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Winner
"Best Storage Solution"
LinuxWorld 2005 |
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CORAID
First Partner in China |
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- Coraid's SATA+RAID EtherDrive Storage Appliance
includes 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/1.1)
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- A simple console port command line interface is
provided on the SATA+RAID EtherDrive Storage Appliance
to configure the RAID setup
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- Multiple RAID sets can be created within one storage
shelf. Combinations of different RAID set types
are allowed, including RAID0 (stripe), RAID1 (mirror),
RAID10 (stripe of mirrors), and RAID5 (stripe with
parity).
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- RAID sets can be expanded with a grow command.
This allows RAID sets to be concatenated (when the
first RAID set is full, data is stored on the concatenated
member RAID set).
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- RAID sets can be protected with one or more spare
disks within the chassis. A single spare disk can
protect multiple RAID sets.
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- The diagrams to the left, show a RAID5 set with
a failed disk in slot #1. If there is no spare disk
the storage is still fully accessible but in a degraded
(unprotected) mode. If a spare disk is available
(shown in slot #13), the RAID will automatically
rebuild the RAID set using the spare disk. When
the failed disk has been replaced, it will typically
be assigned as the spare disk (or the RAID set can
be rebuilt again with the original disk slot).
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- Coraid's EtherDrive RAIDBlade/20 appliance is
an AoE target device for servers, and an AoE initiator
for AoE storage devices.
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- RAIDBlade/20 provides a means of creating RAID
sets that span multiple shelves of EtherDrive storage
blades or SATA+RAID storage appliances.
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- Shown in the diagram on the left lblade 1.2 spans
disks installed shelf #1, #2 and #3 and can be any
RAID set type.
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- RAIDBlade/20 eliminates the need for server software
RAID, when RAID sets span multiple shelves.
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- With RAIDBlade/20 a single volume can grow to
an unlimited size.
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- RAIDBlade/20 can provide storage virtualization
of up to 63 separate AoE storage devices or arbitrary
size. Each "virtual blade" can be a single
disk or a RAID set of unlimited size or concatenated
RAID sets.
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