Table of Contents
Advertisement
7. Web Management - Storage
The UMG-2000 storage suite includes the following services: Redundant Array of
Independent Disks (RAID), Network Storage Server, backup/restore, and remote data
synchronizing.
RAID AND JBOD
The UMG-2000 supports RAID on storage devices. A RAID device is a logical device that
has physical devices underlying it. These physical devices are disk partitions. The
supported RAID levels are:
Level 0:
Provides data striping, or the spreading out of blocks of each file across multiple disk
drives but without redundancy. This improves performance but does not deliver fault
tolerance. If one drive fails then all data in the array is lost.
Level 0+1:
RAID 0+1 is a mirrored configuration of two striped sets. This is a technique in which
data is written to two duplicate disks simultaneously, providing data redundancy.
Level 5:
Provides data striping and utilizes one disk for backup information, which enables it to
restore any other disk in the array.
On top of the RAID, the UMG-2000 supports Logical Volume Management (LVM2) that
provides a higher-level view of the disk storage on a computer system than the traditional
view of disks and partitions. This gives the system administrator much more flexibility in
allocating storage to applications and users. Storage volumes created under the control of
the LVM can be resized and relocated. The LVM also allows management of storage
volumes in user defined groups, allowing the system administrator to deal with sensibly
named volume groups.
Another choice other than RAID is the technology of "Just a Bunch Of Disks" (JBOD). The
RAID system stores the same data redundantly on multiple disks that nevertheless appear
to the operating system as a single disk. Although, JBOD also makes the disks appear to
be a single one, it accomplishes that by combining the drives into one larger logical disk.
JBOD doesn't deliver any advantages over using separate disks independently and doesn't
provide any of the fault tolerance or performance benefits of RAID.
NETWORK STORAGE SERVER
The UMG-2000 supports Server Message Block (SMB), also known as Common Internet
File System (CIFS) to share files on the private network which can be used for WINDOWS,
Linux/Unix and other operating systems and Network File System (NFS) clients/servers.
48
Advertisement
Table of Contents
