Re: Powerpath and ASM w/o ASMLib

The udev piece seems to be what's missing. I usually use multipath with the device name in multipath.conf. On this setup however, multipath is not an active service and multipath.conf does not exist. The wwid and or scsi device do not show up in /dev/disk/by-id:

*[root_at_685925-db6 by-id]# ls -al |grep 60060160E6914D00ADF8F35D73CD831D[root_at_685925-db6 by-id]#*

The LUNs SHOULD show up in /dev/ora in accordance with the stanza in */etc/udev/rules.d/99-oracle-grid.rules* - but alas, they do not.

The asm_diskstring is set to:

*SQL> show parameter asm_diskstringNAME

TYPE        VALUE------------------------------------ -----------
------------------------------asm_diskstring                       string

> Are the new devices created by udev?
> Did you set ASM_DISKTRING (
> https://docs.oracle.com/en/database/oracle/oracle-database/12.2/refrn/ASM_DISKSTRING.html)
> to search that location?
>
> Harel
>
> On Thu, Jan 2, 2020 at 9:35 PM David Barbour <david.barbour1_at_gmail.com>
> wrote:
>
>> Happy New Year!
>>
>> We are changing SANs from an EMC VNX to an EMC UNITY. The servers and
>> SANs are hosted at a third-party site. We are on RHEL 6.8. We are not
>> using ASMLib.
>>
>> When I was informed that the LUNs had been presented to the servers (it's
>> a 2-node RAC) I re-scanned the hosts and the Powerpath devices showed up.
>> Using parted I partitioned each LUN as a full primary partition. I added
>> the WWID to udev rules, but no matter what I try, the LUNs are not showing
>> up in the ASM search path. Generally I don't use Powerpath, so I'm hoping
>> I don't have to reboot the server to get these to show up.
>>
>> *Here's what I see (using one LUN as an example):*
>>
>>
>>
>> *[root_at_685925-db6 dev]# ls -al |grep emcpowereebrw-rw---- 1 root disk
>> 120, 2144 Jan 2 12:32 emcpowereebrw-rw---- 1 root disk 120, 2145
>> Jan 2 12:08 emcpoweree1*
>>
>>
>> *[root_at_685925-db6 dev]# parted /dev/emcpoweree*
>>
>>
>>
>>
>>
>> *Disk /dev/emcpoweree: 859GBSector size (logical/physical):
>> 512B/512BPartition Table: msdosNumber Start End Size Type File
>> system Flags 1 4194kB 859GB 859GB primary*
>>
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>> *[root_at_685925-db6 dev]# powermt display dev=emcpowereePseudo
>> name=emcpowereeUnity ID=APM00193839645 [Host_5]Logical device
>> ID=60060160E6914D00ADF8F35D73CD831D
>> [863648-685926-800GB-Pool1-RAC_Cluster-56]state=alive; policy=CLAROpt;
>> queued-IOs=0Owner: default=SP A, current=SP A Array failover mode:
>> 4==============================================================================---------------
>> Host --------------- - Stor - -- I/O Path -- -- Stats ---### HW Path
>> I/O Paths Interf. Mode State Q-IOs
>> Errors==============================================================================
>> 1 bfa sdtq SP B3 active alive 0
>> 0 1 bfa sdrj SP A2 active alive 0
>> 0 2 bfa sdpc SP A3 active alive 0
>> 0 2 bfa sdmv SP B2 active alive
>> 0 0*
>>
>>
>>
>> *[root_at_685925-db6 by-id]# ls -al |grep
>> 60060160E6914D00ADF8F35D73CD831D[root_at_685925-db6 by-id]#*
>>
>> *Here's the stanza in /udev/rules.d/99-oracle-grid.rules:*
>>
>>
>>
>> *#emcpoweree#[863648-685926-800GB-Pool1-RAC_Cluster-56] ACTION=="add|change",
>> KERNEL=="emcpower[a-z][a-z]?", SUBSYSTEM=="block", PROGRAM="/sbin/scsi_id
>> --whitelisted --replace-whitespace /dev/$parent",
>> RESULT=="360060160E6914D00ADF8F35D73CD831D", OWNER="grid",
>> GROUP="asmadmin", MODE="0660", NAME="/dev/ora/ORA-ACTIVE101p%n"*
>>
>> I've tried rescanning the host(s), /sbin/udevadm control --reload-rules
>> with /sbin/udevadm trigger --type=devices --action=change and powermt save
>> and powermt config.
>>
>> Nothing.
>>
>> Do I need to reboot or is there some way to get these to show up?
>>
>> *David A. Barbour*
>>
>> *dbarbour_at_istation.com <dbarbour_at_istation.com>*
>>
>> *(214) 292-4096*
>>
>> Istation
>>
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>>
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>>
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>>
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