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D2D2T, VTL, Near-line Backup
One major advantage of SAS and SATA-based storage is it saves big money from business users in terms of dollar-per-gigabyte perspective. A mainstream SAS or SATA RAID can go as low as $3 per GB, which is roughly 1/5 of SCSI-based storage. Tape storage $/GB falls into the range of 20 ~ 50. Along with other advantages such as 10 times of throughput, random access in nature, expandable with SAS expansion port, and minimal restore time, it's easy to understand the trend that SAS and SATA-based storage is replacing tape as the backup infrastructure. In the figure at the right.
Backup server is copying data from application servers to iSCSI disk arrays, and then moving to iSCSI tape library based on company backup policy. Qsan P series can be the iSCSI disk array and even the iSCSI tape library with Virtual Tape Library support in the future. Given this tiered-storage infrastructure, IT department can do daily backup by fraction of time required before and restore data from iSCSI storage most of the time without digging into tape. With additional VTL support, Qsan P series appears as an ordinary tape library to backup server only faster and cheaper. It is the ideal solution for either D2D2T or VTL in medium businesses or branch office in enterprises.
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