FAQ
I have been trying to figure out how exadata griddisks are presented as candidate asm disks. We know that the disk discovery path for asm instances using exadata is "o/<cell_ip_address>*/<griddisk_name>*". I was wondering what actual path / udev in the operating system on the db machine does this translate to ?.

Search Discussions

  • Frits Hoogland at Feb 21, 2012 at 12:08 pm
    Content-Transfer-Encoding: quoted-printable
    Content-Type: text/plain;
    charset=us-ascii

    There is no udev/path translation on the database/computing layer in =
    exadata.

    During startup, ASM first needs to find the disks. It does that by =
    picking up the cellserver information (addresses) in =
    /etc/oracle/cell/network-config/cellip.ora
    Because the discovery string is set to "o/*/*", it picks up all =
    griddisks available on the cellservers defined in cellip.ora

    Because of the entirely different path, ASM knows it needs to =
    communicate over the network to get to the griddisks, instead of using a =
    locally attached disk. This combination is RDS (infiniband) on Exadata, =
    but can be UDP (ethernet).

    In fact, the discovery can manually be done by using kfod:
    kfod asm_diskstring=3D"o/*/*", disks=3Dall
    this is what the asmca uses behind the GUI to discover disks, also on =
    normal platforms.
    When specifying the o/*/* diskstring, kfod too reads =
    /etc/oracle/cell/network-config/cellip.ora to know where to look.


    Frits Hoogland

    http://fritshoogland.wordpress.com
    mailto:frits.hoogland@gmail.com
    cell: +31 6 53569942
    On Feb 21, 2012, at 10:32 AM, gaurav mehta wrote:

    I have been trying to figure out how exadata griddisks are presented =
    as candidate asm disks. We know that the disk discovery path for asm =
    instances using exadata is "o/<cell_ip_address>*/<griddisk_name>*". I =
    was wondering what actual path / udev in the operating system on the db =
    machine does this translate to ?. =20
  • Andy Colvin at Feb 21, 2012 at 1:48 pm
    Right�the ASM disks on Exadata do not exist on the database servers as physical devices. It's not like a typical system that uses block or raw devices for the ASM disks. They're connected using the iDB protocol over RDS or UDP.
    [enkdb01:root] /root
    fdisk -l
    Disk /dev/sda: 291.9 GB, 291999055872 bytes
    255 heads, 63 sectors/track, 35500 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot Start End Blocks Id System
    /dev/sda1 * 1 7832 62910508+ 83 Linux
    /dev/sda2 7833 9920 16771860 82 Linux swap / Solaris
    /dev/sda3 9921 35500 205471350 83 Linux

