Lun Concept

[Mridul Dutta]

HI friend ,

I need some material regarding Lun concept . If some body have pls send to me

Thanks and regards

Mridul

[Sivakumar TS]

Hi Mridul,

Check this doc,

http://www.qlogic.com/documents/datasheets/knowledge_data/whitepapers/whitepaper.lunmasking.pdf

HtH,

Siva.

[Devender Khatana · Accepted solution]

Hi,

LUN as the name itself describes stands for logical unit number and in fact is a logical unit being created out of one or more physical units.

Normally you should have some raid supporting hardware which can divide your physical disks into one or more LUNs and you hosts considers these LUNs itself as disk devices All the I/O host do is equally distributed to the physical devices by the RAID hardware. The advantage of this will be that the distribution overhead is not added to the CPU of your hosts and is handled by the RAID hardware and other benefit will be that the raid provides single/more disk media failure redundancy.

HTH,
Devender

[Arunvijai_4]

Hi Mridul,

LUN (Logical Unit Number) Masking is an authorization process that makes a LUN available to some hosts and unavailable to other hosts.

LUN Masking is implemented primarily at the HBA (Host Bus Adapater) level. LUN Masking implemented at this level is vulnerable to any attack that compromises the HBA.

Some storage controllers also support LUN Masking.

LUN Masking is important because Windows based servers attempt to write volume labels to all available LUN's. This can render the LUN's unusable by other operating systems and can result in data loss.

-Arun

[Arunvijai_4]

Hi Mridul,

Here is a great tutorial.

http://biology.ncsa.uiuc.edu/library/SGI_bookshelves/SGI_Admin/books/IA_DiskFiles/sgi_html/ch01.html

-Arun