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ARAIDoE AoE storage can
be directly connected to a server using
Ethernet. |
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Disks can be accessed individually
identified by their shelf and slot number. Coraid
refers to these AoE devices as storage "blades".
For example a disk in slot #4 of shelf #1 would be
accessed on a Linux system as /dev/etherd/e1.4,
(also referred to as EtherDrive storage blade
e1.4) |
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AoE target devices are just like
local disks. They can be used in addition to disks
that may already be installed inside the server
chassis. |
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RJ-45 Gigabit connections must use
CAT6 Ethernet cables to insure full operating
speed. Cross-over cables are not required, since
the Gigabit interface on Coraid's appliance auto
senses Ethernet cable
polarity. | |
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StorceTek SATA+RAID (SR) EtherDrive
Storage Appliances include RAID controller
functionality within the chassis to allow one or
more RAID sets to be accessed as "logical" AoE
devices called "logical blades" or "lblades". (ie.
lblade 1.1 shown here is a RAID5 made up of 5
disks in slots 0, 1, 2, 3, and 4, and accessed as
one large block storage device, such as
/dev/etherd/e1.1) |
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A simple console port command line
interface is provided on the Storage Appliance to
configure the RAID setup. |
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RAID can also be done from the
host, using server RAID
software. | |
ARAIDoE Storage
Appliance
with internal
RAID
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Using standard Ethernet networking
(ie. Ethernet switches) the number of AoE storage
devices can be expanded. |
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Each ARAIDoE storage appliance
is assigned a unique shelf number. |
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AoE packets are standard Ethernet
frames, and they can share a LAN with other LAN
traffic, however SourceTek recommends a separate
storage network to insure the highest storage
access performance. (ie. separate from the client
LAN traffic, as shown in the
diagram) | |
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Using standard Ethernet networking
multiple servers can access the same storage
network. |
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Storage is not captive to one
server, therefore if a server failure occurs, its
storage can be mounted by a backup server. |
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Using Ethernet you can construct
redundant connections between servers and storage,
eliminating single points of failure. |
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Clusters of servers can share
common storage using cluster
filesystems. | |
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