Go Directly To
Oracle Technology Network Community
My Oracle Support Community
OPN Cloud Connection
Oracle Employee Community
Oracle User Group Community
OTN Speaker Bureau
Get Started Guide
Join the world’s largest interactive community dedicated to Oracle technologies.
Learn from thousands of community experts
Get answers to your technical questions
Share your knowledge with peers
Please enter a title.
You can not post a blank message. Please type your message and try again.
Server & Storage Systems
This discussion is archived
on Dec 10, 2012 4:49 PM by Cindys-Oracle
Disk IO performance fine from LiveCD, abysmal after install
Dec 9, 2012 9:40 PM
I installed Solaris 11.1 from the live CD, and had the zpools mounted while running the live CD. Doing a scrub on both zpools the IO performance was fine, especially on the pool with a single SSD.
But once installed and boot from the hard disks the IO performance was abysmal < 5MB/s.
The system was running on the previous Oracle Solaris version, 11_11.
There are 2x 1000GB (rpool) of the shelf disks in there, and one 256GB SSD (ssdpool hosting Virtualdisk images), and 8GB RAM. The system was running fine before the upgrade.
Any idea where I should be looking for the cause of the performance drop?
I have the same question
Show 0 Likes
This content has been marked as final.
Show 1 reply
Re: Disk IO performance fine from LiveCD, abysmal after install
Dec 10, 2012 4:49 PM
in response to
I see your reply on the other thread, but I think we should rule out that the following known problem that is
related to poor SSD performance and your overall poor system performance:
- SUNBT7185015 Massive write slowdown on random write workloads due to SCSI unmap
The workaround is this:
In /etc/system add the following line:
Please apply the workaround and let us know if this helps.