- Community Home
- >
- Servers and Operating Systems
- >
- Operating Systems
- >
- Operating System - HP-UX
- >
- Re: Why we have activate the VGs in exclusive mode...
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
тАО09-20-2001 07:36 AM
тАО09-20-2001 07:36 AM
One question: In MC/SG, Why we have to activate the VGs in exclusive mode? What is the difference between share and exclusive mode? I need to know the detail.
Thanks in advance.
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-20-2001 07:38 AM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-20-2001 07:42 AM
тАО09-20-2001 07:42 AM
Re: Why we have activate the VGs in exclusive mode in MC/SG?
You definitely do not want more that one host to be altering a filesystem at a time - absolute chaos is assured. Shared mode is intended for the case where multiple hosts have the filesystem mounted read-only.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-20-2001 07:44 AM
тАО09-20-2001 07:44 AM
Re: Why we have activate the VGs in exclusive mode in MC/SG?
-Santosh
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-20-2001 07:48 AM
тАО09-20-2001 07:48 AM
Re: Why we have activate the VGs in exclusive mode in MC/SG?
Activation in "exclusive" mode is required so that only ONE operating system attempts read/write access to the disk. If this were not the case, you could not insure that either operating system would not overwrite the other's data or achieve any consistent view of in-memory data (not flushed to disk) vs. data written to disk!
Regards!
...JRF...
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-20-2001 08:07 AM
тАО09-20-2001 08:07 AM
Re: Why we have activate the VGs in exclusive mode in MC/SG?
When the VG is added as a cluster VG in the Cluster configuration, the cluster control the VG. It makes the Vg cluster aware and depending on the pckage with which that Vg is associated, it gets activated on the node on which the package is started.
The VG is activated in exclusive mode so that at a time only one node is accessing that VG. Sort of a locking mechanish. You cannot lock one disk on two systems at a time. Hence the Vg gets activated on one node only and that node has exclusive access to that VG.
hope this helps.
thanks