ok
comunque la mia intenzione era di poter supportare i 12Gbps/s e 8 porte totali per dischi fisici
le mie scelte sono queste per il momento (salvo altro suggerimento da più esperto di me):
LSI MegaRAID MR SAS 9361-8i 12G Scheda RAID 1GB
Key Features
- High-performance 12 Gb/s data transfer rates
- Eight internal 12 Gb/s SATA+SAS ports
- Two mini-SAS SFF8643 internal connectors (horizontal mount)
- SAS3108: 1.2 GHz PowerPC 476 dual-core 12 Gb/s ROC
- PCI Express 3.0 host interface
- Cache memory options: −1 GB 1866 MHz DDR3 SDRAM −2 GB 1866 MHz DDR3 SDRAM
- RAID levels 0, 1, 5, 6, 10, 50, and 60
- Support for CacheVault flash cache protection
Key Advantages
- 12 Gb/s solutions accelerate performance for next-generation data centers, web, and cloud
- Delivers enterprise-class data protection and security
- Preserves investment in 6 Gb/s and 3 Gb/s drives
- Support for Advanced Software options
- Connect up to 128 3 Gb/s, 6 Gb/s, or 12 Gb/s SATA and SAS devices
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DELL/LSI MegaRAID 9361-8i 1GB RAID PCI-E Controller 12gb/s SAS/SATA LSI 3108
- 2 Port miniSAS SFF-8643
- 12Gbps SAS / 6GBps SATA
- LSI RoC SAS3108
- PCIe x8 3.0 / 1024MB Cache
- RAID 0,1,5,6,10,50,60
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LSI 9340-8i IBM 46C9115 M1215 12GB: (quello senza cache)
LSI SAS3008 12 Gbps RAID on Chip (ROC) controller
Eight internal 12 Gbps SAS/SATA ports
Optional Two internal mini-SAS HD connectors (SFF-8643)
Supports 12, 6, and 3 Gbps SAS and 6 and 3 Gbps SATA data transfer rates
Up to 12 Gbps throughput per port
PCI Express 3.0 x8 host interface
Support both RAID and JBOD (pass-thru mode with system drives) configurations
Up to 32 drives, including hot spares, are supported in a RAID configuration.
Up to 64 drives are supported in a JBOD (non-RAID) configuration.
Support for RAID levels 0, 1, and 10 standard; support for RAID 5, 50 with optional upgrade
Zero Controller Cache, no battery/flash backup
Support for SAS and SATA hard disk drives (HDDs) and solid-state drives (SSDs)
Support for simple swap and hot swap drives
Support for intermixing SAS and SATA HDDs and SSDs. Mixing different types of drives in the same array (drive group) not supported.
Optional support for self-encrypting drives (SEDs) with MegaRAID SafeStore
Support for up to 32 virtual drives, up to 32 drive groups, up to 16 virtual drives per one drive group, and up to 32 physical drives per one drive group
Support for virtual drive sizes greater than 4 TB
Fixed stripe size of 64 KB
Mentre i dischi andrei di WD Ultrastar e fare un misto SAS e SATA cioè un raid fatto solo con i SAS per i dati più importanti e un altro raid creato con SATA per le archiviazioni di secondo livello quelle meno importanti, purtroppo una scelta dettata per contenere i costi visto che i sas costano di più e non possono essere riutilizzati per unità esterne in caso di aggiornamento dei TB se non una maggiore difficoltà nella rivendita di dischi SAS in quanto meno utilizzati