Please cc me if possible, thanks. I've built a new machine with Intel Desktop Board DQ35JO, Intel E2160 CPU, and 8 x Seagate ST3500320AS 500MB SATA harddisks. 6 of the 8 harddisks are connected to the motherboard's SATA ports, while the remaining 2 are connected to a 2 ports PCI-E card with sil24. kernel is 2.6.24.5, have tried fedora kernel 2.6.23.1-42 and 2.6.24.4-64, all give the same result. 2.6.25 doesn't help. I have another production server running 2.6.22.5, same harddisk connected to ICH8R, does not have the transfer rate problem. sda,b,c .... to sdf are running ahci driver, sdg and sdh are running sil24 driver hdparm -t /dev/sd{a-f} give around 45-46MB/sec [root@localhost log]# hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 140 MB in 3.02 seconds = 46.42 MB/sec hdparm -t /dev/sdg and sdh give over 105MB/sec [root@localhost log]# hdparm -t /dev/sdg /dev/sdg: Timing buffered disk reads: 316 MB in 3.01 seconds = 105.13 MB/sec had updated the motherboard to latest BIOS, no change in hdparm test b4/after update. dd to /dev/null from sda,sdb ... also show the same result, around 4xMB/s, dd from sdg, sdh give over 100MB/s hdparm -i: [root@localhost boot]# hdparm -i /dev/sda /dev/sda: Model=ST3500320AS , FwRev=SD15 , SerialNo= 9QM2Q7F4 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4 BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=?16? CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 AdvancedPM=no WriteCache=enabled Drive conforms to: unknown: ATA/ATAPI-4,5,6,7 * signifies the current active mode [root@localhost boot]# hdparm -i /dev/sdb /dev/sdb: Model=ST3500320AS , FwRev=SD15 , SerialNo= 9QM2H18H Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4 BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=?16? CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 AdvancedPM=no WriteCache=enabled Drive conforms to: unknown: ATA/ATAPI-4,5,6,7 * signifies the current active mode ........................... [root@localhost boot]# hdparm -i /dev/sdg /dev/sdg: Model=ST3500320AS , FwRev=SD15 , SerialNo= 9QM2LE0C Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4 BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=?16? CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 AdvancedPM=no WriteCache=enabled Drive conforms to: unknown: ATA/ATAPI-4,5,6,7 * signifies the current active mode attached dmesg Since I'll run a 8x500GB raid5 on this machine, slow transfer rate of AHCI driven harddisks will slow down the create / check / resync ... etc of the whole array. Please help, thank you very much Regards, Kyle
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