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(link) LSI Logic MegaRAID SATA 150-4 (four ports) and 150-6 (six ports) Serial ATA RAID Host Adapters — real hardware RAID. Work with 2.4.x kernel's megaraid2 driver (same one as for SCSI). Cards use an Intel GC80302 dedicated I/O processor. This chipset, under its former AMI brand name, has had a long and excellent history with SCSI gear. Optional battery backup unit is available for the model 150-6 card's cache, for more reliable operation in the event of power loss, etc. These cards should not be confused with the low-end LSI Logic MegaRaid SATA 150-2 card (which please see).
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(link) LSI Logic MegaRAID SATA 150-2 Serial ATA RAID Host Adapter PCI card — fakeraid. This turns to to be a Silicon Image 3112-variant. Reports suggest that Linux's open-source SiI 3112 driver sets from Linux work with this card.
An i386 binary (ataraid?) subdriver (megaide) for this fakeraid ("IDEal RAID") scheme can be retrieved from Steve Hardy's Web site, from
http://pub.datux.nl/linux/drivers/proliant/, or from LSI Logic. The driver is a GPLed wrapper around proprietary library megaide_lib.o. I'd recommend using (instead) Linux's own open-source "md" software-RAID driver, unless/until LSI Logic (like HighPoint, Nvidia, Promise, and VIA) gets a clue about open source.
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(link) LSI Logic MegaRAID SATA 300-4X 4-port and 300-8X 8-port SATA-II PCI-X cards — real hardware RAID. Uses a Marvell 88SX6081 chip. Compatible with Linux's megaraid2 driver.