SAS Connectivity Monitor: DualPathToDiskShelf_Alert

[xiatian]

hi, everyone:

       could you help me solve the following  question ?  what's wrong the box ?   

<LR d="01May2021 04:03:22" n="B-BACKUP-SPA" t="1619813002" id="0/3762391351297" p="2" s="Ok" o="mgwd" vf="" type="1" seq="1208529" >
<callhome_hm_sas_alert_major_1
subject="SAS Connectivity Monitor: DualPathToDiskShelf_Alert[50:0a:09:80:04:98:b1:c0]"/>
</LR>

[Fabian1993]

Which ONTAP Version you are using? If you use cDOT try

cluster1::>system health alert show -monitor node-connect -alert-id DualPathToDiskShelf_Alert -
instance

and you will get a Field called

Corrective Actions:

[xiatian]

NetApp Release 8.1.3P3 7-Mode: Sun Sep 22 22:29:18 PDT 2013

[Fabian1993]

Send the node shell output of
sadadmin expander_map

[xiatian]

BET-BACKUP-SPA*> sasadmin expander_map

Expanders on channel 0a:
Level 1: WWN 50050cc10514303f, ID 1, Serial Number ' SHJSG1433000158', Product 'DS424IOM3 ', Rev '0160', Slot A
Level 2: WWN 50050cc105143c7f, ID 2, Serial Number ' SHJSG1433000146', Product 'DS424IOM3 ', Rev '0160', Slot A
Level 3: WWN 50050cc10513c5bf, ID 3, Serial Number ' SHJSG1431000010', Product 'DS424IOM3 ', Rev '0160', Slot A
Level 4: WWN 50050cc105132aff, ID 4, Serial Number ' SHJSG1429000265', Product 'DS424IOM3 ', Rev '0160', Slot A
Level 5: WWN 50050cc10515d57f, ID 6, Serial Number ' SHJSG1445000061', Product 'DS424IOM3 ', Rev '0172', Slot A
Level 6: WWN 50050cc10515dfff, ID 5, Serial Number ' SHJSG1451000194', Product 'DS424IOM3 ', Rev '0160', Slot A

Expanders on channel 0b:
Level 1: WWN 500a0980027ba73f, ID 13, Serial Number ' SHJSG00000004EC', Product 'DS424IOM6 ', Rev '0151', Slot B
Level 2: WWN 500a098004ec0bbf, ID 12, Serial Number ' SHJSG1444000141', Product 'DS424IOM6 ', Rev '0173', Slot B
Level 3: WWN 500a098004df4aff, ID 11, Serial Number ' SHJSG1444000137', Product 'DS424IOM6 ', Rev '0173', Slot B

Expanders on channel 4a:
Cannot Complete operation on channel 4a; Status Not Available.

Expanders on channel 4b:
Level 1: WWN 50050cc10515d03f, ID 5, Serial Number ' SHJSG1451000194', Product 'DS424IOM3 ', Rev '0160', Slot B
Level 2: WWN 50050cc10515d6ff, ID 6, Serial Number ' SHJSG1445000061', Product 'DS424IOM3 ', Rev '0172', Slot B
Level 3: WWN 50050cc1051339ff, ID 4, Serial Number ' SHJSG1429000265', Product 'DS424IOM3 ', Rev '0160', Slot B
Level 4: WWN 50050cc10513ca7f, ID 3, Serial Number ' SHJSG1431000010', Product 'DS424IOM3 ', Rev '0160', Slot B
Level 5: WWN 50050cc1051423bf, ID 2, Serial Number ' SHJSG1433000146', Product 'DS424IOM3 ', Rev '0160', Slot B
Level 6: WWN 50050cc105144cbf, ID 1, Serial Number ' SHJSG1433000158', Product 'DS424IOM3 ', Rev '0160', Slot B

Expanders on channel 4c:
Level 1: WWN 500a098004ebf8bf, ID 11, Serial Number ' SHJSG1444000137', Product 'DS424IOM6 ', Rev '0173', Slot A
Level 2: WWN 500a098004ec0dbf, ID 12, Serial Number ' SHJSG1444000141', Product 'DS424IOM6 ', Rev '0173', Slot A
Level 3: WWN 500a0980027b487f, ID 13, Serial Number ' SHJSG00000004EC', Product 'DS424IOM6 ', Rev '0151', Slot A

[paul_stejskal]

Sometimes this can happen if there is any maintenance going on. It seems kind of delicate at times so it may be a false positive. If you don't see the alert constantly that means it's transient and not an issue.

[pedro_rocha]

Hi,

Following what Fabian said post here the hole output if you still have any doubt.

Normally, that message is one of the two below: 

1 - Single path from controller to disk shelf (you gotta add another path);

2 - Dual path where both paths come from the same SAS ASIC (for example: in a FAS8200 controller there are 4 onboard SAS ports (0a, 0b, 0c and 0d). 0a and 0b share the same ASIC, as 0c and 0d also do. So the best is to use 0a and 0c as dual paths to a disk shelf/stack instead of 0a and 0b).

Regards,

Pedro Rocha

[ttran · Accepted solution]

Hello @xiatian ,

The output you provided for "sasadmin expander_map" does show two paths to every shelf. The error you provided looks like the reporting node for the error is "B-BACKUP-SPA" which you can login directly to the node and run "storage show fault -v" to see if there are any existing shelf errors that need attention.

As @paul_stejskal mentioned, if maintenance was occurring on May 1, 2021 @ that impacted the physical link then you will see this Alert. You can look in the same EMS log around the same timeframe of the original error "01May2021 04:03:22" message, which would show you specifically which adapter and shelf or expander was reporting the link fault.

Regards,

Team NetApp