    [enkdb01:root] /root
    kfod disks=all
    --------------------------------------------------------------------------------
    Disk Size Path User Group
    ================================================================================
    1: 1501184 Mb o/192.168.12.3/DATA_CD_00_enkcel01 <unknown> <unknown>
    2: 1501184 Mb o/192.168.12.3/DATA_CD_01_enkcel01 <unknown> <unknown>
    3: 1501184 Mb o/192.168.12.3/DATA_CD_02_enkcel01 <unknown> <unknown>
    4: 1501184 Mb o/192.168.12.3/DATA_CD_03_enkcel01 <unknown> <unknown>
    5: 1501184 Mb o/192.168.12.3/DATA_CD_04_enkcel01 <unknown> <unknown>
    6: 1501184 Mb o/192.168.12.3/DATA_CD_05_enkcel01 <unknown> <unknown>
    7: 1501184 Mb o/192.168.12.3/DATA_CD_06_enkcel01 <unknown> <unknown>
    8: 1501184 Mb o/192.168.12.3/DATA_CD_07_enkcel01 <unknown> <unknown>
    9: 1501184 Mb o/192.168.12.3/DATA_CD_08_enkcel01 <unknown> <unknown>
    10: 1501184 Mb o/192.168.12.3/DATA_CD_09_enkcel01 <unknown> <unknown>
    11: 1501184 Mb o/192.168.12.3/DATA_CD_10_enkcel01 <unknown> <unknown>
    12: 1501184 Mb o/192.168.12.3/DATA_CD_11_enkcel01 <unknown> <unknown>
    13: 29808 Mb o/192.168.12.3/DBFS_DG_CD_02_enkcel01 <unknown> <unknown>
    14: 29808 Mb o/192.168.12.3/DBFS_DG_CD_03_enkcel01 <unknown> <unknown>
    15: 29808 Mb o/192.168.12.3/DBFS_DG_CD_04_enkcel01 <unknown> <unknown>
    16: 29808 Mb o/192.168.12.3/DBFS_DG_CD_05_enkcel01 <unknown> <unknown>
    17: 29808 Mb o/192.168.12.3/DBFS_DG_CD_06_enkcel01 <unknown> <unknown>
    18: 29808 Mb o/192.168.12.3/DBFS_DG_CD_07_enkcel01 <unknown> <unknown>
    19: 29808 Mb o/192.168.12.3/DBFS_DG_CD_08_enkcel01 <unknown> <unknown>
    20: 29808 Mb o/192.168.12.3/DBFS_DG_CD_09_enkcel01 <unknown> <unknown>
    21: 29808 Mb o/192.168.12.3/DBFS_DG_CD_10_enkcel01 <unknown> <unknown>
    22: 29808 Mb o/192.168.12.3/DBFS_DG_CD_11_enkcel01 <unknown> <unknown>
    23: 375344 Mb o/192.168.12.3/RECO_CD_00_enkcel01 <unknown> <unknown>
    24: 375344 Mb o/192.168.12.3/RECO_CD_01_enkcel01 <unknown> <unknown>
    25: 375344 Mb o/192.168.12.3/RECO_CD_02_enkcel01 <unknown> <unknown>
    26: 375344 Mb o/192.168.12.3/RECO_CD_03_enkcel01 <unknown> <unknown>
    27: 375344 Mb o/192.168.12.3/RECO_CD_04_enkcel01 <unknown> <unknown>
    28: 375344 Mb o/192.168.12.3/RECO_CD_05_enkcel01 <unknown> <unknown>
    29: 375344 Mb o/192.168.12.3/RECO_CD_06_enkcel01 <unknown> <unknown>
    30: 375344 Mb o/192.168.12.3/RECO_CD_07_enkcel01 <unknown> <unknown>
    31: 375344 Mb o/192.168.12.3/RECO_CD_08_enkcel01 <unknown> <unknown>
    32: 375344 Mb o/192.168.12.3/RECO_CD_09_enkcel01 <unknown> <unknown>
    33: 375344 Mb o/192.168.12.3/RECO_CD_10_enkcel01 <unknown> <unknown>
    34: 375344 Mb o/192.168.12.3/RECO_CD_11_enkcel01 <unknown> <unknown>
    35: 1501184 Mb o/192.168.12.4/DATA_CD_00_enkcel02 <unknown> <unknown>
    36: 1501184 Mb o/192.168.12.4/DATA_CD_01_enkcel02 <unknown> <unknown>
    37: 1501184 Mb o/192.168.12.4/DATA_CD_02_enkcel02 <unknown> <unknown>
    38: 1501184 Mb o/192.168.12.4/DATA_CD_03_enkcel02 <unknown> <unknown>
    39: 1501184 Mb o/192.168.12.4/DATA_CD_04_enkcel02 <unknown> <unknown>
    40: 1501184 Mb o/192.168.12.4/DATA_CD_05_enkcel02 <unknown> <unknown>
    41: 1501184 Mb o/192.168.12.4/DATA_CD_06_enkcel02 <unknown> <unknown>
    42: 1501184 Mb o/192.168.12.4/DATA_CD_07_enkcel02 <unknown> <unknown>
    43: 1501184 Mb o/192.168.12.4/DATA_CD_08_enkcel02 <unknown> <unknown>
    44: 1501184 Mb o/192.168.12.4/DATA_CD_09_enkcel02 <unknown> <unknown>
    45: 1501184 Mb o/192.168.12.4/DATA_CD_10_enkcel02 <unknown> <unknown>
    46: 1501184 Mb o/192.168.12.4/DATA_CD_11_enkcel02 <unknown> <unknown>
    47: 29808 Mb o/192.168.12.4/DBFS_DG_CD_02_enkcel02 <unknown> <unknown>
    48: 29808 Mb o/192.168.12.4/DBFS_DG_CD_03_enkcel02 <unknown> <unknown>
    49: 29808 Mb o/192.168.12.4/DBFS_DG_CD_04_enkcel02 <unknown> <unknown>
    50: 29808 Mb o/192.168.12.4/DBFS_DG_CD_05_enkcel02 <unknown> <unknown>
    51: 29808 Mb o/192.168.12.4/DBFS_DG_CD_06_enkcel02 <unknown> <unknown>
