Don,
1) What feature disk controller are you currently using?
2) Do you have a BP, I'm sure they could locate SSD drives.
3) Did you consider attaching a EXP24S for additional drives?
4) The SSD option will give you 4x the performance, switching from RAID6 to RAID5 will be slight.
5)Also, for future planning - BM announces end of service dates (no more maintenance) for various Power 6 and Power 7 platforms.
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
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