8440 3PAR enclosure design with 216 SSD disks

oby · **Joined:** Tue Jan 15, 2013 10:33 am **Posts:** 41

Hi,

what's the best enclosure design for a 8440 with 216x 1,92TB SSDs. Each node pair should have the same amount of disk shelves? I dont know how the included disk shelves are counted. Any ideas on this? Drive Cage HA is necessary.

Thanks

Tobias

nsnidanko · **Joined:** Mon Feb 03, 2014 9:40 am **Posts:** 116

Ideally you want to provide required capacity, bandwidth, latency and IOPS and your reseller will come up with a design.

8440 4-node system plus 10 SFF shelves (18 drives per shelf).
With Raid 5+1 you will have Cage HA. Raw capacity of 377 TB and 282TB usable. This should give you 295K front end IOPS. Plus service processor.

ailean · **Joined:** Wed Nov 09, 2011 12:01 pm **Posts:** 392

Yeah equal shelves per node pair and equal disks per node pair and shelf ideally.

Also depends how much free slots you want left for expansion, each node pair counts as the 1st shelf for that pair so minimum of 8 extra shelves (leaving 24 slots free) or say 16 extra shelves for 50% free.

Morbid · **Joined:** Tue Jun 13, 2017 2:57 am **Posts:** 19

Why absolutely 1,92Tb and not 3,84Tb ?

oby · **Joined:** Tue Jan 15, 2013 10:33 am **Posts:** 41

Morbid wrote:

Why absolutely 1,92Tb and not 3,84Tb ?

The 3,84TB SSDs are currently not affordable in germany

. We have a 8200 with 120 1,92tb ssds. We are merging the 1,92TB disks to the 8440 which comes with 96 1,92TB disks and 12 enclosures.

Why 8440:
The processing power of the 8200 with 120 ssds in combination with dedupe and later with compression is too low. Under really heavy load we are seeing service times about 10ms.

The 9450 is not affordable too

.

Thanks for your help!

Morbid · **Joined:** Tue Jun 13, 2017 2:57 am **Posts:** 19

oby wrote:

Morbid wrote:

Why absolutely 1,92Tb and not 3,84Tb ?

The 3,84TB SSDs are currently not affordable in germany

.

I thought that 1*3,84 was cheaper than 2*1,92

Darking · **Joined:** Wed Mar 05, 2014 10:55 am **Posts:** 77

Not if he allready owns 2/3rds of all the disks

oby · **Joined:** Tue Jan 15, 2013 10:33 am **Posts:** 41

The issue with 3,84TB is, that you wont get it over hpe renew / remanufactored. you need to buy it new.

Currently it is better to buy a whole 3PAR with disks instead a a bunch of similiar disks as upgrade... That sounds crazy, but you get a discount over 70% if you will buy the whole array.

markinnz · **Joined:** Tue Mar 29, 2016 9:32 pm **Posts:** 136

Also the 3.84TB drivers are cheaper for a reason ....

Classed as "Enterprise Value" (cMLC) and have a 3,000 to 5,000 NAND program/erase cycle.
vs 25,000 to 30,000 for "Enterprise mainstream" (eMLC)
and 100,000 to 200,000 for "Enterprise performance" (SLC)

cMLC are targeted for high read/low write applications
- have a 3 year service life at their targeted workload (as in you'll wear them out quicker doing intensive write applications)

eMLC are targeted for unrestricted read/write applications
- have a 3 year service life at their targeted workload

SLC Mission critical and High IOPS applicationss
- have a 3 - 5 year service life with unresitricted workloads

Darking · **Joined:** Wed Mar 05, 2014 10:55 am **Posts:** 77

does that really matter tho?

I believe HP gives 7 years warranty on all SSDs bought after june 2015.

https://www.hpe.com/h20195/v2/getpdf.as ... f?ver=10.0

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