- Community Home
- >
- Storage
- >
- Entry Storage Systems
- >
- Disk Enclosures
- >
- Re: EMA question...
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
тАО11-08-2009 11:22 PM
тАО11-08-2009 11:22 PM
I want to configure the PREFERRED_PATH switch for each storage unit.
I know the command to do so is....
PREFERRED_PATH=OTHER_CONTROLLER
PREFERRED_PATH=THIS_CONTROLLER
but my question is, can this configuration be done online, while the storage unit is still presented to the server?
Or do first I need to unpresent the storage unit from the server?
Any server reboot required?
Please advice.
Thanks in advance.
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-10-2009 03:52 AM
тАО11-10-2009 03:52 AM
Re: EMA question...
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-10-2009 10:29 PM
тАО11-10-2009 10:29 PM
Re: EMA question...
------------------------------------------------------------------------------
D21 R273
LUN ID: 6000-1FE1-0013-F3C0-0009-1280-4335-0175
NOIDENTIFIER
Switches:
RUN NOWRITE_PROTECT READ_CACHE
READAHEAD_CACHE WRITEBACK_CACHE
MAX_READ_CACHED_TRANSFER_SIZE = 32
MAX_WRITE_CACHED_TRANSFER_SIZE = 32
Access:
03004_1A1, 03004_1B1, 03004_2A2, 03004_2B2
State:
ONLINE to this controller
Not reserved
NOPREFERRED_PATH
Size: 284389034 blocks
Geometry (C/H/S): ( 278813 / 4 / 255 )
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-10-2009 10:32 PM
тАО11-10-2009 10:32 PM
Re: EMA question...
Now, I want to set it to use a preferred path.
So can this be done online while the storage unit is still presented to the server?
Or do first I need to unpresent the storage unit from the server?
Any server reboot required?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-10-2009 11:26 PM
тАО11-10-2009 11:26 PM
Re: EMA question...
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-11-2009 02:16 AM
тАО11-11-2009 02:16 AM
Re: EMA question...
Do you have a path management s/w at host side?
Array like EMC Symmetrix is active/active and load will be distributed across all paths. While EMC Clariions works active/passive and we can set a default owner or a preffered path and only those path is used till a fail over.
I dont know how your array works and a preffered path setting is required or not.
So why do you want to set a prefferd path??
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-11-2009 05:41 AM
тАО11-11-2009 05:41 AM
SolutionThe preferred path can be changed at any time - it is only a hint when both controllers start. An explicit path selection is usually done from the host operating system (which is not mentioned).
It can be changed without a controller restart, but WARNING: THIS MEANS DATA UNAVILABILITY:
> set D21 NORUN
> set D21 PREFERRED_PATH=OTHER_CONTROLLER
> set D21 RUN
AGAIN, THIS MAKES UNIT D21 TEMPORARILY UNAVAILABLE!!
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-29-2009 07:12 PM
тАО11-29-2009 07:12 PM
Re: EMA question...
I've read the HSG80 CLI reference guide and it does not say anything about shutting down access to the UNIT when setting the PREFERRED PATH.
Are you 100% sure it cannot be done online?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-29-2009 10:58 PM
тАО11-29-2009 10:58 PM
Re: EMA question...
- you can modify the setting online, but it has no effect until you restart the controllers
- if you want to move the unit online:
-- use a host-based mechanism
--- e.g. Secure Path interface
--- Tru64 has an embedded utility
--- OpenVMS has a DCL command