RE: Can the new feature ES0S 775 GB 4k SSD drives be used in a 5887 EXP24S in P7-8205-E6C?

Larry,

I read with P8 you can now mix, but not recommended, as Sue previously stated.
I like all the new IO options, we now have 6 types of disks, 10k, 15k, 15k 4k, SSD, SSD 4k, in addition to the various sizes.
But in reality, you need to pick 1, and only 1, per LPAR/ DASD controller.

https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM%20i%20Technology%20Updates/page/IBM%20i%20IO%20Support%20Summary

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
Sent: Monday, January 12, 2015 12:44 PM
To: Midrange Systems Technical Discussion
Subject: Re: Can the new feature ES0S 775 GB 4k SSD drives be used in a 5887 EXP24S in P7-8205-E6C?

I found a document from IBM that indicated NO expected performance increase with 4K Drives. Not what I would expect BUT that's their statement.

The same document warns AGAINST mixing 4K and 5xx sector size drives on the same RAID cards. This CAN WORK but is expected to cause confusion.
RIAD SETS cannot mix 5xx and 4K Drives so that's where you'd get in trouble in theory.

- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 1/7/2015 4:30 PM, Steinmetz, Paul wrote:

Larry,

How much performance improvement between the 2 different 775 SSD?
Would this be a another valid reason to try and cost justify a P7 to P8 upgrade, in addition to the other performance and maintenance savings?

Paul


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
DrFranken
Sent: Wednesday, January 07, 2015 3:30 PM
To: Midrange Systems Technical Discussion
Subject: Re: Can the new feature ES0S 775 GB 4k SSD drives be used in a 5887 EXP24S in P7-8205-E6C?

IBM Say the ES0S drives are Power8 only.

As for the difference instead of 512(520) byte 'sectors' (we know they are really not sectors on SSD) instead the new ones use 4K Blocks. In theory this will be better for performance most of the time because there are fewer I/Os done (1 to 8). Practically it means that more disk storage can be addressed with the name number of blocks.

I seem to recall that IBM i moved from 512 to 4K (or was it 2K?) blocks back in the CISC to RISC days So logically this should be a smart move for IBM i to move to 4K block storage.

- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 1/7/2015 2:32 PM, Steinmetz, Paul wrote:

Can the new feature ES0S 775 GB 4k SSD drives be used in a 5887 EXP24S in P7-8205-E6C?
I currently have a config for ES0H 775 GB SSD, but I rather use the newer, better drives.

Does anyone have a technical explanation for the differences in these different 775 gb SSD drives?

Thank You
_____
Paul Steinmetz
IBM i Systems Administrator

Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071

610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home

psteinmetz@xxxxxxxxxx
http://www.pencor.com/

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