Dell PowerVault MD3000 Information Update page 8

Configuring the RAID Controller Module Network
RAID controller module network configurations can be assigned using a DHCP server (the default
setting). However, if a DHCP server is not available and the 10-second selection period times out, the
RAID controller modules use the 192.168.128.101 static IP address for controller 0. For controller 1,
the RAID controller modules use the 192.168.128.102 static IP address.
Password Resets
If a password reset is ever required, refer to the password reset procedure for the Dell PowerVault
MD3000 Storage Enclosure at http://support.dell.com. If you require help with this procedure,
contact Dell for technical assistance. For more information on contacting Dell, see the "Getting Help"
chapter of the Hardware Owner's Manual.
Issues and Workarounds using Red Hat Enterprise Linux (Version 3)
Users running Red Hat Enterprise Linux 3.0 should note the following issues and workarounds.
Skipped LUNs
The Red Hat Enterprise Linux SCSI layer does not support skipped (sparse) LUNs. If the mapped LUNs
are not contiguous, the kernel does not scan any of the remaining LUNs after the interruption.
Consequently, all LUNs after the skipped LUN are not available to the host.
The skipped LUNS can be accounted for by running hot_add to map the missing LUN numbers
each time the host is rebooted.
In-Band Management
Because the Linux 2.4 kernel does not support skipped LUNs, in-band management is not supported
on Red Hat 3.0. Use out-of-band management instead.
MPP Failover Driver Loading
The mpp_vhba failover driver component does not load unless a storage array is connected and a LUN
is mapped to the host server.
Follow these steps to ensure proper MPP driver loading and LUN mapping:
1 Ensure that the storage array is connected to the host server and that all installation instructions have
been completed, including the connection of the out-of-band (Ethernet) connections to each RAID
controller module.
2 Create a virtual disk and map it to LUN 0.
3 Reboot the host.
After the host is rebooted, the LUN is properly mapped and the MPP driver is loaded. Subsequently,
all other sequential LUNs can be created and registered to the OS by running hot_add.
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Information Update