Rescanning All Ports; Pausing I/O - Impediment RS-1600-X24 User Manual

5.9 Rescanning All Ports

You can tell the X24 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 X24 Subsystem performs a rescan automatically. With an
EMP, the EMP detects the change in drive status and updates the X24 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 X24 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 X24 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 X24 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.
System Configuration
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