Amir - You missed what Mladen and Tim are pointing out. /dev/<whatever>/dm-50 is a block device. What Mladen refers to as "scusify", Tim shows with the output: udev_rules_get_name: add symlink 'disk/by-path/pci-0000:00:0d.0-scsi-1:0:0:0-*part1*' Partition the disk using parted or (deprecated) fdisk. You can make the name available either through udev rules or via friendly names in the multipath.conf file. By the way - welcome back Mladen. On Fri, Jan 16, 2015 at 2:13 PM, Hameed, Amir <Amir.Hameed@xxxxxxxxx> wrote: > Thanks Mladen. > > I am following Red Hat's note https://access.redhat.com/solutions/272153 > titled "How to create Oracle ASM disks using DM Multipath devices in Red > Hat Enterprise Linux?" to define UDEV rules on block devices. What Tim has > documented uses SCSI device names in the rule instead of Device Mapper. > This is the first time I am doing ASM. I am going to carry on with the > installation to see how it goes and it might be an issue with CVU. This is > what is listed in Red Hat's document. > > > > 1. udevadm info --query=all --name=/dev/mapper/mpathN |grep -i DM_UUID > > > > 1. ACTION=="add|change", ENV{DM_UUID}=="mpath-<UUID>", > SYMLINK+="oracleasm/asm01", GROUP="dba", OWNER="oracle", MODE="0660" > > > > *From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto: > oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *Mladen Gogala > *Sent:* Friday, January 16, 2015 2:47 PM > *To:* oracle-l@xxxxxxxxxxxxx > *Subject:* Re: CVU reporting error when checking for ASM storage > > > > Amir, you cannot just add Linux block devices to ASM. You need to "scsify" > them. The best brief description is on Tim Hall's ORACLE-BASE site: > > > http://oracle-base.com/articles/linux/udev-scsi-rules-configuration-in-oracle-linux-5-and-6.php > > > > On 01/16/2015 02:00 PM, Hameed, Amir wrote: > > Hi, > > I am installing Oracle Grid 12.1.0.2 on RHEL 6.5. When the Prerequisite > Checks phase of OUI, it reported PRVF -5150 on ASM disks. When run CVU on > the ASM disks, it reports an error as shown below. Below is an out from CVU > with debugging enabled when it was run for one RAC node only: > > CV_TRACELOC=/tmp/cvutrace > > ./runcluvfy.sh comp ssa -n <node-name> -s /dev/oracleasm/grid/asmgrid02 > > ============================================== > > Verifying shared storage accessibility > > > > Checking shared storage accessibility... > > > > ERROR: /dev/oracleasm/grid/asmgrid02 > > Storage operation failed > > > > > > Shared storage check failed on nodes "usa0300lx566" > > > > Verification of shared storage accessibility was unsuccessful on all the > specified nodes. > > ============================================== > > > > The CVU trace file shows the following error: > > > OUTPUT><CV_ERR><SLOS_LOC>CVU00101</SLOS_LOC><SLOS_OP></SLOS_OP><SLOS_CAT>OTHEROS</SLOS_CAT><SLOS_OTHERINFO>*Cannot > locate disk for > '/dev/dm-50*'</SLOS_OTHERINFO></CV_ERR><CV_VRES>0</CV_VRES><CV_LOG>Exectask:getstorage > success.</CV_LOG><CV_CMDLOG><CV_INITCMD>/tmp/CVU_12.1.0.2.0_oracle/exectask > -getstorage */dev/oracleasm/grid/asmgrid02* </CV_INITCMD><CV_CMD>*realpath > /dev/oracleasm/grid/asmgrid02*</CV_CMD><CV_CMDOUT> > /dev/dm-50</CV_CMDOUT><CV_CMDSTAT>0</CV_CMDSTAT><CV_CMD>stat > /dev/dm-50</CV_CMD><CV_CMDOUT> > stat.st_mode:61B0</CV_CMDOUT><CV_CMDSTAT>0</CV_CMDSTAT><CV_CMD>fopen > /proc/partitions</CV_CMD><CV_CMDOUT> 8 0 291991552 sda > > > > I am using udev rules and the rule defined is shown below: > > ACTION=="add|change", > ENV{DM_UUID}=="mpath-360000970000192606068533031464134", > SYMLINK+="oracleasm/grid/asmgrid02", GROUP="asmadmin", OWNER="oracle", > MODE="0660" > > > > The Device alias exists as shown below: > > $ ls -ltr /dev/oracleasm/grid/asmgrid02 > > > > The multipath device has proper permissions set: > > cd /dev/oracleasm/grid > > $ ls -ltr > > total 0 > > lrwxrwxrwx 1 root root 11 Jan 16 13:37 asmgrid02 -> ../../dm-50 > > > > $ ls -ltr ../../dm-50 > > brw-rw---- 1 *oracle asmadmin* 253, 50 Jan 16 13:37 ../../dm-50 > > > > Any idea what might be wrong here? > > > > Thanks, > > Amir > > > > > -- > > Mladen Gogala > > Oracle DBA > > http://mgogala.freehostia.com > >