Hi, I've got a Rocket 133 PCI dual channel controller in my dual CPU PIII Xeon box, with 768 Mb of ram, and a pair of 120gb WD HDs hung off the HPT302, each on it's own channel. According to lspci, it's a version 1 of the controller. I just upgraded it to 1.22 of the firmware, but that was a debacle and it's now back down to it's original 1.21 that it shipped with. *grin* 03:06.0 RAID bus controller: Triones Technologies, Inc. HPT302/302N (rev 01) Subsystem: Triones Technologies, Inc. Unknown device 0001 Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 120 (2000ns min, 2000ns max) Interrupt: pin A routed to IRQ 18 Region 0: I/O ports at ecf8 [size=8] Region 1: I/O ports at ecf0 [size=4] Region 2: I/O ports at ece0 [size=8] Region 3: I/O ports at ecd8 [size=4] Region 4: I/O ports at e800 [size=256] Expansion ROM at f9000000 [disabled by cmd] [size=128K] Capabilities: [60] Power Management version 2 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- The drives are identical, and bought at the same time, yet on bootup of 2.6.18-rc5, they show up with different values for CHS and for Max Request Size. HPT302: IDE controller at PCI slot 0000:03:06.0 ACPI: PCI Interrupt 0000:03:06.0[A] -> GSI 18 (level, low) -> IRQ 18 HPT302: chipset revision 1 HPT302: 100% native mode on irq 18 HPT37X: using 33MHz PCI clock ide2: BM-DMA at 0xe800-0xe807, BIOS settings: hde:DMA, hdf:pio HPT37X: using 33MHz PCI clock ide3: BM-DMA at 0xe808-0xe80f, BIOS settings: hdg:DMA, hdh:pio Probing IDE interface ide2... hde: WDC WD1200JB-00CRA1, ATA DISK drive ide2 at 0xecf8-0xecff,0xecf2 on irq 18 Probing IDE interface ide3... hdg: WDC WD1200JB-00EVA0, ATA DISK drive ide3 at 0xece0-0xece7,0xecda on irq 18 Probing IDE interface ide1... hde: max request size: 128KiB hde: 234441648 sectors (120034 MB) w/8192KiB Cache, CHS=65535/16/63, UDMA(100) hde: cache flushes not supported hde: hde1 hdg: max request size: 512KiB hdg: 234441648 sectors (120034 MB) w/8192KiB Cache, CHS=16383/255/63, UDMA(100) hdg: cache flushes supported hdg: hdg1 And even when looking at the details in /sys/block/hd[eg]/queue/max_hw_sectors_kb and /sys/block/hd[eg]/queue/max_sectors_kb I see that the numbers are different. Is this a bug in the chip, or a known issue with the controller? > cat /sys/block/hde/queue/max_sectors_kb 128 > cat /sys/block/hde/queue/max_hw_sectors_kb 128 > cat /sys/block/hdg/queue/max_sectors_kb 512 > cat /sys/block/hdg/queue/max_hw_sectors_kb 1024 Or could it be because the drives have different firmware revisions, as shown by hdparm -I? # hdparm -I /dev/hde /dev/hde: ATA device, with non-removable media Model Number: WDC WD1200JB-00CRA1 Serial Number: WD-WMA8C4365875 Firmware Revision: 17.07W17 Standards: Supported: 5 4 3 Likely used: 6 Configuration: Logical max current cylinders 16383 16383 heads 16 16 sectors/track 63 63 -- CHS current addressable sectors: 16514064 LBA user addressable sectors: 234441648 device size with M = 1024*1024: 114473 MBytes device size with M = 1000*1000: 120034 MBytes (120 GB) Capabilities: LBA, IORDY(can be disabled) bytes avail on r/w long: 40 Standby timer values: spec'd by Standard, with device specific minimum R/W multiple sector transfer: Max = 16 Current = 16 Recommended acoustic management value: 128, current value: 254 DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=120ns IORDY flow control=120ns Commands/features: Enabled Supported: * SMART feature set Security Mode feature set * Power Management feature set * Write cache * Look-ahead * Host Protected Area feature set * WRITE_BUFFER command * READ_BUFFER command * DOWNLOAD_MICROCODE SET_MAX security extension Automatic Acoustic Management feature set * Device Configuration Overlay feature set * SMART error logging * SMART self-test Security: supported not enabled not locked not frozen not expired: security count not supported: enhanced erase HW reset results: CBLID- above Vih Device num = 0 determined by the jumper Checksum: correct # hdparm -I /dev/hdg /dev/hdg: ATA device, with non-removable media Model Number: WDC WD1200JB-00EVA0 Serial Number: WD-WMAEK2844058 Firmware Revision: 15.05R15 Standards: Supported: 6 5 4 Likely used: 6 Configuration: Logical max current cylinders 16383 65535 heads 16 1 sectors/track 63 63 -- CHS current addressable sectors: 4128705 LBA user addressable sectors: 234441648 LBA48 user addressable sectors: 234441648 device size with M = 1024*1024: 114473 MBytes device size with M = 1000*1000: 120034 MBytes (120 GB) Capabilities: LBA, IORDY(can be disabled) Standby timer values: spec'd by Standard, with device specific minimum R/W multiple sector transfer: Max = 16 Current = 16 Recommended acoustic management value: 128, current value: 254 DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=120ns IORDY flow control=120ns Commands/features: Enabled Supported: * SMART feature set Security Mode feature set * Power Management feature set * Write cache * Look-ahead * Host Protected Area feature set * WRITE_BUFFER command * READ_BUFFER command * DOWNLOAD_MICROCODE SET_MAX security extension Automatic Acoustic Management feature set * 48-bit Address feature set * Device Configuration Overlay feature set * Mandatory FLUSH_CACHE * FLUSH_CACHE_EXT * SMART error logging * SMART self-test Security: supported not enabled not locked not frozen not expired: security count not supported: enhanced erase HW reset results: CBLID- above Vih Device num = 0 determined by CSEL Checksum: correct Thanks, John - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html