SAS Disk path

saranraj456 — Thu, 05 Jun 2025 06:22:16 GMT

HI Frndz,

After disk addition, I see there are difference in the output ( check primary and secondary path)

On controller1

0a shows as primary for all disks and 3a shows as secondary for all disks

whereas on controller2

0a shows a primary for some disks and 3a shows as primary for some disks

0a shows a secondary for some disks and 3a shows as secondary for some disks

SB001*> storage show disk -p

PRIMARY PORT SECONDARY PORT SHELF BAY

-------- ---- --------- ---- ---------

0a.10.0 A 3a.10.0 B 10 0

0a.10.1 A 3a.10.1 B 10 1

0a.10.2 A 3a.10.2 B 10 2

0a.10.3 A 3a.10.3 B 10 3

0a.10.4 A 3a.10.4 B 10 4

0a.10.5 A 3a.10.5 B 10 5

0a.10.6 A 3a.10.6 B 10 6

0a.10.7 A 3a.10.7 B 10 7

0a.10.8 A 3a.10.8 B 10 8

0a.10.9 A 3a.10.9 B 10 9

0a.10.10 A 3a.10.10 B 10 10

0a.10.11 A 3a.10.11 B 10 11

0a.10.12 A 3a.10.12 B 10 12

0a.10.13 A 3a.10.13 B 10 13

0a.10.14 A 3a.10.14 B 10 14

0a.10.15 A 3a.10.15 B 10 15

0a.10.16 A 3a.10.16 B 10 16

0a.10.17 A 3a.10.17 B 10 17

0a.10.18 A 3a.10.18 B 10 18

0a.10.19 A 3a.10.19 B 10 19

0a.10.20 A 3a.10.20 B 10 20

0a.10.21 A 3a.10.21 B 10 21

0a.10.22 A 3a.10.22 B 10 22

0a.10.23 A 3a.10.23 B 10 23

0a.11.0 A 3a.11.0 B 11 0

0a.11.1 A 3a.11.1 B 11 1

0a.11.2 A 3a.11.2 B 11 2

0a.11.3 A 3a.11.3 B 11 3

0a.11.4 A 3a.11.4 B 11 4

0a.11.5 A 3a.11.5 B 11 5

0a.11.6 A 3a.11.6 B 11 6

0a.11.7 A 3a.11.7 B 11 7

0a.11.8 A 3a.11.8 B 11 8

0a.11.9 A 3a.11.9 B 11 9

0a.11.10 A 3a.11.10 B 11 10

0a.11.11 A 3a.11.11 B 11 11

0a.11.12 A 3a.11.12 B 11 12

0a.11.13 A 3a.11.13 B 11 13

0a.11.14 A 3a.11.14 B 11 14

0a.11.15 A 3a.11.15 B 11 15

0a.11.16 A 3a.11.16 B 11 16

0a.11.17 A 3a.11.17 B 11 17

0a.11.18 A 3a.11.18 B 11 18

0a.11.19 A 3a.11.19 B 11 19

0a.11.20 A 3a.11.20 B 11 20

0a.11.21 A 3a.11.21 B 11 21

0a.11.22 A 3a.11.22 B 11 22

0a.11.23 A 3a.11.23 B 11 23

SB002> storage show disk -p

PRIMARY PORT SECONDARY PORT SHELF BAY

-------- ---- --------- ---- ---------

3a.10.0 B 0a.10.0 A 10 0

3a.10.1 B 0a.10.1 A 10 1

3a.10.2 B 0a.10.2 A 10 2

3a.10.3 B 0a.10.3 A 10 3

3a.10.4 B 0a.10.4 A 10 4

3a.10.5 B 0a.10.5 A 10 5

3a.10.6 B 0a.10.6 A 10 6

3a.10.7 B 0a.10.7 A 10 7

3a.10.8 B 0a.10.8 A 10 8

3a.10.9 B 0a.10.9 A 10 9

3a.10.10 B 0a.10.10 A 10 10

3a.10.11 B 0a.10.11 A 10 11

3a.10.12 B 0a.10.12 A 10 12

3a.10.13 B 0a.10.13 A 10 13

3a.10.14 B 0a.10.14 A 10 14

3a.10.15 B 0a.10.15 A 10 15

3a.10.16 B 0a.10.16 A 10 16

3a.10.17 B 0a.10.17 A 10 17

