Using the blkid Command getting UUID information disks

When failure of "scsi_id" command during ASM installation with udev rules, you can use "blkid" command to get UUID information of disks.

~]# blkid
/dev/vda1: UUID="7fa9c421-0054-4555-b0ca-b470a97a3d84" TYPE="ext4"
/dev/vda2: UUID="7IvYzk-TnnK-oPjf-ipdD-cofz-DXaJ-gPdgBW" TYPE="LVM2_member"
/dev/mapper/vg_kvm-lv_root: UUID="a07b967c-71a0-4925-ab02-aebcad2ae824" TYPE="ext4"
/dev/mapper/vg_kvm-lv_swap: UUID="d7ef54ca-9c41-4de4-ac1b-4193b0c1ddb6" TYPE="swap"

For instance, to display information about /dev/vda1, type:

~]# blkid /dev/vda1
/dev/vda1: UUID="7fa9c421-0054-4555-b0ca-b470a97a3d84" TYPE="ext4"

You can also use the above command with the -p and -o udev command line options to obtain more detailed information. Note that root privileges are required to run this command:

blkid -po udev device_name

For example:

~]# blkid -po udev /dev/vda1
ID_FS_UUID=7fa9c421-0054-4555-b0ca-b470a97a3d84
ID_FS_UUID_ENC=7fa9c421-0054-4555-b0ca-b470a97a3d84
ID_FS_VERSION=1.0
ID_FS_TYPE=ext4
ID_FS_USAGE=filesystem

Can SCAN IP be used for ftp of files ?

SCAN IP's can be used for ftp ,sftp and also ssh connection during rac cluster service already running . Because when cluster services are running scan ip's nic bonding to public network interface for example ;

In RAC Node1

oracle@testdbrac1:/oracle:>ifconfig -a

eth0      Link encap:Ethernet  HWaddr 00:50:56:B8:40:B0 

          inet addr:PUBLIC IP  Bcast:xxx.x.x.xxx  Mask:255.255.255.0

          inet6 addr: fe80::250:56ff:feb8:40b0/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1006522 errors:0 dropped:0 overruns:0 frame:0

          TX packets:92530 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:99913091 (95.2 MiB)  TX bytes:32001574 (30.5 MiB)

eth0:2    Link encap:Ethernet  HWaddr 00:50:56:B8:40:B0 

          inet addr:SCAN IP_1  Bcast:xxx.x.x.xxx  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

In RAC Node 2

oracle@testdbrac2:/oracle:>ifconfig -a

eth0      Link encap:Ethernet  HWaddr 00:50:56:B8:40:B1 

          inet addr:PUBLIC IP  Bcast:xxx.x.x.xxx  Mask:255.255.255.0

          inet6 addr: fe80::250:56ff:feb8:40b1/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1004162 errors:0 dropped:0 overruns:0 frame:0

          TX packets:69260 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:100817580 (96.1 MiB)  TX bytes:15328431 (14.6 MiB)

eth0:2    Link encap:Ethernet  HWaddr 00:50:56:B8:40:B1 

          inet addr:SCAN IP_2  Bcast:xxx.x.x.xxx  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

eth0:3    Link encap:Ethernet  HWaddr 00:50:56:B8:40:B1 

          inet addr:SCAN IP_3  Bcast: xxx.x.x.xxx  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

You can also check output command "ifconfig -a"  when rac services are not running. If you are planning for failover scenarios , it is reasonably.