    52: 29808 Mb o/192.168.12.4/DBFS_DG_CD_07_enkcel02 <unknown> <unknown>
    53: 29808 Mb o/192.168.12.4/DBFS_DG_CD_08_enkcel02 <unknown> <unknown>
    54: 29808 Mb o/192.168.12.4/DBFS_DG_CD_09_enkcel02 <unknown> <unknown>
    55: 29808 Mb o/192.168.12.4/DBFS_DG_CD_10_enkcel02 <unknown> <unknown>
    56: 29808 Mb o/192.168.12.4/DBFS_DG_CD_11_enkcel02 <unknown> <unknown>
    57: 375344 Mb o/192.168.12.4/RECO_CD_00_enkcel02 <unknown> <unknown>
    58: 375344 Mb o/192.168.12.4/RECO_CD_01_enkcel02 <unknown> <unknown>
    59: 375344 Mb o/192.168.12.4/RECO_CD_02_enkcel02 <unknown> <unknown>
    60: 375344 Mb o/192.168.12.4/RECO_CD_03_enkcel02 <unknown> <unknown>
    61: 375344 Mb o/192.168.12.4/RECO_CD_04_enkcel02 <unknown> <unknown>
    62: 375344 Mb o/192.168.12.4/RECO_CD_05_enkcel02 <unknown> <unknown>
    63: 375344 Mb o/192.168.12.4/RECO_CD_06_enkcel02 <unknown> <unknown>
    64: 375344 Mb o/192.168.12.4/RECO_CD_07_enkcel02 <unknown> <unknown>
    65: 375344 Mb o/192.168.12.4/RECO_CD_08_enkcel02 <unknown> <unknown>
    66: 375344 Mb o/192.168.12.4/RECO_CD_09_enkcel02 <unknown> <unknown>
    67: 375344 Mb o/192.168.12.4/RECO_CD_10_enkcel02 <unknown> <unknown>
    68: 375344 Mb o/192.168.12.4/RECO_CD_11_enkcel02 <unknown> <unknown>
    69: 1501184 Mb o/192.168.12.5/DATA_CD_00_enkcel03 <unknown> <unknown>
    70: 1501184 Mb o/192.168.12.5/DATA_CD_01_enkcel03 <unknown> <unknown>
    71: 1501184 Mb o/192.168.12.5/DATA_CD_02_enkcel03 <unknown> <unknown>
    72: 1501184 Mb o/192.168.12.5/DATA_CD_03_enkcel03 <unknown> <unknown>
    73: 1501184 Mb o/192.168.12.5/DATA_CD_04_enkcel03 <unknown> <unknown>
    74: 1501184 Mb o/192.168.12.5/DATA_CD_05_enkcel03 <unknown> <unknown>
    75: 1501184 Mb o/192.168.12.5/DATA_CD_06_enkcel03 <unknown> <unknown>
    76: 1501184 Mb o/192.168.12.5/DATA_CD_07_enkcel03 <unknown> <unknown>
    77: 1501184 Mb o/192.168.12.5/DATA_CD_08_enkcel03 <unknown> <unknown>
    78: 1501184 Mb o/192.168.12.5/DATA_CD_09_enkcel03 <unknown> <unknown>
    79: 1501184 Mb o/192.168.12.5/DATA_CD_10_enkcel03 <unknown> <unknown>
    80: 1501184 Mb o/192.168.12.5/DATA_CD_11_enkcel03 <unknown> <unknown>
    81: 29808 Mb o/192.168.12.5/DBFS_DG_CD_02_enkcel03 <unknown> <unknown>
    82: 29808 Mb o/192.168.12.5/DBFS_DG_CD_03_enkcel03 <unknown> <unknown>
    83: 29808 Mb o/192.168.12.5/DBFS_DG_CD_04_enkcel03 <unknown> <unknown>
    84: 29808 Mb o/192.168.12.5/DBFS_DG_CD_05_enkcel03 <unknown> <unknown>
    85: 29808 Mb o/192.168.12.5/DBFS_DG_CD_06_enkcel03 <unknown> <unknown>
    86: 29808 Mb o/192.168.12.5/DBFS_DG_CD_07_enkcel03 <unknown> <unknown>
    87: 29808 Mb o/192.168.12.5/DBFS_DG_CD_08_enkcel03 <unknown> <unknown>
    88: 29808 Mb o/192.168.12.5/DBFS_DG_CD_09_enkcel03 <unknown> <unknown>
    89: 29808 Mb o/192.168.12.5/DBFS_DG_CD_10_enkcel03 <unknown> <unknown>
    90: 29808 Mb o/192.168.12.5/DBFS_DG_CD_11_enkcel03 <unknown> <unknown>
    91: 375344 Mb o/192.168.12.5/RECO_CD_00_enkcel03 <unknown> <unknown>
    92: 375344 Mb o/192.168.12.5/RECO_CD_01_enkcel03 <unknown> <unknown>
    93: 375344 Mb o/192.168.12.5/RECO_CD_02_enkcel03 <unknown> <unknown>
    94: 375344 Mb o/192.168.12.5/RECO_CD_03_enkcel03 <unknown> <unknown>
    95: 375344 Mb o/192.168.12.5/RECO_CD_04_enkcel03 <unknown> <unknown>
    96: 375344 Mb o/192.168.12.5/RECO_CD_05_enkcel03 <unknown> <unknown>
    97: 375344 Mb o/192.168.12.5/RECO_CD_06_enkcel03 <unknown> <unknown>
    98: 375344 Mb o/192.168.12.5/RECO_CD_07_enkcel03 <unknown> <unknown>
    99: 375344 Mb o/192.168.12.5/RECO_CD_08_enkcel03 <unknown> <unknown>
    100: 375344 Mb o/192.168.12.5/RECO_CD_09_enkcel03 <unknown> <unknown>
    101: 375344 Mb o/192.168.12.5/RECO_CD_10_enkcel03 <unknown> <unknown>
    102: 375344 Mb o/192.168.12.5/RECO_CD_11_enkcel03 <unknown> <unknown>
    --------------------------------------------------------------------------------
    ORACLE_SID ORACLE_HOME
    ================================================================================
    +ASM1 /u01/app/11.2.0.3/grid
    +ASM2 /u01/app/11.2.0.3/grid

