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RAW DEVICES Vs BLOCK DEVICES IN ASM

JhilAug 2 2017 — edited Aug 2 2017

Hi,

>> I am starting from basics

To Provide ASM disk , we can use RAW DISKS or BLOCK DISKS.

>> Is this right ?

If we go for RAW DEVICES, we need to bound RAW DEVICES with BLOCK DEVICES  via a Process called binding.

e.g  # raw /dev/raw/raw1  /dev/sdb1

If we go for block devices , do we need to use ASMLIB  SW ?

# ls -l /dev/sdb*

brw-r----- 1 root disk 8, 16 Jul 31 03:10 /dev/sdb

brw-r----- 1 root disk 8, 17 Jul 31 03:17 /dev/sdb1

[root@CATALOG ~]# ls -l /dev/sdc*

brw-r----- 1 root disk 8, 32 Jul 31 03:12 /dev/sdc

brw-r----- 1 root disk 8, 33 Jul 31 03:17 /dev/sdc1

[root@CATALOG ~]# ls -l /dev/sde*

brw-r----- 1 root disk 8, 64 Jul 31 03:16 /dev/sde

brw-r----- 1 root disk 8, 65 Jul 31 03:17 /dev/sde1

[root@CATALOG ~]# ls -l /dev/sdd*

brw-r----- 1 root disk 8, 48 Jul 31 03:14 /dev/sdd

brw-r----- 1 root disk 8, 49 Jul 31 03:17 /dev/sdd1

>> My questions

1) I want to know how block devices and  Raw devices are useful to provide ASM disks ?

2) Simply Block devices Vs Raw devices in ASM -

3) How they are behaving different with each other in ASM storage ?

Thanks a lot

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