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LaCie Biggest S2S
User Manual
page
Setting Up Your Biggest S2S
3.1. Storage Policies
Before you use the LaCie Biggest S2S Manager to
configure the Storage Appliance, take a minute to study
the following terms. The terms represent The LaCie
Biggest S2S configuration options or storage policies for
mapping the physical to the virtual drives. You’ll choose
from these policies during the configuration process.
Your choice is important and impacts how best you can
use the Storage Appliance.
JBOD
A storage policy that grants the host PC direct access to a physical disk drive. With JBOD (just a bunch
of disks), the number of available drives is equal to the number of physical drives. JBOD is also called the
bypass mode as the host bypasses the LaCie virtualization engine to directly access the disk.
Safe
A storage policy configuration in which all data is stored in duplicate on separate disks to protect against
data loss due to disk failure. At least two drives mirror each other at all times, equivalent to RAID 1. Each
write goes to both disks. Safe provides the highest level of data protection but halves the amount of stor-
age space since all data must be stored twice. To implement the Safe storage policy, the Basic Configura-
tion Mode creates two volumes. Each volume consists of two hard disk drives that mirror each other. The
remaining hard disk drive is specified as a Hot Spare for both volumes.
Fast
A storage policy configuration in which I/O processing is balanced evenly to all disks in a method known
as striping, equivalent to RAID 0. Fast offers the best performance in terms of speed but no redundancy
of data. Striping increases storage operation speed by using several disk drives in parallel. Each portion of
data is divided into segments which are written to different disks simultaneously. Striping provides im-
proved performance but does not enhance reliability because there is no way to retrieve or reconstruct data
stored on a failed drive. Please check the LaCie website for updates of the User’s Manual reflecting product
updates.
Big
A storage policy configuration in which multiple physical drives are strung together (concatenated) and
treated as one large volume. Big provides the maximum amount of storage space but no additional perfor-
mance or data redundancy. This configuration allows you to increase logical volume size beyond the capacity
of individual drives. The Basic Configuration Mode implements the Big storage policy by concatenating all
the hard disk drives into a single volume.
Safe+Big
A storage policy configuration in which one-half of the available storage space is concatenated. The other
half mirrors the first half to provide full data redundancy. The Safe + Big storage policy configuration mir-
rors the concatenated disks to create a volume consisting of four disk drives. The Basic Configuration Mode
designates the remaining hard disk drive as a Hot Spare.
Safe+Fast
A volume configuration in which an array of stripes is created. Each stripe consists of two mirrored drives.
Safe + Fast provides the I/O load balancing features of striping and the added reliability of mirrored data,
equivalent to RAID 1+0. In the Safe + Fast storage policy, data is written to mirrored disks in a striped
format to create a volume consisting of four disk drives. The Basic Configuration Mode designates the
remaining hard disk drive as the Hot Spare.