Description
HP RM 435i DVDROM Retail Kit Black
HP supports both software-based and hardware-based RAID.
For example, HP now implements software RAID in embedded SATA controllers in some of the ProLiant servers and RBSU is used to enable it.
Software-based RAID
It is possible to have a RAID configuration without an array controller. This is known as software RAID.
With software-based RAID, the array management functions are implemented by software executing in a host environment such as the operating system.
Software RAID requires additional transfers across the I/O bus.
Although software RAID is not as versatile as hardware RAID, it offers a cost-effective, entry-level, fault-tolerant solution.
The advantages of software-based RAID are:
- The ability to span multiple host controllers (duplexing)
- Lower cost
Hardware-based RAID
With hardware-based RAID, the array management functions are implemented by the hardware and firmware within a RAID controller. The RAID controller orchestrates read and write activities in the same way a controller for a single disk drive does, treating the array as if it were a single physical or logical drive.
Hardware-based RAID is transparent to the host software and is self-contained within the storage solution. It does not interfere with the primary function of the host, which translates into higher overall performance and a potential for advanced RAID capabilities.
With a hardware RAID solution, there is no extra activity on the I/O bus, memory bus, or frontside bus after the data reaches the array controller. All RAID-related activities are local to the array SCSI bus. When a single sector is written to the disk, 64 transfers are executed on a 64-bit PCI bus.
The advantages of hardware-based RAID are:
- Faster, more reliable performance than software RAID
- Support for RAID 1+0 or RAID ADG
- Support for online spare drives
- Decreased processor load
- User-friendly configuration utilities
- No operating system interface required when starting a rebuild
Advantages of HP hardware-based RAID
HP implements RAID at the hardware level with value-added features in its Smart Array controllers. The advantages of HP hardware-based RAID are:
- Safe write caching through a battery-backed array accelerator on some models
- Superior manageability such as multiple volumes with different RAID levels
- High flexibility such as separating I/O in to different disk volumes
- Automatic recovery and online spares
- Automatic data distribution and I/O balancing across multiple disk drives
- Superior performance and I/O optimization |
| Specification |
|
| Access time |
| CD-ROM drive average random access time | 120 ms |
| DVD drive average random access time | 140 ms |
| Colour |
| Colour of product | Black |
| Energy management |
| Power requirements | 5V+/-5%; 12V+/-10% |
| Environmental conditions |
| Non-operating relative humidity (non-condensing) | 15 - 90 % |
| Operating relative humidity range | 15 - 80 % |
| Operating temperature range (T-T) | 5 - 50 °C |
| Storage temperature range (T-T) | -40 - 65 °C |
| Optical drive |
| DVD read speed | 16 x |
| Interface | Serial ATA |
| Internal |  |
| Reading speed |
| CD read speed | 48 x |
| System requirements |
| Compatible operating systems | Windows 98SE, ME, 2000(SP4), XP |
| Minimum hard disk space | 100 MB |
| Minimum RAM | 128 MB |
| Minimum system requirements | 1.3 GHz Pentium IV |
Information on this product is provided in good faith, for guidance, by a third party. Customers should check with the manufacturer for a definitive specification before purchase. Saverstore cannot be held liable for any errors or omissions.
