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Latency seen when accessing drives in DS224C/DS2246 mixed shelf stack

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Applies to

  • ONTAP 9
  • DS224C and DS2246

Issue

  • Drive read latency seen when accessing drives on an DS224C shelf via path through DS2246 shelf chassis
  • DS2246 shelf has IOM12 installed, but chassis is still accessing drives at 6Gb/s
Shelf stack example:
 
Expanders on channel 1a:
Level    1: WWN 500a098008116b35, ID 31, Serial Number ' SHFGD0000000003', Product 'DS22412IOM12A   ', Rev '0270', Slot A
Level    2: WWN 500a0980080b0161, ID 32, Serial Number ' SHFGD0000000001', Product 'DS22412IOM12A   ', Rev '0270', Slot A
Level    3: WWN 500a0980081ee179, ID 33, Serial Number ' SHFGD0000000002', Product 'DS224IOM12A     ', Rev '0270', Slot A

Expanders on channel 9b:
Level    1: WWN 500a0980081ddddd, ID 33, Serial Number ' SHFGD0000000002', Product 'DS224IOM12A     ', Rev '0270', Slot B
Level    2: WWN 500a0980080af8a5, ID 32, Serial Number ' SHFGD0000000001', Product 'DS22412IOM12A   ', Rev '0270', Slot B
Level    3: WWN 500a098008116de5, ID 31, Serial Number ' SHFGD0000000003', Product 'DS22412IOM12A   ', Rev '0270', Slot B
 
Shelf expander example:
 

Expander phy state on 1a.33 (NETAPP  :DS224IOM12A      SHFGD0000000002):
                              Pwr         Invald Disprt Loss   Phy    CRC    Phy                    
                          Pwr Ccl Rsv Rls DWord  Error  Sync   Reset  Error  Change SATA            
PHY/BAY STATE             ON  Cnt Cnt Cnt Count  Count  Count  Prob   Cnt    Cnt    Affiliation     
------- ----------------- --- --- --- --- ------ ------ ------ ------ ------ ------ ----------------
 0/P0:0 12.0 Gb/s         --- --- --- --- 0      0      0      0      0      1      ----------------
 1/P0:1 12.0 Gb/s         --- --- --- --- 0      0      0      0      0      1      ----------------
 2/P0:2 12.0 Gb/s         --- --- --- --- 0      0      0      0      0      1      ----------------
 3/P0:3 12.0 Gb/s         --- --- --- --- 0      0      0      0      0      1      ----------------
 4/P1:0 Disabled         
 5/P1:1 Disabled         
 6/P1:2 Disabled         
 7/P1:3 Disabled         
 8/P2:0 12.0 Gb/s         --- --- --- --- 0      0      0      0      0      13     ----------------
 9/P2:1 12.0 Gb/s         --- --- --- --- 0      0      0      0      0      13     ----------------
10/P2:2 12.0 Gb/s         --- --- --- --- 0      0      0      0      0      13     ----------------
11/P2:3 12.0 Gb/s         --- --- --- --- 0      0      0      0      0      13     ----------------
12/P3:0 Disabled         
13/P3:1 Disabled         
14/P3:2 Disabled         
15/P3:3 Disabled         
16/0    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------
17/1    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------
18/2    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------
19/3    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------
20/4    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------
21/5    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------
22/6    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------
23/7    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------
24/8    6.0 Gb/s          YES 0   0   0   0      0      0      0      0      1      ----------------

 

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