I've received a couple of email about setting up iSCSI under CentOS 4 or RHEL ES 4 server. Previously, I wrote about iSCSI under CentOS 5 / RHEL 5 server.
Requirements
[a] Following instructions tested on RHEL ES 4 and CentOS 4 only. (See RHEL 5/ CentOS 5 / Debian/ Ubuntu Linux specific instructions here).
[b] You need following information
[c] ISCSI Username
[d] ISCSI Password
[e] ISCSI Server IP / hostname
CentOS Linux v4.x - Install iscsi-initiator-utils
Type the following command:
# yum install iscsi-initiator-utils
Redhat ES Linux v4.x - Install iscsi-initiator-utils
Type the following command:
# up2date iscsi-initiator-utils
Configure iSCSI
Open /etc/iscsi.conf file, enter:
# vi /etc/iscsi.conf
Setup it as follows:
DiscoveryAddress=ISCSI_TARGET_HOST_OR_IP
OutgoingUserName=ISCSI_USER_NAME
OutgoingPassword=ISCSI_PASSWORD
LoginTimeout=15
Save and close the file.
Start the iscsi service
Type the following command to start iscsi service so that you can see block device:
# chkconfig iscsi on
# /etc/init.d/iscsi start
Run any one of the following to find out new block device name:
# fdisk -l
# tail -f /var/log/messages
# find /sys/devices/platform/host* -name "block*"
Format iSCSI device
Use fdisk and mkfs.ext3 commands. First, create a partition (assuming that /dev/sdc is a new block device assigned to iscsi) :
# fdisk /dev/sdc
# mkfs.ext3 /dev/sdc1
Create /mnt/iscsi directory:
# mkdir -p /mnt/iscsi
Open /etc/fstab file and append config directive:
/dev/sdc1 /mnt/iscsi ext3 _netdev 0 0
Save and close the file. Mount the parition /dev/sdc1:
# mount -a
# df -H
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