|
Not fewer than 6 on any production system.
But, as usual, it matters what YOUR I/O load is six may still not be
sufficient.
- Larry "DrFranken" Bolhuis
www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.
On 8/9/2018 11:22 AM, Steinmetz, Paul wrote:
With the new large P9 SSD announced, I have to ask, what is theThis is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
recommended minimum number of drives, obviously for performance only
reasons.
Our current production lpar is 7 tb, 13 - 775gb, Raid5, 2 Raid sets, 2
hot spares.
Theoretically, I could configure a new P9 with fewer SSD, various options.
The number of arms is the key question.
How many?
I was even considering combining all the LPARs DASD to one, which would
increase the number of arms, then letting it host the R&D and other LPARS.
Food for thought.
18-061 -IBM Power Systems enhances I/O with mainstream 2.5-inch SAS
SSDs
http://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/
ssi/rep_ca/1/897/ENUS118-061/index.html&lang=en&request_locale=en
Mainstream SSDs
New 931 GB, 1.86 TB, 3.72 TB, and 7.45 TB mainstream 2.5-inch SAS SSDs
are introduced for POWER9 and POWER8 technology-based servers using SAS
bays. These drives are supported in POWER9 and POWER8 system units (SFF-3)
and in expansion drawers such as the EXP24SX attached to POWER9 and POWER8
servers (SFF-2). With their large capacity and lower cost per gigabyte, the
drives can provide a very cost-effective and footprint-effective solution
for many mainstream configurations. Note these drives are designed for
workloads with modest write requirements, including as boot drives where
SSD performance is desired. These drives are rated at 1 DWPD, meaning you
can write 931 GB, 1.86 TB, 3.72 TB, or 7.45 TB to the SSD every day for
five years, nearly 1.7 PB for the 931 GB SSD.
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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