RE: New SSD options for IBM Power Systems provide enhancedperformanceat a lower cost

Steve,

I know I'm fine for now, but I want to better understand the differences, and our R/W ratios.
Also, it could become a factor for future DASD/SSD purchases.
The rules of the game our changing.
From number of arms to buffer sizes, and now R/W ratio.

I'm still puzzled and confused on how a SSD can "wear out" when no moving parts.
Or is this another "marketing strategy".

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Steve Pavlichek
Sent: Wednesday, April 20, 2016 8:07 AM
To: Midrange Systems Technical Discussion
Subject: Re: New SSD options for IBM Power Systems provide enhancedperformanceat a lower cost

Paul,
No need to worry about wearing out your current SSDs. The maintenance policy change only affects the new 1.9TB Read Intensive drives. IBM has published a tool for customers to monitor the wear cycle on these new drives called the IBM i SSD Fuel Gauge.

www.ibm.com/developerworks/ibmi/techupdates/hw/issdfuelgauge

If your just interested in read/write ratio I would recommend running the Resource Report under Performance Tools Reports. This will show you the R/W ratio for each PT time slice(Typically 15 minutes).


-----Original Message-----
From: Steinmetz, Paul
Sent: Tuesday, April 19, 2016 4:26 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: New SSD options for IBM Power Systems provide enhancedperformanceat a lower cost

Steve,

If I currently have 100% SSD in Production LPAR, is there a way to determine if I'm read or write intensive?

Production LPAR P7 740 82051-E6C
V7R1 Latest CUM, TR11
155 gb mem
1.5 CPU
5913 PCIe2 1.8GB Cache RAID SAS Adapter Tri-port 6Gb 100% SSD (13) ES0H 775GB SFF-2 SSD for IBM I Raid5, 2 parity sets, 2 hot spares.
Disk response time - .2 ms no wait time -
Increases from .2 to 2.0 during nightly save 577D 8 Gigabit PCI Express Dual Port Fibre Channel Adapter

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Steve Pavlichek
Sent: Tuesday, April 19, 2016 3:57 PM
To: Midrange Systems Technical Discussion
Subject: Re: New SSD options for IBM Power Systems provide enhanced performanceat a lower cost

One item to note on the 1.9TB SSDs. These are high capacity/low cost SSDs designed for READ intensive applications and do not carry the typical IBM maintenance. Once they reach their “Write” limit they are considered worn out and IBM will not replace them under maintenance contract.

•Write intensive workloads can “wear out” the drive -- watch your fuel gauge to monitor usage •Approximately 3,394 TB of data can be written to drive, but may be somewhat larger •Drive Write Per Day (DWPD) rating of “1”
•Use RI SSD when you are confident your write workload is reasonable



-----Original Message-----
From: Steinmetz, Paul
Sent: Tuesday, April 19, 2016 3:23 PM
To: 'Midrange Systems Technical Discussion'
Subject: New SSD options for IBM Power Systems provide enhanced performanceat a lower cost

Do number of arms still matter?

http://www-01.ibm.com/common/ssi/cgi-bin/ssialias?infotype=an&subtype=ca&appname=gpateam&supplier=897&letternum=ENUS116-036

http://www-01.ibm.com/common/ssi/rep_ca/6/897/ENUS116-036/ENUS-116-036-LIST_PRICES_2016_04_12.PDF



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<mailto:psteinmetz@xxxxxxxxxx>
http://www.pencor.com/

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