Even better than the four-disk NAS I mentioned earlier is the following: Promise UltraTrak RM8000. This is a so-called SCSI-to-IDE RAID system. Basically it's a RAID setup of eight IDE disks, using a hardware RAID engine, that's connected to (in this case) the PostgreSQL server via a SCSI Ultra160 interface (!). So the server won't know any better than that there's a SCSI disk attached, but in reality it's a IDE RAID setup. It supports RAID levels 0, 1, 0+1, 5, 50 and JBOD and supports hot-swapping.
Such a NAS config would cost around EUR 3700 (ex. VAT), using 8x40 Gb IDE disks (7200rpm). A SCSI RAID-10 setup using 6x18Gb (15000rpm) disks would cost around EUR 6000 (ex. VAT) so it's a big difference... Does anyone have experience with this NAS device or other "SCSI-to-IDE" RAID systems? Are they OK in terms of performance and reliability? Kind regards, Alexander. ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
