Dell PowerVault MD3000 - Manual (Page 114)

114 Hardware Considerations
2 After attaching the SAS cables, wait at least three minutes for the EMM to
reach optimal state.
NOTE: You may experience a transitional failure on multiple EMMs in the MEL log
while the system updates.
Removing and Inserting Physical Disks
Refer to the following guidelines to ensure that physical disks are safely
removed from and inserted into the MD3000/MD3000i RAID storage array.
• Wait at least 60 seconds between removing a drive and inserting a
replacement.
• When pulling a drive from a storage array to move it to a different slot,
wait 60 seconds before inserting the drive into the new slot.
• Wait at least 60 seconds between the removal of drives from a storage
array.
• Wait at least 60 seconds between the insertion of drives into a storage
array.
In a large configuration, storage management software may take up to
10 seconds to detect hardware changes.
MD3000 Maintenance Considerations
For Linux kernels, stop and then restart the SMagent after performing one of
the following maintenance tasks:
• Move a controller offline or replace a controller.
• Remove SAS cables from or attach SAS cables to host servers running Red
Hat ® Enterprise Linux
®
(version 4), SUSE
®
Linux Enterprise Server 9, or
SUSE Linux Enterprise Server 10 operating systems.
NOTE: If a Resolve Topology Conflicts message appears in the Status portlet of the
Summary page after restarting the SMagent, it may be necessary to restart the host
server to clear this message. Do not select the Resolve selection in the Topology
Conflict wizard. The MD3000 will continue to service I/O requests, but the array
could become partially managed if only in-band management is used. Stop all I/O
operations on any host servers that were involved in the maintenance operation
and restart the system.