Can I use file of udev rules for RAC on Oracle Enterprise Linux 6 11.2.0.3?

Version of the grid: 11.2.0.3
Platfomrm: The last Oracle Enterprise Linux 6 (Unbreakable Enterprise Kernel)


Yes guys Oracle sales have convinced our Manager to go OEL of AIX.
We plan to install RAC on Oracle Enterprise Linux 6 (UEK) 11.2.0.3.

I read this thread on the asmlib and udev rules file.
List of rules for CAR 10.2 udev

As a benefit to ASMLib, periera Levi said (quotes)
'+ A good async IO interface to the database, all the I/o interface is based on a model of performance + ASYNC'

Oracle is not out for 6 OEL or RHEL 6 AsmLib. I think that they will not release asmlib more.

So, we will use only the udev rules file. Without ASMLib, we will have an ASYNCHRONOUS i/o or other storage related issues?

Someone at - it successfully installed 11.2.0.3 RAC OEL 6 with udev rules file?

I use +/etc/udev/rules.d/40-multipath.rules+ udev file to configure the permissions of device of multiple devices on path to e/s for use by o/s user grid.

It is as follows:

# modded for setting mpath device permissions

SUBSYSTEM!="block", GOTO="end_mpath"

KERNEL!="dm-[0-9]*", GOTO="end_mpath"

PROGRAM!="/sbin/mpath_wait %M %m", GOTO="end_mpath"

ACTION=="add", RUN+="/sbin/dmsetup ls --target multipath --exec '/sbin/kpartx -a -p p' -j %M -m %m"

# goto labels added
PROGRAM=="/sbin/dmsetup ls --target multipath --exec /bin/basename -j %M -m %m", RESULT=="?*", NAME="%k", SYMLINK="mpath/%c", GOTO="check_cluster_devs"
PROGRAM!="/bin/bash -c '/sbin/dmsetup info -c --noheadings -j %M -m %m | /bin/grep -q .*:.*:.*:.*:.*:.*:.*:part[0-9]*-mpath-'", GOTO="check_cluster_devs"
PROGRAM=="/sbin/dmsetup ls --target linear --exec /bin/basename -j %M -m %m", NAME="%k", RESULT=="?*", SYMLINK="mpath/%c", GOTO="check_cluster_devs"

GOTO="end_mpath"

# set device permissions for Grid Infrastructure
LABEL="check_cluster_devs"
RESULT=="*", GROUP="oinstall", MODE="660"
RESULT=="*", OWNER="grid", GROUP="oinstall", MODE="660"
OPTIONS="last_rule"

LABEL="end_mpath"

# eof

I understand that it is no longer necessary that can be configured in +/etc/multipath.conf+ as follows:

..
multipaths {
    multipath {
        wwid  SSCST_BIOscst1_sdb_757d30d0
        alias scst1_sdb
        mode 0660
        uid oinstall
        gid grid
      }
.. etc.
}

However, has never work properly myself--must do something wrong that I saw a few sources Internet showing it works.

As far as I KNOW, it is also with OL6 (as it is with OL5 and earlier versions), not a question of AsmLib or udev/MPIO. Udev is a Mapper devices used by the kernel. The decision is whether to add another layer called AsmLib. Personally, I have yet to see any convincing evidence that why should I increase the complexity of the kernel driver stack, adding AsmLib. We also had a few serious incompatibility with AsmLib issues in the past (where he with, caused compatible I/O corruption at the logical level).

If you look at the clusters in the www.top500.org list, many of them have shared storage accessible via udev/multichemin Pentabytes and nothing else. MPIO has its roots as a driver of kernel for these groups. One of the reasons why we stopped years ago to use EMC Powerpath for our CARS that are wired to EMC San to shared storage.

Tags: Database

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