2 Replies Latest reply: Oct 26, 2011 11:25 AM by Brion RSS

Hdisks in AIX5.3 bootlist

Roberto_de_la_Torre

Hello, consider this:

 

Pseudo name=hdiskpower1

Logical device ID=60060160DE5022001C6735F647BDE011 [LUN 315]

state=alive; policy=CLAROpt; priority=0; queued-IOs=0

Owner: default=SP B, current=SP A    Array failover mode: 1

==============================================================================

---------------- Host ---------------   - Stor -   -- I/O Path -  -- Stats ---

###  HW Path                I/O Paths    Interf.   Mode    State  Q-IOs Errors

==============================================================================

   1 fscsi1                    hdisk16   SP B1     active  alive      0      0

   3 fscsi3                    hdisk17   SP B0     active  alive      0      0

   0 fscsi0                    hdisk2    SP A0     active  alive      0      0

   2 fscsi2                    hdisk5    SP A1     active  alive      0      0

 

Pseudo name=hdiskpower0

Logical device ID=60060160DE502200D81B3AD647BDE011 [LUN 314]

state=alive; policy=CLAROpt; priority=0; queued-IOs=0

Owner: default=SP A, current=SP A    Array failover mode: 1

==============================================================================

---------------- Host ---------------   - Stor -   -- I/O Path -  -- Stats ---

###  HW Path                I/O Paths    Interf.   Mode    State  Q-IOs Errors

==============================================================================

   0 fscsi0                    hdisk0    SP A0     active  alive      0      0

   2 fscsi2                    hdisk1    SP A1     active  alive      0      0

   1 fscsi1                    hdisk3    SP B1     active  alive      0      0

   3 fscsi3                    hdisk6    SP B0     active  alive      0      0

 

bootlist_-m_normal_-o.txt

hdisk0 blv=hd5

hdisk16

 

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

 

Lun 314 and 315 are mirrored rootvg disks.....

 

So my question is, do I need to add ALL paths to AIX bootlist?, or which ones? and why? AIX team tells me I can only add 5, and i dont see anywhere in the bootlist documentation that specifies a number....

 

Any help would be appreciated!

  • 1. Re: Hdisks in AIX5.3 bootlist
    dd_emc

    If you are limited to 5 disks in the bootlist (sorry I don't know enough AIX to question this), then I would suggest something like LUN 314 by default sp (hdisk0), LUN 315 by default sp (hdisk16), LUN 314 by default sp but via an alternate fabric/hba (hdisk1), LUN 314 by non-default sp (hdisk3) then LUN 315 by non-default sp and via alternate fabric/hba (hdisk5). The idea is to add enough paths to protect against SP/switch and/or HBA failures.

     

    A couple of other points/questions:

    • LUN 315 is currently trespassed possibly because the server was logically booted from hdisk2 or hdisk5.
    • Are LUNs 314 & 315 raid protected on the CLARiiON? If they are, then why mirror at the host level?
    • Are they in different raid groups?
  • 2. Re: Hdisks in AIX5.3 bootlist
    Brion

    Hi.  This is failovermode 1.  With PP 5.3 SP1 and above for AIX, failover mode 4 should be used.

     

    There is the verbos –v option in bootlist which tells you have reached the maximum number of devices allowed is 5.