Datasheet

“main” (Installation and Administration) — 2004/6/25 — 13:29 — page 148 — #174
i
i
i
i
i
i
i
i
3.11.3 Troubleshooting
Find out whether a RAID partition has been destroyed by the file con-
tents /proc/mdstats. The basic procedure in case of system failure is to
shut down your Linux system and replace the defective hard disk with a
new one partitioned the same way. Then restart your system and give the
raidhotadd /dev/mdX /dev/sdX command. This integrates the hard
disk automatically into the RAID system and fully reconstructs it.
3.11.4 For More Information
Configuration instructions and more details for Soft RAID can be found in
the HOWTOs at:
/usr/share/doc/packages/raidtools/Software-RAID-
HOWTO.html
http://en.tldp.org/HOWTO/Software-RAID-HOWTO.html
Linux RAID mailing lists are also available, such as http://www.mail-
archive.com/[e-mail].
3.12 Mass Storage via IP Networks —
iSCSI
One of the central problems in computer centers and when operating
servers is the provision of hard disk capacity for server systems. Fiber
channel is often used for this purpose in the mainframe sector. So far, UNIX
computers and the majority of servers are not connected to central storage
solutions.
linux-iSCSI provides a simple and reasonably inexpensive solution for con-
necting Linux computers to central storage systems. In principle, iSCSI rep-
resents a transfer of SCSI commands on IP level. If a program starts an in-
quiry for such a device, the operating system produces the necessary SCSI
commands. These are then embedded in IP packages and encrypted as nec-
essary. These packages are then transferred to the corresponding iSCSI re-
mote station.
To use iSCSI, you need the linux-iscsi package. The connection data
must be entered in the /etc/iscsi.conf file. If you have an iSCSI stor-
age device, this configuration file might look like this:
148 3.12. Mass Storage via IP Networks — iSCSI