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5.9 Rescanning All Ports
You can tell the Galaxy 65 Subsystem to scan all disk ports for new or removed disk drives. You can use
this option when you install or remove disk drives. The rescan temporarily pauses all I/O processes, then
resumes normal operation.
If you are using an enclosure with an EMP, the Galaxy 65 Subsystem performs a rescan automatically.
With an EMP, the EMP detects the change in drive status and updates the Galaxy 65 Subsystem about
removed drives almost immediately; however, installed drives will be detected after a three-minute delay.
This delay is to allow the new drives to spin up.
To rescan all ports:
1 From SAM, select Manage Galaxy 65 Subsystem > Utilities.
The Rescan page displays.
2 Click Rescan.
5.10 Pausing I/O
Most drive enclosures allow you to remove and replace drives while FC device port activity continues.
However, you may still want to pause I/O if you are replacing more than one disk drive. The Hot Swap
Pause option suspends activity on all device channels used in the Galaxy 65 Subsystem, thereby
ensuring data integrity on the connected drives and arrays.
Caution Pausing I/O halts active I/O to the host.
Note
If you are not sure that your enclosure supports hot swapping, use the Hot Swap Pause option before
you remove or replace any drives in an array.
To pause I/O:
1 From SAM, select Manage Galaxy 65 Subsystem > Utilities > Hot Swap Pause.
The Hot Swap Pause page displays.
2 Click Pause.
3 When you have replaced the drive, resume I/O activity by clicking Unpause.
Caution Do not stay in the Hot Swap Pause mode for too long; otherwise, an operating system time-out may occur
(the time varies according to the operating system). For example, in Windows NT, the default limitation
during I/O activity is 10 seconds.