Direct attached Disk and SAN Disk on the server

[Shivkumar]

Dear Sirs,

Is any application depends on direct attached disk or SAN disk on the hpux server ?

I mean are there any applications which works only on direct disk and not on SAN disks configured to a server ?

Thanks,
Shiv

[Sanjay_6 · Accepted solution]

Hi,

I do not think the applciation can differentiate if the storage is direct attached or through SAN.

So the anwer would be that the application probably doesn't care.

Hope this helps.

regds

[Raj D.]

Shiv,

Irrespective of your type of disk or storage attached , Application will function normally, you may experience i/o trafic depending on your attached storage , but application will work normally, either its direct disk or SAN disk.

You can check this link for details of , DAS, NAS , and SAN.

hth,
Raj.

[Raj D.]

Shiv,

Irrespective of your type of disk or storage attached , Application will function normally, you may experience i/o trafic depending on your attached storage , but application will work normally, either its direct disk or SAN disk.

You can check this link for details of , DAS, NAS , and SAN.

http://www.storagesearch.com/xtore-art1.html

hth,
Raj.

[Arunvijai_4]

Hi Shiv,

Applications running on HP-UX don't care whether the system is connected to SAN or not. As far as i know, there are *NO* application which won't work on SAN env. SAN is Storage Area Network where Data is transfered as Blocks and it uses Fibre channel and IP protocols.

-Arun

[Devender Khatana]

Hi Shiv,

For application it is a storage apce accessible by any means. Application is not limited to the type of space wheaether it is FW SCSI, UW SCSI, SAN or NAS.

But when performance and reliability comes into picture, SAN will have the upper hand in both performance as well as reliability.

The performance and reliability will be better as the redudancy is taken care at hardware level, and the CPU overhead is not added because of mirroring etc.

HTH,
Devender

[Steven E. Protter]

Shiv,

My experience has shown disk is disk. If it shows up on ioscan and pvcreate works, the systems does not care or know whether its direct attached or not.

I have seen some situations where direct attach provides better performance than being on a crowded, busy fiber switch, but it was hard to prove and not significant enough to change network design.

SEP

[Shameer.V.A]

Hi Shiv,
I also agree with SEP, If your box is detecting the disk in ioscan, then it is just like a local disk.
Only performance will be the factor. If your storage box is using RAID 0 or RAID 1+0 ( Depends on the configuration of your Storage array), then you may be getting more I/O throughput than a local disk, because of parallel Read/Write activity . But still it will be depends on how many servers are connected & accessing your SAN.

Shameer

[Yogeeraj_1]

hi,

Applications know only the logical part of them in the form of file system names under which they have been mounted or the "raw device" file names that are names that have been assigned by the Operating system based on a specific algorithm...

hope this helps too!

kind regards
yogeeraj

[David Bellamy]

Hello Shiv :
We are using an XP1024 with on half of the CHIPs direct connected to our systems and the other half connected via McData Switch. So as long as the disk show up in an ioscan the apps doesn't care if it direct connect or not.

[Mahesh Kumar Malik]

Hi Shiv

So far we have not come accross an application which dependent on disk connectivity option.

Regards
Mahesh