    Andy Colvin

    Principal Consultant
    Enkitec
    andy.colvin@enkitec.com
    http://blog.oracle-ninja.com
    On Feb 21, 2012, at 6:07 AM, Frits Hoogland wrote:

    Content-Transfer-Encoding: quoted-printable
    Content-Type: text/plain;
    charset=us-ascii

    There is no udev/path translation on the database/computing layer in > exadata.

    During startup, ASM first needs to find the disks. It does that by > picking up the cellserver information (addresses) in > /etc/oracle/cell/network-config/cellip.ora
    Because the discovery string is set to "o/*/*", it picks up all > griddisks available on the cellservers defined in cellip.ora

    Because of the entirely different path, ASM knows it needs to > communicate over the network to get to the griddisks, instead of using a > locally attached disk. This combination is RDS (infiniband) on Exadata, > but can be UDP (ethernet).

    In fact, the discovery can manually be done by using kfod:
    kfod asm_diskstring="o/*/*", disks=all
    this is what the asmca uses behind the GUI to discover disks, also on > normal platforms.
    When specifying the o/*/* diskstring, kfod too reads > /etc/oracle/cell/network-config/cellip.ora to know where to look.


    Frits Hoogland

    http://fritshoogland.wordpress.com
    mailto:frits.hoogland@gmail.com
    cell: +31 6 53569942
    On Feb 21, 2012, at 10:32 AM, gaurav mehta wrote:

    I have been trying to figure out how exadata griddisks are presented > as candidate asm disks. We know that the disk discovery path for asm > instances using exadata is "o/<cell_ip_address>*/<griddisk_name>*". I > was wondering what actual path / udev in the operating system on the db > machine does this translate to ?.
    --
    http://www.freelists.org/webpage/oracle-l



    --
    http://www.freelists.org/webpage/oracle-l

    --
    http://www.freelists.org/webpage/oracle-l
  • Gaurav Mehta at Feb 22, 2012 at 5:46 pm
    Thanks.

    -----Original Message-----
    From: Andy Colvin
    Sent: Tuesday, February 21, 2012 7:16 PM
    To: frits.hoogland@gmail.com
    Cc: oracle-l
    Subject: Re: ASM disk path in exadata

    Right…the ASM disks on Exadata do not exist on the database servers as
    physical devices. It's not like a typical system that uses block or raw
    devices for the ASM disks. They're connected using the iDB protocol over
    RDS or UDP.
    [enkdb01:root] /root
    fdisk -l
    Disk /dev/sda: 291.9 GB, 291999055872 bytes
    255 heads, 63 sectors/track, 35500 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot Start End Blocks Id System
    /dev/sda1 * 1 7832 62910508+ 83 Linux
    /dev/sda2 7833 9920 16771860 82 Linux swap / Solaris
    /dev/sda3 9921 35500 205471350 83 Linux

