Does anyone have time for a user question? Tell me to push off if this is not the right list. I have a system (SMP Xeon), with 4x Fast 10000RPM 72G SATA WD Raptor drives and 8x 7200RPM 250G SATA Hitachi. -The 250Gs are a RAID5 stripe on an 8 port PCI-X Marvell (sata_mv) controller -The 72Gs are spread across the motherboard ports, 2 I believe served by the Intel Southbridge and 2 by an on-board Promise SATA controller These 4 disks are mirrored across controllers. The 72g drives perform surprisingly badly on the Promise controller. Await seems particularly high, (112 Promise vs 6 ata-piix), and it often reports that the mirrors on the ata-piix are 25% loaded as a result. Below is an iostat -X during a resync of all the arrays, but I get the same results doing any intensive IO on these stripes. Could anyone point me towards what could be wrong or if this is to be expected? Is there anything I can Tune to help the Promise controller out? evice: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 213.27 0.00 49.90 0.00 33501.00 671.36 0.28 5.66 4.77 23.79 sdb 0.00 215.47 0.00 50.30 0.00 33826.75 672.51 0.29 5.85 4.90 24.63 sdc 220.66 0.20 41.12 0.60 33596.81 6.39 805.51 4.70 112.72 23.89 99.64 sdd 222.85 1.20 41.22 0.40 33711.78 12.77 810.36 4.69 112.56 23.96 99.72 sde 4222.75 0.60 90.22 0.50 34518.16 8.78 380.59 2.52 27.89 10.94 99.28 sdf 4235.23 0.00 76.25 0.00 34352.89 0.00 450.54 3.03 39.69 13.01 99.20 sdg 4213.67 0.00 98.00 0.00 34424.75 0.00 351.26 2.36 24.06 10.07 98.64 sdh 4224.15 2.20 90.62 1.20 34451.90 27.15 375.52 2.69 29.30 10.87 99.80 sdi 4222.36 0.00 89.12 0.00 34352.89 0.00 385.46 2.63 29.46 11.10 98.96 sdj 4217.47 0.00 94.01 0.00 34352.89 0.00 365.41 2.51 26.62 10.54 99.08 sdk 4219.26 0.00 92.32 0.10 34353.69 0.80 371.74 2.53 27.25 10.75 99.32 sdl 4232.53 1.60 81.04 0.80 34372.06 19.16 420.24 2.98 36.35 12.20 99.88 md11 0.00 0.00 0.00 0.80 0.00 6.39 8.00 0.00 0.00 0.00 0.00 md3 0.00 0.00 0.00 3.09 0.00 24.75 8.00 0.00 0.00 0.00 0.00 md12 0.00 0.00 0.00 1.60 0.00 12.77 8.00 0.00 0.00 0.00 0.00 md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-3 0.00 0.00 0.00 2.40 0.00 19.16 8.00 0.07 28.83 21.83 5.23 Some dmesg output, (all disks are SATA even though I see ATA messages) ata_piix 0000:00:1f.2: version 2.00ac7 ata_piix 0000:00:1f.2: MAP [ P0 -- P1 -- ] ata1: SATA max UDMA/133 cmd 0xC800 ctl 0xCC02 bmdma 0xD800 irq 16 ata2: SATA max UDMA/133 cmd 0xD000 ctl 0xD402 bmdma 0xD808 irq 16 scsi0 : ata_piix ata1.00: ATA-6, max UDMA/133, 145226112 sectors: LBA48 ata1.00: ata1: dev 0 multi count 16 ata1.00: configured for UDMA/133 scsi1 : ata_piixata2.00: ATA-6, max UDMA/133, 145226112 sectors: LBA48 ata2.00: ata2: dev 0 multi count 16 ata2.00: configured for UDMA/133 sata_promise 0000:04:04.0: version 1.05 ata3: SATA max UDMA/133 cmd 0xF881E200 ctl 0xF881E238 bmdma 0x0 irq 19 ata4: SATA max UDMA/133 cmd 0xF881E280 ctl 0xF881E2B8 bmdma 0x0 irq 19 scsi2 : sata_promise ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300) ata3.00: ATA-6, max UDMA/133, 145226112 sectors: LBA48 ata3.00: ata3: dev 0 multi count 0ata3.00: configured for UDMA/133 scsi3 : sata_promise ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300) ata4.00: ATA-6, max UDMA/133, 145226112 sectors: LBA48 ata4.00: ata4: dev 0 multi count 0 ata4.00: configured for UDMA/133 Rgds Scott - 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
