2. M110 Component Selection (13)
(2-4) Choose Host I/F
Notes: Single Controller Configuration
1) There is a case where the system crashes when a controller fails and although it is extremely
rare, data integrity cannot be guaranteed. To maintain higher reliability, a dual controller
configuration (standard model) is recommended.
2) Since write-cache is off, the write process does not use cache.
• 8/16Gb FC: High speed interface
• 10Gb iSCSI(Optical): High speed and easy connection interface
• 1/10Gb iSCSI(Copper): Low cost and easy connection interface
• 12Gb SAS: Low cost DAS(Direct Attached Storage) interface
• 16Gb FC and 10Gb iSCSI : Combo
(2-5) Dual Controller vs. Single Controller
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u
Characteristics
•
Pros
High Functionality/High Availability
Data Protection
Online Firmware update
Snapshot, In-box/Inter-box Replication
•
Cons
Higher cost than single controller configuration
u
Usage
Dual controller storage for requiring 24 hours x 7 days operation
(e.g.) System that provides services to users such as database
and groupware operation, etc.
Dual Controller Configuration
(Standard Model)
Single Controller Configuration
(Low Cost Model)
u
Characteristics
•
Pros
Lower cost than dual controller configuration
•
Cons
No support on cluster/FT server
No snapshot/data replication
No online Firmware upgrade
◆
Usage
Single Controller storage for back up data as the primary back up
(e.g.) System which has a backup server connected with a
storage unit (single controller) as the primary backup and
a tape drive as the secondary backup.
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