- Community Home
- >
- Storage
- >
- Entry Storage Systems
- >
- Disk Enclosures
- >
- Primary/alternate links, VA7400 and LVM
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
тАО03-18-2004 01:21 AM
тАО03-18-2004 01:21 AM
I am using VA7400 with 2 HP-UX servers and 2 Brocade. My question is about LUNs and primary/alternate links for VGs.
I successfully created a LUN in redundancy group 1 and when I want to create a new VG or extend previously created VG on the disk-array with this LUN, how can I determine which device is primary link and which is secondary link
Best Regards
Murat
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-18-2004 01:57 AM
тАО03-18-2004 01:57 AM
Re: Primary/alternate links, VA7400 and LVM
vgdisplay -v
if you need to reverse:
vgreduce
vgextend
(LVM automatically makes the alternate link the primary after the vgreduce, so vgextend with the same device will make that device the alternate link)
Regards,
Bernhard
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-18-2004 02:54 AM
тАО03-18-2004 02:54 AM
Re: Primary/alternate links, VA7400 and LVM
I already know this command, but HP configured our initial VGs,
I attached a file about ioscan -funC disk and vgdisplay -v
For example vg01 has 4 LUN and first 2 LUN's primary link different from others. I cannot figured out. and vg02 also has 4 LUN and all of them has belong to same primary link.
So I want to learn how to configure array but I don't understand primary links and LUNs with these situation
Thanks for your response,
Best Regards
Murat
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-18-2004 09:33 AM
тАО03-18-2004 09:33 AM
SolutionI assume that you have 2 separate SAN fAbrics. The host hba that's attached to the fabric with controller 1 of your VA7400 should be your primary path for the LUNs you create in redundancy group 1. The opposite is true for the LUNs you create in redundancy group 2.
We have 2 SAN fabrics with two VA7400's but we are NOT using the same Domain ID's on both fabrics.
You will need to match your host hba's with the VA7400 hba's and assign primary and secondary accordingly.
Regards,
Jim
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО03-22-2004 12:18 AM
тАО03-22-2004 12:18 AM
Re: Primary/alternate links, VA7400 and LVM
LVM uses the alternate link for data transfer only if the primary link fails.
You have two HBAs and so for each LUN you have two path.
In order to setup a static load balancing using *both* paths you would usually alternate the primary link either for each LUN or with each VG
This has not been done consistently. If I were you I would use vgreduce/vgextend and make the /dev/dsk/c5 device files the primary link for all even LUNs (d0, d2, d4, d6) and the /dev/dsk/c7 device files the primary link for all odd LUNs (d1, d3, d5, d7).
As long as ioscan -fnCdisk shows all devices claimed you can do this without risk and on the fly.
Regards,
Bernhard