The following is the price of the 4TB NL-SAS drive offered by Dell for PowerEdge 720xd.
4TB 7.2K RPM Near-Line SAS 6Gbps 3.5in Hot-plug Hard Drive [$663.38]
It seems to be too expensive. A similar drive is much cheaper (only ~ $300) on amazon.
Does anybody know whether the Seagate Drive from amaozon is considered as NL-SAS drive? If so, why there is such a huge difference in terms of price.
Also, if so, is it common to only purchase the minimal number of disks from Dell and purchase HDD from other venders and add these disks to the RAID later?
I'm considering the following RAID controllers. Do all of them allow me to add HDD later (or rebuild the RAID from scratch)? Thanks.
PERC H310 Integrated RAID Controller
PERC H710 Integrated RAID Controller, 512MB NV Cache
PERC H710P Integrated RAID Controller, 1GB NV Cache