RE: SAN and Performance

1) How do determine what model SAN is needed?
https://www.ibm.com/storage/disk

2) Do all SANs offer the same performance?

3) How do you determine which attachment method should be used.
https://www-03.ibm.com/support/techdocs/atsmastr.nsf/5cb5ed706d254a8186256c71006d2e0a/fe962d4c9cefdcfc8625785600479c87/$FILE/iExternalStorageMatrix_v170301.pdf

3) The SAN can be direct attached without using VIOS, correct?

4) Strictly from a performance standpoint, can a SAN outperform internal SSD using the top PCIe3 RAID Adapter?

Our P7 8205-E6C is performing well with 100% SSD drives.
EOL was announced, so planning our next upgrade.
Power9 maybe a game changer.

Paul


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
Sent: Thursday, November 23, 2017 8:52 PM
To: Midrange Systems Technical Discussion; Gad Miron
Subject: Re: SAN and Performance

See Jim's response. The answer of course is "It Depends" but of course properly designed it will match or exceed internal disk performance.
Poorly designed, notsomuch.

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 11/22/2017 11:56 PM, Gad Miron wrote:

Hi Larry

Considering a new machine configuration...

Will SAN upgrade / degrade performance of Write-intensive applications ?
(Compared to 7TB internal disks?)

TIA
Gad

date: Wed, 22 Nov 2017 16:01:15 -0500
from: DrFranken <midrange@xxxxxxxxxxxx>
subject: Re: i hosting i question

Sure VIO can do that but SAN better choice.
You get things like easy tier to move hot data to SSD and cold data away.

You get flash copy for doing backups at a point in time that's not
stuck while you are doing the backups.

You can add drawers on the fly unlike internal disk. There are also
more disk options with SAN as well.

I do NOT hate internal disk, reliable and predictable for decades but
SAN disk brings options that internal doesn't.

18TB, I'd be on SAN for sure.


- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

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