Powerpath on solaris 10 with missing pseudo device names.

Question

Hi all, I got a two node oracle rac cluster, running on solaris 10 with power path Version 5.2 SP 2 (build 12) Node2 got rebooted and 6 pseudo device names out of total 22 have been lost. So after reboot, I can still see 16 emcpower... devices, emcpower0a through emcpower15a. For the 6 in question, emcpower16 to emcpower21, I can see the LUN ID, device ID, path health etc by running 'powermt display device=all'. I obtained the pseudo device names that should be set for these 6 LUNs by comparing them against node1's pseudo devices. I tried several emcpadm commands, including exporting mappings from node1 to import them to node2 but none have worked so far. Is there a way to assign a pseudo name for a device visible to server? Thanks in advance. Here is a snipped from powermt display dev=all. You can see LUN 86 is missing pseudo device name. Pseudo name=emcpower15a CLARiiON ID=APM00093600135 [pre_prod] Logical device ID=600601602CC02000AE08CC1646A9DE11 [LUN 27] state=alive; policy=CLAROpt; priority=0; queued-IOs=0 Owner: default=SP B, current=SP B       Array failover mode: 1 ============================================================================== ---------------- Host ---------------   - Stor -   -- I/O Path -  -- Stats --- ###  HW Path                I/O Paths    Interf.   Mode    State  Q-IOs Errors ============================================================================== 3074 pci@7c0/pci@0/pci@8/SUNW,qlc@0/fp@0,0 c2t5006016044600698d27s0 SP A0     active  alive      0      0 3074 pci@7c0/pci@0/pci@8/SUNW,qlc@0/fp@0,0 c2t5006016944600698d27s0 SP B1     active  alive      0      0 3072 pci@7c0/pci@0/pci@9/SUNW,qlc@0/fp@0,0 c3t5006016144600698d27s0 SP A1     active  alive      0      0 3072 pci@7c0/pci@0/pci@9/SUNW,qlc@0/fp@0,0 c3t5006016844600698d27s0 SP B0     active  alive      0      0 CLARiiON ID=APM00093600135 [pre_prod] Logical device ID=600601602CC02000B23F84DF361DE111 [LUN 86] state=alive; policy=CLAROpt; priority=0; queued-IOs=0 Owner: default=SP B, current=SP B       Array failover mode: 1 ============================================================================== ---------------- Host ---------------   - Stor -   -- I/O Path -  -- Stats --- ###  HW Path                I/O Paths    Interf.   Mode    State  Q-IOs Errors ============================================================================== 3074 pci@7c0/pci@0/pci@8/SUNW,qlc@0/fp@0,0 c2t5006016044600698d0s0 SP A0     active  alive      0      0 3074 pci@7c0/pci@0/pci@8/SUNW,qlc@0/fp@0,0 c2t5006016944600698d0s0 SP B1     active  alive      0      0 3072 pci@7c0/pci@0/pci@9/SUNW,qlc@0/fp@0,0 c3t5006016144600698d0s0 SP A1     active  alive      0      0 3072 pci@7c0/pci@0/pci@9/SUNW,qlc@0/fp@0,0 c3t5006016844600698d0s0 SP B0     active  alive      0      0

mpk11 · Answer

Quick update as I am checking on this issue.

I can see the emcpower16 to emcpower21 devices when I run the "emcpadm print_mappings" command:

#emcpadm print_mappings | grep emcpower

Device: emcpower16a

Device: emcpower17a

Device: emcpower15a

Device: emcpower18a

Device: emcpower14a

Device: emcpower19a

Device: emcpower13a

Device: emcpower12a

Device: emcpower20a

Device: emcpower11a

Device: emcpower10a

Device: emcpower9a

Device: emcpower8a

Device: emcpower7a

Device: emcpower6a

Device: emcpower5a

Device: emcpower4a

Device: emcpower3a

Device: emcpower2a

Device: emcpower21a

Device: emcpower1a

Device: emcpower0a

Yet, like mentioned earlier, these device names are not available on the OS nor visible via powermt display dev=all.

mpk11 · Answer

OK, here I don't have a solution or root cause yet but "paulgroth'" post Re: Solaris - Powerpath new pseudo names disappear upon reboot, helped me recover the missing pseudo devices for now.

I did move/delete /kernel/drv/emcp.conf and /etc/powermt.custom.

Then "powermt config" and "powermt save".

daverush · Answer

mpk11,

Per https://support.emc.com/kb/85748, PowerPath 5.5 P02 patched this behavior. It's generally only seen on ZFS root filesystems.

If that's not a possiblity, you can disable powerstartup.

Rename pseudo devices or leave them as they are. To rename the PowerPath pseudo name refer to KB article 9330.
Run: svcadm disable powerstartup
Run powermt save and reboot.
Check the pseudo names if they are persistent.

Note: If the "powerstartup" service is enabled then the pseudos will be changed upon reboot.

PowerPath

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