Description
HP P18420-B21 240GB SATA 2.5" SSD
The P18420-B21 is a 240GB SATA drive from HP, coded to the ProLiant line and built in the 2.5-inch SFF size at 6Gb/s. It carries a Read Intensive endurance rating. At this capacity, the drive has one job worth doing in a server, and that job isn't storing data. It's carrying the operating system, somewhere well away from everything else. It's an internal part, RoHS and WEEE compliant.
Key Features
- 240GB of capacity in a single 2.5-inch SFF body
- SATA interface running at 6Gb/s
- Read Intensive endurance rating, matched to volumes that read far more than they write
- HP ProLiant product line coding
- 2.5 inch SFF size, built for server drive bays rather than desktop cages
- RoHS and WEEE compliant, with internal fitting
Performance and Applications
Putting the operating system on the same array as your data looks tidy right up until something breaks. Rebuild that array and the host goes down with it. A pair of small drives mirrored purely for boot keeps the two jobs apart, so a data array can be rebuilt, grown or migrated while the server stays running and users carry on working. 240GB covers a hypervisor or a server operating system comfortably, and at this size buying two rather than one is an easy decision to defend.
Compatibility and Installation
You'll want two free 2.5-inch SFF bays if you're mirroring, a SATA connection on the backplane or controller, and carrier trays matched to your chassis generation. Build the mirror in the controller before the operating system goes on, rather than trying to convert a single drive into a pair afterwards.
HP P18420-B21 240GB SSD for Keeping Boot Off the Data Array
For a server where the operating system has to survive whatever happens to the data, this is sized exactly for that role. 240GB of Read Intensive SATA flash, coded for ProLiant bays.
