- Community Home
- >
- Storage
- >
- Entry Storage Systems
- >
- Disk Enclosures
- >
- MPIO Load Balance Policy and ALB relationship
Categories
Company
Local Language
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Forums
Discussions
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Community
Resources
Forums
Blogs
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-20-2008 10:01 AM
тАО05-20-2008 10:01 AM
This is in reference to the EVA Full Featured DSM for EVA4/6/8 Disk Arrays V3.00.00
Thanks,
Dave
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-20-2008 10:32 AM
тАО05-20-2008 10:32 AM
Re: MPIO Load Balance Policy and ALB relationship
A request through the proxy controller is forwarded to the owning one.
ALB makes sure that requests go only to the paths of the owning controller. It's my understanding that ALB goes first and then the LB policy is applied to these ports.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-20-2008 10:35 AM
тАО05-20-2008 10:35 AM
Re: MPIO Load Balance Policy and ALB relationship
I am familiar with the Active-Optimized and Active-Nonoptimized controller/path behavior.
So, you are saying the LB policy does nothing until ALB is enabled, correct?
Dave
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-20-2008 10:48 AM
тАО05-20-2008 10:48 AM
SolutionIf ALB is turned off, then LB could go over all EVA controller ports (e.g. when you have selected a round-robin policy).
If ALB is turned on, the LB does not use the ports of the non-owning controller.
--
By the way: there was a documented 'limitation' (I'd call it a bug!) in the V2 MPIO - I don't know if it is still in the V3 (don't have time to test it).
When there was at least one FC port on a server that did not have access to the EVA, ALB did not work at all. I've seen this on an EVA where all traffic was routed through the A controller.
Even if you modified the path preferrence to B, the MPIO did ignore it and the EVA moved the virtual disk ownership to the A controller after some time.
You had to set up a single preferred path on the MPIO to do a manual 'load balancing' between controllers.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО02-23-2009 04:52 AM
тАО02-23-2009 04:52 AM
Re: MPIO Load Balance Policy and ALB relationship
The MPIO DSM Manager is currently set to SQST with ALB off.
Is it recommended to turn on ALB?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО04-08-2009 06:43 AM
тАО04-08-2009 06:43 AM
Re: MPIO Load Balance Policy and ALB relationship
Sorry for the hijack..
I'm in a similar position with bl685c's and an eva8000. We are seeing I/O wait requests on a busy SQL box and I believe the MPIO to be at the core of the issue.
Is it recommended to have ALB enabled for performance?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-09-2009 12:15 AM
тАО08-09-2009 12:15 AM
Re: MPIO Load Balance Policy and ALB relationship
Have a look at this link for the explanation.
http://bizsupport1.austin.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=120&prodSeriesId=3664583&prodTypeId=12169&objectID=c01672894
cheers
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО08-10-2009 04:31 AM
тАО08-10-2009 04:31 AM