AIX

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

Hi Luis

It may be best to open an AIX support case for this one if you have not already tried that avenue.  The solution to intermittent LED 554 issues can involve tweaks on switches or storage but will likely need in-depth investigation starting with AIX support. (I used to work in AIX support handling boot and storage device driver issues).

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

------------------------------
Luis Alberto Rojas Kramer
------------------------------

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

Hello,

I don't know which EMC storage we are talking about.
I had a problem with EMC storage, it did not see LUNs on AIX via mpio, so I had to install EMC PowerPath.
Best to check with EMC.
It might be best to create an SSP.

Regards,

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards 

Forgot to mention, booting (after hotfix) is more reliable if you set the boot paths to be the preferred paths from lsmpio.

So 'lsmpio -l hdisk4':

hdisk4   0        Enabled  Sel,Opt      fscsi0  58ccf0984d201f37,0
hdisk4   1        Enabled  Non          fscsi0  58ccf0904d201f37,0
hdisk4   2        Enabled  Sel,Opt      fscsi1  58ccf0984d211f37,0
hdisk4   3        Enabled  Non          fscsi1  58ccf0904d211f37,0

Then set the boot list:

# bootlist -m normal hdisk4 pathid=0,2,1,3

Regards,
Henrik Morsing

Hi experts.. 

We have an issue here at AIX booting time with EMC (Dell) SAN Storage System due path lost.
After seeing Kernel Starting message, suddenly stops at 554 LED code because booting process can't find the path from it had been accessing the IPL disk.

EMC told us we should reduce to just one path only from Storage to Server to avoid  use other path which the Storage System is not offer the active path to these boot disk. 
But doing that, is a problem and represent a task which takes SysAdmin time and could incur in risks by human errors every time an LPAR needs to be booted; like unmap virtual FibreChannel adapters or unconfigure SAN Switches zoning or delete WWPN from the host attachment config at Storage System.

Does somebody know how to avoid this problem happen? 
We thought that maybe a vscsi disk from VIOS to LPARs could help, but, I can't believe every customer with EMC Systems should live with that problem. 

Regards