3a.10.18 B 0a.10.18 A 10 18

3a.10.19 B 0a.10.19 A 10 19

3a.10.20 B 0a.10.20 A 10 20

3a.10.21 B 0a.10.21 A 10 21

3a.10.22 B 0a.10.22 A 10 22

3a.10.23 B 0a.10.23 A 10 23

0a.11.0 A 3a.11.0 B 11 0

0a.11.1 A 3a.11.1 B 11 1

0a.11.2 A 3a.11.2 B 11 2

0a.11.3 A 3a.11.3 B 11 3

0a.11.4 A 3a.11.4 B 11 4

0a.11.5 A 3a.11.5 B 11 5

0a.11.6 A 3a.11.6 B 11 6

0a.11.7 A 3a.11.7 B 11 7

0a.11.8 A 3a.11.8 B 11 8

0a.11.9 A 3a.11.9 B 11 9

0a.11.10 A 3a.11.10 B 11 10

0a.11.11 A 3a.11.11 B 11 11

0a.11.12 A 3a.11.12 B 11 12

0a.11.13 A 3a.11.13 B 11 13

0a.11.14 A 3a.11.14 B 11 14

0a.11.15 A 3a.11.15 B 11 15

0a.11.16 A 3a.11.16 B 11 16

0a.11.17 A 3a.11.17 B 11 17

0a.11.18 A 3a.11.18 B 11 18

0a.11.19 A 3a.11.19 B 11 19

0a.11.20 A 3a.11.20 B 11 20

0a.11.21 A 3a.11.21 B 11 21

0a.11.22 A 3a.11.22 B 11 22

0a.11.23 A 3a.11.23 B 11 23

Why there is a variation in the primary & Secondary port..?

Regards,
Saran

Re: SAS Disk path

AGUMADAVALLI — Thu, 26 Jul 2012 18:19:24 GMT

The simple answer is multipathing. if you observe any errors, download wireguage and run it.

Thank you,

Ak G

Re: SAS Disk path

saranraj456 — Thu, 26 Jul 2012 19:02:43 GMT

Multipathing is fine,but i just need to know why there is a change in primary & secondary path between controllers..?

Regards,
Saran

Re: SAS Disk path

ARCOHAKNL — Thu, 26 Jul 2012 19:17:04 GMT

Saran,

Your filers accesing the disks by the stack.

As you can see for example, drive 3a.10.0 is the same as 0a.10.0

What happens is that the data stream is going the stack in by the same shelf.

This is for both filers, just the module is different, mod A fo SB001, mod B for SB002

Nothing to worry, this is normal behaviour.

Cheers,

Arco

SB001*> storage show disk -p

PRIMARY PORT SECONDARY PORT SHELF BAY

-------- ---- --------- ---- ---------

0a.10.0 A 3a.10.0 B 10 0

SB002> storage show disk -p

PRIMARY PORT SECONDARY PORT SHELF BAY

-------- ---- --------- ---- ---------

3a.10.0 B 0a.10.0 A 10 0

Re: SAS Disk path

saranraj456 — Fri, 27 Jul 2012 10:01:32 GMT

What is the factor determines primary and secondary port?

Re: SAS Disk path

saranraj456 — Fri, 27 Jul 2012 13:00:33 GMT

is that the difference is due to cabling?

Re: SAS Disk path

saranraj456 — Mon, 20 Aug 2012 05:52:54 GMT

I heard the diff is bcoz of load balancing ops by ontap, does any one know how it will do ?

I dont believe it could be the reason.

Saran

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