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Block devices by default while creating lv

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Operating Systems Linux Red Hat Block devices by default while creating lv
# 1  
Old 09-24-2014
Block devices by default while creating lv
Hello,

While creating lv in redhat linux is it that by default block devices would be created which is not the case with AIX I think where raw devices are created by default while creating lv.


I understand from block device that any storage disk is a block device and raw device is that which from a node does direct IO to a block device.I mean that suppose a disk is accessible to oracle and if on a node level that lv is a raw device then Oracle software doesn't use the os filesystem rather it directly does IO on disk however had the lv been a block device then Oracle S/w would have done IO through os filesystem and os cache.Please confirm if my understanding stands correct on this.


Best regards,
Vishal
# 2  
Old 09-24-2014
Hi,

Block and Raw devices are effectively the same thing and both will be created when a logical volume is created.

The difference is in how they are used, some applications can use both and the clue is usually in the application descriptors as an example "log" and "rawlog", and you are correct for the most part in your assumption about the OS intervention.

In order to clarify this properly I suspect you'll have to study the Oracle or appropriate application documentation - or the appropriate IBM or Linux documentation.

Regards

Dave
This User Gave Thanks to gull04 For This Post:
admin_db
# 3  
Old 11-24-2014
If there are few raw and few block devices in the os then how raw and block devices would be different from an os perspective?


Best regards,
Vishal
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