    [enkdb01:root] /root
    kfod disks=all
    --------------------------------------------------------------------------------
    Disk Size Path User Group
    ================================================================================
    1: 1501184 Mb o/192.168.12.3/DATA_CD_00_enkcel01 <unknown>
    <unknown>
    2: 1501184 Mb o/192.168.12.3/DATA_CD_01_enkcel01 <unknown>
    <unknown>
    3: 1501184 Mb o/192.168.12.3/DATA_CD_02_enkcel01 <unknown>
    <unknown>
    4: 1501184 Mb o/192.168.12.3/DATA_CD_03_enkcel01 <unknown>
    <unknown>
    5: 1501184 Mb o/192.168.12.3/DATA_CD_04_enkcel01 <unknown>
    <unknown>
    6: 1501184 Mb o/192.168.12.3/DATA_CD_05_enkcel01 <unknown>
    <unknown>
    7: 1501184 Mb o/192.168.12.3/DATA_CD_06_enkcel01 <unknown>
    <unknown>
    8: 1501184 Mb o/192.168.12.3/DATA_CD_07_enkcel01 <unknown>
    <unknown>
    9: 1501184 Mb o/192.168.12.3/DATA_CD_08_enkcel01 <unknown>
    <unknown>
    10: 1501184 Mb o/192.168.12.3/DATA_CD_09_enkcel01 <unknown>
    <unknown>
    11: 1501184 Mb o/192.168.12.3/DATA_CD_10_enkcel01 <unknown>
    <unknown>
    12: 1501184 Mb o/192.168.12.3/DATA_CD_11_enkcel01 <unknown>
    <unknown>
    13: 29808 Mb o/192.168.12.3/DBFS_DG_CD_02_enkcel01 <unknown>
    <unknown>
    14: 29808 Mb o/192.168.12.3/DBFS_DG_CD_03_enkcel01 <unknown>
    <unknown>
    15: 29808 Mb o/192.168.12.3/DBFS_DG_CD_04_enkcel01 <unknown>
    <unknown>
    16: 29808 Mb o/192.168.12.3/DBFS_DG_CD_05_enkcel01 <unknown>
    <unknown>
    17: 29808 Mb o/192.168.12.3/DBFS_DG_CD_06_enkcel01 <unknown>
    <unknown>
    18: 29808 Mb o/192.168.12.3/DBFS_DG_CD_07_enkcel01 <unknown>
    <unknown>
    19: 29808 Mb o/192.168.12.3/DBFS_DG_CD_08_enkcel01 <unknown>
    <unknown>
    20: 29808 Mb o/192.168.12.3/DBFS_DG_CD_09_enkcel01 <unknown>
    <unknown>
    21: 29808 Mb o/192.168.12.3/DBFS_DG_CD_10_enkcel01 <unknown>
    <unknown>
    22: 29808 Mb o/192.168.12.3/DBFS_DG_CD_11_enkcel01 <unknown>
    <unknown>
    23: 375344 Mb o/192.168.12.3/RECO_CD_00_enkcel01 <unknown>
    <unknown>
    24: 375344 Mb o/192.168.12.3/RECO_CD_01_enkcel01 <unknown>
    <unknown>
    25: 375344 Mb o/192.168.12.3/RECO_CD_02_enkcel01 <unknown>
    <unknown>
    26: 375344 Mb o/192.168.12.3/RECO_CD_03_enkcel01 <unknown>
    <unknown>
    27: 375344 Mb o/192.168.12.3/RECO_CD_04_enkcel01 <unknown>
    <unknown>
    28: 375344 Mb o/192.168.12.3/RECO_CD_05_enkcel01 <unknown>
    <unknown>
    29: 375344 Mb o/192.168.12.3/RECO_CD_06_enkcel01 <unknown>
    <unknown>
    30: 375344 Mb o/192.168.12.3/RECO_CD_07_enkcel01 <unknown>
    <unknown>
    31: 375344 Mb o/192.168.12.3/RECO_CD_08_enkcel01 <unknown>
    <unknown>
    32: 375344 Mb o/192.168.12.3/RECO_CD_09_enkcel01 <unknown>
    <unknown>
    33: 375344 Mb o/192.168.12.3/RECO_CD_10_enkcel01 <unknown>
    <unknown>
