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Oceanstor S2600T Controlle mini sas port isolated by frequent sas link up/down events

Publication Date:  2014-12-25 Views:  74 Downloads:  0
Issue Description
Oceanstor S2600T Controlle mini sas port isolated by frequent sas link up/down events. All disks in Disk enclosure 2 were in single link state. After repair link connection, the port still didn't work.
Handling Process
Reviewed events log, and found many events of sas port links down and links up:

2014-10-26 12:25:58    0xe02020001    Major    2014-10-26 12:26:05    The SAS expansion port (disk enclosure 2, SAS controller A, port PRI) links down.    Step 1 Check whether the expansion cable is removed or damaged.
2014-10-26 12:25:59    0xe02020001    Major    2014-10-26 12:26:05    The SAS expansion port (controller enclosure 0, SAS management module A, port EXP0) links down.


Reviewer SES log, found exp0 of controller A was disabled:

[4e7d][14.10.27.03:40.15] [0x6b9832b1] phy:22, phymon******disable exp phy [4e7e][14.10.27.03:40.15] [0x6b9832b1] phy:22, phymon******state 'ERR DISABLED'
[4e87][14.10.27.03:40.15] [0x6b984643] phy:23, phymon******disable exp phy [4e88][14.10.27.03:40.15] [0x6b984644] phy:23, phymon******state 'ERR DISABLED'
[4e8e][14.10.27.03:40.15] [0x6b9855e8] phy:20, phymon******disable exp phy [4e8f][14.10.27.03:40.15] [0x6b9855e8] phy:20, phymon******state 'ERR DISABLED'
[4e92][14.10.27.03:40.15] [0x6b9855e8] phy:21, phymon******disable exp phy [4e93][14.10.27.03:40.15] [0x6b9855e8] phy:21, phymon******state 'ERR DISABLED'


Enter storage with developer mode, check state of all sas ports', and found exp0 of controller A was off,

developer: admin:/>showportswitch
===========================================================================
                                          Port PHY Information
---------------------------------------------------------------------------------------------------------
  Controller    Encloure ID    Module Type         Module ID    Port ID    PHY0    PHY1    PHY2    PHY3
---------------------------------------------------------------------------------------------------------
  A             0              Controller          0            EXP0       OFF      OFF      OFF      OFF
  A             0              Controller          0            EXP1       ON      ON      ON      ON
  A             1              Expansion Module    0            PRI        ON      ON      ON      ON


Enable the port manually:

developer: admin:/>chgportswitch -c a -e 0 -mt 1 -module 0 -p EXP0 -sw on
Are you sure to change the switch of this port?(y/n)
y
command operates successfully.

developer: admin:/>showportswitch
=============================================================================
                                          Port PHY Information
---------------------------------------------------------------------------------------------------------
  Controller    Encloure ID    Module Type         Module ID    Port ID    PHY0    PHY1    PHY2    PHY3
---------------------------------------------------------------------------------------------------------
  A             0              Controller          0            EXP0       ON      ON      ON      ON
  A             0              Controller          0            EXP1       ON      ON      ON      ON
  A             1              Expansion Module    0            PRI        ON      ON      ON      ON
  A             1              Expansion Module    0            EXP        ON      ON      ON      ON

After above actions, port enabled and link recovered automatically.
Root Cause
Oceanstor S2600T Controlle mini sas port would be isolated if the link has frequent sas link up/down events.

END