HP MDS600 HP BladeSystem Deployment Guide for Solutions with 6Gb SAS BL Switch - Page 49

High availability / dual domain information

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4 High availability / dual domain information HP External SAS BladeSystem Solutions provide high availability, offering c-Class BladeSystem users full connectivity to External SAS storage by using the following redundant hardware components: • Two controllers in each external shared SAS storage enclosure • Two I/O modules in each MDS600 or D6000 storage enclosure drawer (four per enclosure) or D2600/D2700 storage enclosure. • Two SAS BL Switches in the BladeSystem c-Class enclosure interconnect row • One or more P711m, P712m, or P721m/P731m controllers in each server • Dual-ported SAS hard drives in the external SAS storage enclosures • Redundant power supplies and fans in the BladeSystem c-Class enclosures and external SAS storage enclosures. Using redundant components ensures high availability. If any component in the path between the server and the storage fails, management software will automatically fail over all I/O to the alternate path. Although single-controller shared SAS external storage enclosures and single I/O module zoned SAS external storage enclosures are supported for use in single-domain environments, the dual-controller/dual I/O module models are required in high availability environments. With two controllers/two I/O modules, high availability is ensured if one of the controllers/I/O modules fails. During a failover event, all processing is performed by the remaining controller/I/O module, with no interruption to the flow of data. When configuring the storage, the storage enclosures offer a variety of RAID levels, allowing a user-selected level of performance and fault tolerance. For more information about RAID levels and configuring the MSA 2040 SAS or P2000 G3 SAS MSA storage, see the HP MSA 2040: Best Practices white paper at http://www.hp.com/go/msa2040. For more information about RAID levels and configuring the or P2000 G3 SAS MSA storage, see the or HP MSA2000 G1, MSA 2000 G2, and P2000 G3 MSA Best Practices white paper at http://www.hp.com/go/P2000 (under Resource Library). NOTE: HP SSA can perform all the functions that HP ACU can, along with added features not available with ACU. For more information, see the HP Smart Storage Administrator User Guide. For more information about RAID levels and configuring the D2600/D2700, MDS600, or D6000 storage, see the Configuring Arrays on Smart Array Controllers Reference Guide, at http:// h18000.www1.hp.com/products/servers/proliantstorage/software-management/acumatrix/. Although beyond the scope of this document, clustering is supported in BladeSystem environments, providing another level of fault tolerance. For more information about clustering support see the QuickSpecs for your storage enclosure. 49

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4 High availability / dual domain information
HP External SAS BladeSystem Solutions provide high availability, offering c-Class BladeSystem
users full connectivity to External SAS storage by using the following redundant hardware
components:
•
Two controllers in each external shared SAS storage enclosure
•
Two I/O modules in each MDS600 or D6000 storage enclosure drawer (four per enclosure)
or D2600/D2700 storage enclosure.
•
Two SAS BL Switches in the BladeSystem c-Class enclosure interconnect row
•
One or more P711m, P712m, or P721m/P731m controllers in each server
•
Dual-ported SAS hard drives in the external SAS storage enclosures
•
Redundant power supplies and fans in the BladeSystem c-Class enclosures and external SAS
storage enclosures.
Using redundant components ensures high availability. If any component in the path between the
server and the storage fails, management software will automatically fail over all I/O to the alternate
path.
Although single-controller shared SAS external storage enclosures and single I/O module zoned
SAS external storage enclosures are supported for use in single-domain environments, the
dual-controller/dual I/O module models are required in high availability environments. With two
controllers/two I/O modules, high availability is ensured if one of the controllers/I/O modules
fails. During a failover event, all processing is performed by the remaining controller/I/O module,
with no interruption to the flow of data.
When configuring the storage, the storage enclosures offer a variety of RAID levels, allowing a
user-selected level of performance and fault tolerance. For more information about RAID levels and
configuring the MSA 2040 SAS or P2000 G3 SAS MSA storage, see the
HP MSA 2040: Best
Practices
white paper at
h
t
tp://w
w
w
.hp
.co
m/go/ms
a20
4
0
. For more information about RAID
levels and configuring the or P2000 G3 SAS MSA storage, see the or
HP MSA2000 G1, MSA
2000 G2, and P2000 G3 MSA Best Practices
white paper at
h
t
tp://w
w
w
.hp
.co
m/go/P2000
(under Resource Library).
NOTE:
HP SSA can perform all the functions that HP ACU can, along with added features not
available with ACU. For more information, see the
HP Smart Storage Administrator User Guide
.
For more information about RAID levels and configuring the D2600/D2700, MDS600, or D6000
storage, see the
Configuring Arrays on Smart Array Controllers Reference Guide
, at
h
t
tp://
h1
8
000.w
w
w1
.hp
.co
m/pr
odu
c
ts/s
e
r
v
e
r
s/pr
o
li
an
ts
t
o
r
age/s
o
f
t
w
ar
e
-manage
me
n
t/ac
umatr
i
x/
.
Although beyond the scope of this document, clustering is supported in BladeSystem environments,
providing another level of fault tolerance. For more information about clustering support see the
QuickSpecs for your storage enclosure.
49