    34: 375344 Mb o/192.168.12.3/RECO_CD_11_enkcel01 <unknown>
    <unknown>
    35: 1501184 Mb o/192.168.12.4/DATA_CD_00_enkcel02 <unknown>
    <unknown>
    36: 1501184 Mb o/192.168.12.4/DATA_CD_01_enkcel02 <unknown>
    <unknown>
    37: 1501184 Mb o/192.168.12.4/DATA_CD_02_enkcel02 <unknown>
    <unknown>
    38: 1501184 Mb o/192.168.12.4/DATA_CD_03_enkcel02 <unknown>
    <unknown>
    39: 1501184 Mb o/192.168.12.4/DATA_CD_04_enkcel02 <unknown>
    <unknown>
    40: 1501184 Mb o/192.168.12.4/DATA_CD_05_enkcel02 <unknown>
    <unknown>
    41: 1501184 Mb o/192.168.12.4/DATA_CD_06_enkcel02 <unknown>
    <unknown>
    42: 1501184 Mb o/192.168.12.4/DATA_CD_07_enkcel02 <unknown>
    <unknown>
    43: 1501184 Mb o/192.168.12.4/DATA_CD_08_enkcel02 <unknown>
    <unknown>
    44: 1501184 Mb o/192.168.12.4/DATA_CD_09_enkcel02 <unknown>
    <unknown>
    45: 1501184 Mb o/192.168.12.4/DATA_CD_10_enkcel02 <unknown>
    <unknown>
    46: 1501184 Mb o/192.168.12.4/DATA_CD_11_enkcel02 <unknown>
    <unknown>
    47: 29808 Mb o/192.168.12.4/DBFS_DG_CD_02_enkcel02 <unknown>
    <unknown>
    48: 29808 Mb o/192.168.12.4/DBFS_DG_CD_03_enkcel02 <unknown>
    <unknown>
    49: 29808 Mb o/192.168.12.4/DBFS_DG_CD_04_enkcel02 <unknown>
    <unknown>
    50: 29808 Mb o/192.168.12.4/DBFS_DG_CD_05_enkcel02 <unknown>
    <unknown>
    51: 29808 Mb o/192.168.12.4/DBFS_DG_CD_06_enkcel02 <unknown>
    <unknown>
    52: 29808 Mb o/192.168.12.4/DBFS_DG_CD_07_enkcel02 <unknown>
    <unknown>
    53: 29808 Mb o/192.168.12.4/DBFS_DG_CD_08_enkcel02 <unknown>
    <unknown>
    54: 29808 Mb o/192.168.12.4/DBFS_DG_CD_09_enkcel02 <unknown>
    <unknown>
    55: 29808 Mb o/192.168.12.4/DBFS_DG_CD_10_enkcel02 <unknown>
    <unknown>
    56: 29808 Mb o/192.168.12.4/DBFS_DG_CD_11_enkcel02 <unknown>
    <unknown>
    57: 375344 Mb o/192.168.12.4/RECO_CD_00_enkcel02 <unknown>
    <unknown>
    58: 375344 Mb o/192.168.12.4/RECO_CD_01_enkcel02 <unknown>
    <unknown>
    59: 375344 Mb o/192.168.12.4/RECO_CD_02_enkcel02 <unknown>
    <unknown>
    60: 375344 Mb o/192.168.12.4/RECO_CD_03_enkcel02 <unknown>
    <unknown>
    61: 375344 Mb o/192.168.12.4/RECO_CD_04_enkcel02 <unknown>
    <unknown>
    62: 375344 Mb o/192.168.12.4/RECO_CD_05_enkcel02 <unknown>
    <unknown>
    63: 375344 Mb o/192.168.12.4/RECO_CD_06_enkcel02 <unknown>
    <unknown>
    64: 375344 Mb o/192.168.12.4/RECO_CD_07_enkcel02 <unknown>
    <unknown>
    65: 375344 Mb o/192.168.12.4/RECO_CD_08_enkcel02 <unknown>
    <unknown>
    66: 375344 Mb o/192.168.12.4/RECO_CD_09_enkcel02 <unknown>
    <unknown>
    67: 375344 Mb o/192.168.12.4/RECO_CD_10_enkcel02 <unknown>
    <unknown>
    68: 375344 Mb o/192.168.12.4/RECO_CD_11_enkcel02 <unknown>
    <unknown>
    69: 1501184 Mb o/192.168.12.5/DATA_CD_00_enkcel03 <unknown>
    <unknown>
