Look when compared with the hard disk of general PC, hard disk applied to the servers provides the four following characteristics:

 

Rotational speed of hard disc suited for the servers is fast, it could reach 7200 or 10000 rev, or even higher; In addition , it configure which has a large (generally is 2 MB and 4 MB) write-back cache (is far from date, the existing desktop’s hard disk drive cache is up to 64 MB!); The average access time is shorter; External transfer rate and internal transfer rate are higher, using standard SCSI hard drive such as Ultra Wide SCSI, Ultra2 Wide SCSI, Ultra160 SCSI, Ultra320 SCSI and so forth, the information-transfer rate can reach 40 MB and 80 MB, 160 MB, 320 MB per second.

 

Because of the server’s hard drive almost works well with a day with no break, it sustains a lot of workloads. And so the hard disc manufacturer all adopts a unique advanced technology to ensure the safety on the data. Avoiding the unexpected costs, the server hard drive is mostly able to withstand the impact on the 300 g to 1000 g.

Nearly all servers utilize SCSI/SAS hard dick with large-data throughput, low-occupancy of CPU (even though the CPU occupancy of desktop SATA hard drive is low, but obviously not on a similar class with SAS harddrive). Using SCSI disk drive must over the SCSI connector, some servers motherboard have integrated SCSI connectors, some possess a dedicated SCSI interface card, a SCSI interface card can select seven SCSI device, this really is can't be matched through the IDE connector (an IDE connector could only extend two channels, and so they interfere each other seriously).

 

Hot Swap can be a harddrive installation of some supported servers, it could possibly retrieve or insert a disk if your server doesn't stop, and main system automatically recognizes the advance of disk drive. Fractional laser treatments is critical towards 24 hours non-stop running servers. Certainly, SATA hard drive in addition have this technology, but for the non-critical business, restart the server is apparently cost-effective than hot swapping (hot plug includes a risk of loss data).