Siemens SIMATIC PANEL PC 877 - Manual (Page 155)

Maintenance and service
12.5 Installing Software
SIMATIC Panel PC 877
Operating instructions, Release 07/2006, A5E00877780-01
12-41
12.5.7.2 RAID system with Promise Fast Track Controller TX2300
RAID 0 system
A RAID 0 system (Stripe) enables you to increase the read/write speed of your hard disk
system. This configuration reduces the reliability of the drive system, however. RAID 0 is
therefore not recommended and is omitted from the installation instructions.
RAID 1 system
A RAID 1 system (mirroring) enables you to increase the data security of your hard disk
system. It involves copying (mirroring) the data to a second hard disk.
Each hard disk is operated on a separate SATA channel. The system can continue to
operate even when a problem is detected on one of the hard disks. The data backed up on
the RAID 1 network is retained. This data would be lost on a single drive or without RAID 1.
RAID 1 therefore increases the availability of the system.
Controller designation:
• SATA-RAID controller of type Promise Fast Track TX 2300 for SATA drives
This is a RAID1 system configuration (mirroring with two hard disks). The hard disk drive are
operated on separate channels of the RAID Controller. This enables the system to continue
to operate on one bus even when there is a problem with a cable and therefore increases
the availability of the system.
The RAID controller PCI card is installed in PCI slot 5 of the bus module.
Note
Information about the operation of the RAID system can be found in the Promise user
manual on the Documentation and Drivers CD supplied.