S246JDWZ408075   1AJ10001  
5998 0    0    0    0    0    0    0    5998 0    tank
c4t18d0    SAMSUNG    HD103SJ                        S246JDWZ408073   1AJ10001  
0    0    0    0    0    0    0    0    0    0    tank
c6t10d0                                                                         
0    0    0    0    0    0    0    0    0    0


Are these transport errors anything to be worried about?
-- 
This message posted from opensolaris.org

----- Original Message -----
> I am trying to understand the various error conditions reported by
> iostat. I noticed during a recent scrub that my transport errors were
> increasing. However, after a fair amount of searching I am unsure if
> that indicates a drive failure or not. I also have a lot of illegal
> request errors. Not sure if those are indicative of any sort of
"real"
> failure.
with all those ''invalid'' errors, I think I would have started
off checking the backplane if you have such a thing. Looks like something is bad
there.

Vennlige hilsener / Best regards

roy
--
Roy Sigurd Karlsbakk
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roy at karlsbakk.net
http://blogg.karlsbakk.net/
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