- Community Home
- >
- Storage
- >
- Entry Storage Systems
- >
- MSA Storage
- >
- Re: MSA1500 SCSI redundant loop 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
тАО05-01-2007 03:56 AM
тАО05-01-2007 03:56 AM
MSA1500 SCSI redundant loop question
Example:
MSA1500
4 SCSI I/O modules
2 SCSI shelfтАЩs
Or
MSA1500
4 SCSI I/O modules
2 SATA shelfтАЩs
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-01-2007 05:11 AM
тАО05-01-2007 05:11 AM
Re: MSA1500 SCSI redundant loop question
And I hightly doubt that the controller firmware could deal with such a situation.
You _might_ have been confused by an MSA30 DB. That is a parallel SCSI drive drive enclosure with TWO connectors. Its SCSI module puts the first seven disk drive bays on one connector and the remaining seven bays on the second one (it is called 'split-bus').
The MSA20 has a single embedded SmartArray controller which is used to convert from 12 SATA links to one parallel SCSI interface. Again, there is no redundancy.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-01-2007 05:24 AM
тАО05-01-2007 05:24 AM
Re: MSA1500 SCSI redundant loop question
http://h18000.www1.hp.com/products/quickspecs/11742_div/11742_div.html
Fault Tolerance The dual bus I/O module, as well as redundant power supplies and fans, allows the MSA30 family to provide high levels of system availability.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-01-2007 05:35 AM
тАО05-01-2007 05:35 AM
Re: MSA1500 SCSI redundant loop question
each controller has four (4) parallel SCSI busses and both controllers are connected within the controller shelf to all 4 back-end SCSI busses which are then fed through the outside by 4 I/O modules.
So both controllers have concurrent access to all disk drives.
I thought you were asking for a redundant connection to the disk drives. Again, that is not possible.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-02-2007 12:09 AM
тАО05-02-2007 12:09 AM
Re: MSA1500 SCSI redundant loop question
BTW- even if you use snapshots or some other server-based safety measure, losing a shelf on the MSA will probably take the entire SAN offline anyway. We have two MSA1500cs with 4 MSA30 each. A faulty SCSI I/O module on a single shelf killed one MSA and locked up ever server that could see it. This took our entire SAN offline until the MSA connected to the shelf was rebooted.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-02-2007 12:15 AM
тАО05-02-2007 12:15 AM
Re: MSA1500 SCSI redundant loop question
no offense, but have you really mirrored with VR between two storage arrays, turned off one array and still had access to the data?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО05-02-2007 12:29 AM
тАО05-02-2007 12:29 AM
Re: MSA1500 SCSI redundant loop question
I do not like SVR and only recommend it because it is the only HP software I know of that provides some form of storage virtualization for the MSA. All SVR is going to do is create some snapshots that should lead to faster recovery of a failed array. There is not any software suite in the world that will stop the MSA from throwing a fit if it loses a shelf.
I am guilty of this myself, but no good can come from trying to get EVA/XP functionality out of an MSA. That├в s exactly what I tried to do with SVR and the end result was disappointing to say the least.