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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.
Hi LuisIt 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).
I fully agree. Our customers have no problems with AIX native MPIO booting from DellEMC or Hitachi (i.e. non-IBM) SAN storage (high-end models) via NPIV.Open IBM case and urge solution.Regards Igor.
------------------------------Luis Alberto Rojas Kramer------------------------------
it could be file system corruption There is documentation on how to do fsck in sms or maintenance mode.- in SMS boot do you see your disk on EMC.
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 Bratislav,This is a different issue. 554 on boot with Dell storage caused by a bug in the Dell storage system.But yes, would be good to get the exact model confirmed.Regards,Henrik Morsing
LuisHave a good day!The Dell/EMC claims that is not necessary PowerPath in to AIX/VIOS. The native driver AIXPCM must be enough.In the real life is not true.There is two reasons:1. Marketing - The Multipath driver for IBM Storage Systems is included now in the AIX/VIOS. The Dell/EMC multipath is PowerPath, but is very expensive. For this reason, they try to avoid it, because they are faceoff with Customers, that your real cost is higher that a solution with IBM Storage.2. Technical - You really need the PowerPath to avoid issues. Is no other way. Maybe works "sometimes" but is unstable solution.You can tune up the ODM and devices, but always is unstable solution. You will have a big problem with your Customer and the Dell/EMC fine (and tell to Customer with my products there is no issue:use Oracle Linux, OLVM etc...)Best 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 58ccf0984d201f37,0hdisk4 1 Enabled Non fscsi0 58ccf0904d201f37,0hdisk4 2 Enabled Sel,Opt fscsi1 58ccf0984d211f37,0hdisk4 3 Enabled Non fscsi1 58ccf0904d211f37,0Then set the boot list:# bootlist -m normal hdisk4 pathid=0,2,1,3Regards,Henrik Morsing
Thanks you Henrik and everyone who took some time to answer my note