Re: ASM and EMC PowerPath

  • From: "Radoulov, Dimitre" <cichomitiko@xxxxxxxxx>
  • To: goran bogdanovic <goran00@xxxxxxxxx>
  • Date: Wed, 20 Apr 2011 13:27:00 +0200


Thanks Goran,
yes, in your case querydisk -d reports the pseudo-device (emcpowerXn).
It seems that, at least with kernel 2.6, either path (emcpower or sd) could be used 
(see www.freelists.org/post/oracle-l/ASM-and-EMC-PowerPath,24).

Just curious,
did you configure ORACLEASM_SCANORDER in /etc/sysconfig/oracleasm?



Best regards
Dimitre


On 20/04/2011 13:17, goran bogdanovic wrote:



    querydisk -d returns the major/minor of one of the physical paths
    to the disk, not the emcpower path (I checked /proc/partitions for
    that),
    that's why I think it actually doesn't use the logical devices.
    I say "I think", because I'm not finding this anywhere in the docs
    for now.


in my case:

oracle@momos@+ASM: ~
-bash-3.2 $ oracleasm querydisk -p vol1
Disk "VOL1" is a valid ASM disk
/dev/emcpowera1: LABEL="VOL1" TYPE="oracleasm"
/dev/sdx1: LABEL="VOL1" TYPE="oracleasm"
/dev/sdm1: LABEL="VOL1" TYPE="oracleasm"
/dev/sdb1: LABEL="VOL1" TYPE="oracleasm"
/dev/sdai1: LABEL="VOL1" TYPE="oracleasm"
/dev/sdat1: LABEL="VOL1" TYPE="oracleasm"
/dev/sdbe1: LABEL="VOL1" TYPE="oracleasm"
/dev/sdbp1: LABEL="VOL1" TYPE="oracleasm"
/dev/sdca1: LABEL="VOL1" TYPE="oracleasm"

oracle@momos@+ASM: ~
-bash-3.2 $ oracleasm querydisk -d vol1
Disk "VOL1" is a valid ASM disk on device [120, 1]

-bash-3.2 $ cat /proc/partitions |grep '120'
 120    48  281018368 emcpowerd
 120    49  281016981 emcpowerd1
 120    64   41943040 emcpowere
 120    65   41943024 emcpowere1
 120     0  281018368 emcpowera
120     1  281001984 emcpowera1 <==
 120    16  281018368 emcpowerb
 120    17  281001984 emcpowerb1
 120    32  281018368 emcpowerc
 120    33  281001984 emcpowerc1
 120   144  281018368 emcpowerj
 120   145  281001984 emcpowerj1
 120   160  281018368 emcpowerk
 120   161  281001984 emcpowerk1
 120    80  281018368 emcpowerf
 120    81  281001984 emcpowerf1
 120   128  281018368 emcpoweri
 120   129  281001984 emcpoweri1
 120   112  281018368 emcpowerh
 120   113  281001984 emcpowerh1
 120    96  281018368 emcpowerg
 120    97  281001984 emcpowerg1

regards,
goran

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