> > I wander if the SATA feature of NCQ would speed the disk I/O up but > > there is likely no easy way to upgrade CentOS 4.x to do that. > > AFAICT CentOS 4.5 kernel was originally based on 2.6.9. A long time > has passed since then and the 2.6.21/2.6.22 kernels where the new > libata based disk subsystem (starting with the nice features you are > looking for) was first included in the kernel. > > The upgrade should still be doable (depending on your skills). > > The most significant change you might experience is the new udev > device structure which replaced devfs at around ~2.6.12 IIRC. > Anyway. I'd give it a shot if you have some minutes of downtime. > Well, if you update... go to the latest stable tree.
This is what I show. Linux version 2.6.9-67.0.4.ELsmp ([EMAIL PROTECTED]) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-9)) #1 SMP Sun Feb 3 07:08:57 EST 2008 Also, libata version 2.00 loaded. sata_nv 0000:00:0e.0: version 3.2 ACPI: PCI Interrupt 0000:00:0e.0[A] -> GSI 20 (level, low) -> IRQ 201 PCI: Setting latency timer of device 0000:00:0e.0 to 64 ata1: SATA max UDMA/133 cmd 0x9F0 ctl 0xBF2 bmdma 0xE000 irq 201 ata2: SATA max UDMA/133 cmd 0x970 ctl 0xB72 bmdma 0xE008 irq 201 scsi0 : sata_nv ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata1.00: ATA-7, max UDMA/133, 976773168 sectors: LBA48 NCQ (depth 0/32) ata1.00: ata1: dev 0 multi count 1 ata1.00: configured for UDMA/133 scsi1 : sata_nv ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata2.00: ATA-8, max UDMA7, 781422768 sectors: LBA48 NCQ (depth 0/32) ata2.00: ata2: dev 0 multi count 1 ata2.00: configured for UDMA/133 Using cfq io scheduler Vendor: ATA Model: ST3500630AS Rev: 3.AA Type: Direct-Access ANSI SCSI revision: 05 SCSI device sda: 976773168 512-byte hdwr sectors (500108 MB) SCSI device sda: drive cache: write back SCSI device sda: 976773168 512-byte hdwr sectors (500108 MB) SCSI device sda: drive cache: write back sda: sda1 sda2 Attached scsi disk sda at scsi0, channel 0, id 0, lun 0 Vendor: ATA Model: SAMSUNG HD403LJ Rev: CT10 Type: Direct-Access ANSI SCSI revision: 05 SCSI device sdb: 781422768 512-byte hdwr sectors (400088 MB) SCSI device sdb: drive cache: write back SCSI device sdb: 781422768 512-byte hdwr sectors (400088 MB) SCSI device sdb: drive cache: write back sdb: sdb1 Matt -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