    70: 1501184 Mb o/192.168.12.5/DATA_CD_01_enkcel03 <unknown>
    <unknown>
    71: 1501184 Mb o/192.168.12.5/DATA_CD_02_enkcel03 <unknown>
    <unknown>
    72: 1501184 Mb o/192.168.12.5/DATA_CD_03_enkcel03 <unknown>
    <unknown>
    73: 1501184 Mb o/192.168.12.5/DATA_CD_04_enkcel03 <unknown>
    <unknown>
    74: 1501184 Mb o/192.168.12.5/DATA_CD_05_enkcel03 <unknown>
    <unknown>
    75: 1501184 Mb o/192.168.12.5/DATA_CD_06_enkcel03 <unknown>
    <unknown>
    76: 1501184 Mb o/192.168.12.5/DATA_CD_07_enkcel03 <unknown>
    <unknown>
    77: 1501184 Mb o/192.168.12.5/DATA_CD_08_enkcel03 <unknown>
    <unknown>
    78: 1501184 Mb o/192.168.12.5/DATA_CD_09_enkcel03 <unknown>
    <unknown>
    79: 1501184 Mb o/192.168.12.5/DATA_CD_10_enkcel03 <unknown>
    <unknown>
    80: 1501184 Mb o/192.168.12.5/DATA_CD_11_enkcel03 <unknown>
    <unknown>
    81: 29808 Mb o/192.168.12.5/DBFS_DG_CD_02_enkcel03 <unknown>
    <unknown>
    82: 29808 Mb o/192.168.12.5/DBFS_DG_CD_03_enkcel03 <unknown>
    <unknown>
    83: 29808 Mb o/192.168.12.5/DBFS_DG_CD_04_enkcel03 <unknown>
    <unknown>
    84: 29808 Mb o/192.168.12.5/DBFS_DG_CD_05_enkcel03 <unknown>
    <unknown>
    85: 29808 Mb o/192.168.12.5/DBFS_DG_CD_06_enkcel03 <unknown>
    <unknown>
    86: 29808 Mb o/192.168.12.5/DBFS_DG_CD_07_enkcel03 <unknown>
    <unknown>
    87: 29808 Mb o/192.168.12.5/DBFS_DG_CD_08_enkcel03 <unknown>
    <unknown>
    88: 29808 Mb o/192.168.12.5/DBFS_DG_CD_09_enkcel03 <unknown>
    <unknown>
    89: 29808 Mb o/192.168.12.5/DBFS_DG_CD_10_enkcel03 <unknown>
    <unknown>
    90: 29808 Mb o/192.168.12.5/DBFS_DG_CD_11_enkcel03 <unknown>
    <unknown>
    91: 375344 Mb o/192.168.12.5/RECO_CD_00_enkcel03 <unknown>
    <unknown>
    92: 375344 Mb o/192.168.12.5/RECO_CD_01_enkcel03 <unknown>
    <unknown>
    93: 375344 Mb o/192.168.12.5/RECO_CD_02_enkcel03 <unknown>
    <unknown>
    94: 375344 Mb o/192.168.12.5/RECO_CD_03_enkcel03 <unknown>
    <unknown>
    95: 375344 Mb o/192.168.12.5/RECO_CD_04_enkcel03 <unknown>
    <unknown>
    96: 375344 Mb o/192.168.12.5/RECO_CD_05_enkcel03 <unknown>
    <unknown>
    97: 375344 Mb o/192.168.12.5/RECO_CD_06_enkcel03 <unknown>
    <unknown>
    98: 375344 Mb o/192.168.12.5/RECO_CD_07_enkcel03 <unknown>
    <unknown>
    99: 375344 Mb o/192.168.12.5/RECO_CD_08_enkcel03 <unknown>
    <unknown>
    100: 375344 Mb o/192.168.12.5/RECO_CD_09_enkcel03 <unknown>
    <unknown>
    101: 375344 Mb o/192.168.12.5/RECO_CD_10_enkcel03 <unknown>
    <unknown>
    102: 375344 Mb o/192.168.12.5/RECO_CD_11_enkcel03 <unknown>
    <unknown>
    --------------------------------------------------------------------------------
    ORACLE_SID ORACLE_HOME
    ================================================================================
    +ASM1 /u01/app/11.2.0.3/grid
    +ASM2 /u01/app/11.2.0.3/grid

