- Community Home
- >
- Storage
- >
- Entry Storage Systems
- >
- Disk Enclosures
- >
- Continuous Access "Failsafe" 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
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
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
06-27-2005 02:56 AM
06-27-2005 02:56 AM
I'm reading the CA admin guide and don't quite understand this.
Failsafe mode
The failsafe mode specifies how host writes and remote replication behave when a group member
fails. The failsafe mode can be either:
• Failsafe enabled–If any virtual disk within the DR group fails or becomes unreachable, all host
writes and remote replication automatically stop. This preserves the order of the replicated data.
A failsafe–enabled DR group can be in one of two states:
• Locked (failsafe–locked)–Host writes and remote replication automatically stop.
• Unlocked (failsafe–unlocked)–Host writes and remote replication occur.
• Failsafe disabled–If any destination virtual disk (remote copy) within the DR group fails or
becomes unreachable, all host writes to the source DR group continue, but all remote replication
to the destination DR group automatically stops; the source DR group logs its host writes to the
DR group log until remote replication is re–established. If a source virtual disk fails, host writes
to the failed disk stop, as well as remote replication to its remote copy; host writes and remote
replication to the other members of the DR group continue normally.
Are there 3 modes?
Failsafe enabled Locked
Failsafe enabled Unlocked
Failsafe disabled
Can someone explain what happens in all three modes when a source virtual disk fails?
Can someone explain what happens in all three modes when a destination virtual disk fails?
TIA and points for
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
06-27-2005 02:59 AM
06-27-2005 02:59 AM
Re: Continuous Access "Failsafe" mode
Are is are there only two modes:
Failsafe enabled
Failsafe disabled
and when it's enabled it is set to unlocked if all virtual disks are accessible and in the event of any failure of a virtual disk it's set to locked and all access stops?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
06-27-2005 03:10 AM
06-27-2005 03:10 AM
Solution- failsafe disabled
- failsafe enabled
The second mode can have two different states:
- unlocked
-- host writes and remote replication works
- locked
-- there was an error and host writes and
-- remote replication has been stopped
The idea of the failsafe mode is that the data on source and destination must always been identical. For example, if the connection between the storage array has broken, all host writes will be blocked and there is no write history logging.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
06-27-2005 03:14 AM
06-27-2005 03:14 AM
Re: Continuous Access "Failsafe" mode
Can you give me an example of when this mode would be used?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
06-27-2005 03:47 AM
06-27-2005 03:47 AM
Re: Continuous Access "Failsafe" mode
The failsafe mode would only be used on explicit customer request - see the last paragraph in my previous message. Most customers don't have that extreme integrity requirements and rather have their processing continue, but the feature is there.