Don,
Another option, if possible, would be to use a different raid controller with more cache.
This would also reduce your IO.
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Steinmetz, Paul
Sent: Saturday, November 25, 2017 6:45 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Downgrade from RAID6 to RAID5
Don,
The memory will definitely help, reduce paging which will reduce IO.
Another option I didn't mention is PCI flash adapter.
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Don Brown
Sent: Saturday, November 25, 2017 6:39 PM
To: Midrange Systems Technical Discussion
Subject: RE: Downgrade from RAID6 to RAID5
Hi Paul - I have answered your questions below ...
Don Brown
From: "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'"
<midrange-l@xxxxxxxxxxxx>
Date: 24/11/2017 11:27 PM
Subject: RE: Downgrade from RAID6 to RAID5
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>
Don,
1) What feature disk controller are you currently using?
FC5630
2) Do you have a BP, I'm sure they could locate SSD drives.
I am a BP !! I have checked all options I am aware of and nothing NEW is available.
3) Did you consider attaching a EXP24S for additional drives?
While this is an excellent option not in current budget.
4) The SSD option will give you 4x the performance, switching from RAID6 to RAID5 will be slight.
At this stage any gain is a blessing - at EOM system can slow to a point where users have trouble logging on.
We are going to add 1 more driver, double memory and switch from RAID6 to RAID5. I think that is all we can do without SSD's or new box.
5)Also, for future planning - IBM announces end of service dates (no more
maintenance) for various Power 6 and Power 7 platforms.
Yes i am aware this box has EOL in 2019.
https://www-01.ibm.com/common/ssi/cgi-bin/ssialias?infotype=AN&subtype=CA&htmlfid=897/ENUS917-163&appname=USN
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Don Brown
Sent: Friday, November 24, 2017 1:54 AM
To: Midrange Systems Technical Discussion
Subject: Downgrade from RAID6 to RAID5
Hi All,
Long story short.
Have a system at 7.3 with 6 x 139GB spinning disks RAID6 and a disk write performance issue.
As RAID6 will require three writes to update all striping and RAID5 will need two theoretically converting from RAID6 to RAID5 should provide a performance increase ?
There is no space for additional drives in this system - Mirrored pair are used in Asp02
SSD's is not an option because both IBM and IBM remarketing both do not have any of the required drives for this model 8202-E4B
We are considering second hand SSD's but not a preferred option.
Has anyone changed the RAID configuration from 6 to 5 and have any comments on the process ?
Thanks
Don Brown
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit:
https://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at
https://archive.midrange.com/midrange-l.
Please contact support@xxxxxxxxxxxx for any subscription related questions.
Help support midrange.com by shopping at amazon.com with our affiliate
link:
http://amzn.to/2dEadiD
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit:
https://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at
https://archive.midrange.com/midrange-l.
Please contact support@xxxxxxxxxxxx for any subscription related questions.
Help support midrange.com by shopping at amazon.com with our affiliate
link:
http://amzn.to/2dEadiD
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please visit
http://www.symanteccloud.com ______________________________________________________________________
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit:
https://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at
https://archive.midrange.com/midrange-l.
Please contact support@xxxxxxxxxxxx for any subscription related questions.
Help support midrange.com by shopping at amazon.com with our affiliate link:
http://amzn.to/2dEadiD
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit:
https://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at
https://archive.midrange.com/midrange-l.
Please contact support@xxxxxxxxxxxx for any subscription related questions.
Help support midrange.com by shopping at amazon.com with our affiliate link:
http://amzn.to/2dEadiD
midrange.com
