User's Manual

OpenVMS
Failure effectFault stimulus
Nonclustered-Processes fail.
Clustered—Other nodes running processes that used devices served from
the single-path HBA failed over access to a different served path. When
Server failure (host power-cycled)
the single-path node crashes, only the processes executing on that node
fail.
In either case, no data is lost or corrupted.
I/O is suspended or process is terminated across this HBA until switch is
back online. No data is lost or corrupted.
The operating system will report the volume in a Mount Verify state until
the MVTIMEOUT limit is exceeded, when it then marks the volume as
Mount Verify Timeout. No data is lost or corrupted.
Switch failure (SAN switch disabled)
I/O fails over to the surviving controller. No data is lost or corrupted.Controller failure
I/O is suspended or process is terminated across this HBA until EVA is
back online. No data is lost or corrupted.
The operating system will report the volume in a Mount Verify state until
the MVTIMEOUT limit is exceeded, when it then marks the volume as
Mount Verify Timeout.
Controller restart
If the LUN is not shared, I/O is suspended or process is terminated across
this HBA until path is restored.
If running OpenVMS 7.3-1 and the LUN is shared, another cluster node
having direct access will take over serving the device, resulting in no loss
of service.
Server path failure
In either case, no data is lost or corrupted.
The operating system will report the volume in a Mount Verify state until
the MVTIMEOUT limit is exceeded, when it then marks the volume as
Mount Verify Timeout.
I/O is suspended or process is terminated across this HBA until path is
restored. No data is lost or corrupted.
The operating system will report the volume in a Mount Verify state until
the MVTIMEOUT limit is exceeded, when it then marks the volume as
Mount Verify Timeout.
Storage path failure
Linux
Failure effectFault stimulus
OS reboots, automatically checks disks. HSV disks must be manually
checked unless auto mounted by the system.
Server failure (host power-cycled)
Short: I/O suspended, possible data loss.
Long: I/O halts with I/O errors, data loss. HBA driver must be reloaded
before failed drives can be recovered, fsck should be run on any failed
drives before remounting.
Switch failure (SAN switch disabled)
Short term: I/O suspended, possible data loss.
Long term: I/O halts with I/O errors, data loss. Cannot reload driver,
need to reboot system, fsck should be run on any failed disks before
remounting.
Controller failure
Short term: I/O suspended, possible data loss.
Long term: I/O halts with I/O errors, data loss. Cannot reload driver,
need to reboot system, fsck should be run on any failed disks before
remounting.
Controller restart
94 Single path implementation