    Andy Colvin

    Principal Consultant
    Enkitec
    andy.colvin@enkitec.com
    http://blog.oracle-ninja.com
    On Feb 21, 2012, at 6:07 AM, Frits Hoogland wrote:

    Content-Transfer-Encoding: quoted-printable
    Content-Type: text/plain;
    charset=us-ascii

    There is no udev/path translation on the database/computing layer in >
    exadata.

    During startup, ASM first needs to find the disks. It does that by >
    picking up the cellserver information (addresses) in >
    /etc/oracle/cell/network-config/cellip.ora
    Because the discovery string is set to "o/*/*", it picks up all >
    griddisks available on the cellservers defined in cellip.ora

    Because of the entirely different path, ASM knows it needs to >
    communicate over the network to get to the griddisks, instead of using a >
    locally attached disk. This combination is RDS (infiniband) on Exadata, >
    but can be UDP (ethernet).

    In fact, the discovery can manually be done by using kfod:
    kfod asm_diskstring="o/*/*", disks=all
    this is what the asmca uses behind the GUI to discover disks, also on >
    normal platforms.
    When specifying the o/*/* diskstring, kfod too reads >
    /etc/oracle/cell/network-config/cellip.ora to know where to look.


    Frits Hoogland

    http://fritshoogland.wordpress.com
    mailto:frits.hoogland@gmail.com
    cell: +31 6 53569942
    On Feb 21, 2012, at 10:32 AM, gaurav mehta wrote:

    I have been trying to figure out how exadata griddisks are presented > as
    candidate asm disks. We know that the disk discovery path for asm >
    instances using exadata is "o/<cell_ip_address>*/<griddisk_name>*". I >
    was wondering what actual path / udev in the operating system on the db >
    machine does this translate to ?.
    --
    http://www.freelists.org/webpage/oracle-l



    --
    http://www.freelists.org/webpage/oracle-l

    --
    http://www.freelists.org/webpage/oracle-l


    --
    http://www.freelists.org/webpage/oracle-l

Related Discussions

Discussion Navigation
viewthread | post
Discussion Overview
grouporacle-l @
categoriesoracle
postedFeb 21, '12 at 9:38a
activeFeb 22, '12 at 5:46p
posts4
users3
websiteoracle.com

People

Translate

site design / logo © 2022 Grokbase