Re: SSD/HDD Performance & Balancing -- MIDRANGE-L

Sue,

Answers in reverse order and thank you.

Workload snapshot in my opinion is too short and creates some of our own
issues.

I'm saying we're not mixed.

ASP 1 SSD's have their own controller.
ASP 1 HDD's have their own controller.
ASP 2 HDD's (CEC), Dev partition 2, own controller.

Controllers:
Resource Name Type-Model Status
DC01 57CD-001 Operational
DC06 574E-001 Operational
DC07 574E-001 Operational
DC08 2BD9-001 Operational
DC09 2BE1-001 Operational

Parity Resource Hot Spare Set ASP Unit Type Model Name Status
Protection 1 57CD 001 DC01 RAID 5/Availability N 1 1 58B2 109 DD002
Active 1 4 58B2 109 DD004 Active 1 3 58B2 109 DD003 Active 1 2 58B2
109 DD001 Active 2 2BD9 001 DC08 RAID 5 N 2 22 19A3 099 DMP051 Active 2
25 19A3 099 DMP010 Active 2 24 19A3 099 DMP024 Active 2 27 19A3 099
DMP050 Active 2 23 19A3 099 DMP053 Active 2 29 19A3 099 DMP047 Active
2 28 19A3 099 DMP045 Active 2 26 19A3 099 DMP055 Active 3 574E 001
DC07 RAID
5 N 1 17 198D 099 DMP030 Active 1 30 198D 099 DMP040 Active 1 20 198D
099 DMP035 Active 1 21 198D 099 DMP037 Active 1 18 198D 099 DMP031
Active 1 19 198D 099 DMP033 Active 4 574E 001 DC07 RAID 5 N 1 5 198D
099 DMP013 Active 1 16 198D 099 DMP018 Active 1 12 198D 099 DMP016
Active 1 7 198D 099 DMP003 Active 1 6 198D 099 DMP005 Active 1 10 198D
099 DMP025 Active 1 9 198D 099 DMP015 Active 1 11 198D 099 DMP007 Active
1 15 198D 099 DMP001 Active 1 13 198D 099 DMP012 Active 1 14 198D 099
DMP021 Active 1 8 198D 099 DMP028 Active

On Tue, Feb 24, 2015 at 2:40 PM, Sue Baker <sue.baker@xxxxxxxxxx> wrote:

Joe Wood <wood3875@xxxxxxxxx> wrote on Tue, 24 Feb 2015 19:08:27
GMT:

System: Power7 720, 8202 E4B, V7R1, AL730_142 firmware, 64gb
memory, 3-Processors active, Cumulative level 14143, TR9, all
other PTF groups & SSD recommends current. Mimix / Journaling
is in play, 5770SS1 42 HA Journal Performance installed,
configured/verified by Mimix. ASP 1 is Production/System, ASP
2 is a low use Development partition.

What type of disk controllers?

Are the SSDs and the HDDs attached to the same controllers?

ASP1 and ASP2 mixed on the same controllers?

Using trace followed by balance assumes when you trace you will
catch the "hot" sectors on disk which will remain hot until you
repeat the cycle. Does this match your business pattern? In
other words, the stuff you read on Friday during the peak is
likely to be the same stuff you will continue to access for the
next week?

--
Sue
IBM Americas Advanced Technical Sales Support (ATS) Power
Systems
Rochester, MN
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