RE: sata slave on intel ICH7
I thought SATA did away with the master/slave ugliness of PATA. no. SATA and PATA both present the same ATA interface to the system, the only difference is how the chips are connected to the hard drive. The ATA interface is backwards compatible all the way back to the original IBM x86 BIOS that supported only 1 MFM controller with a maximum of 2 drives on it that used the Task File interface. When the PC architecture went to IDE drives from MFM, they didn't want to rewrite their motherboard BIOS code because MS-DOS was what everyone ran, and DOS depended on the BIOS code for accessing the disks. This is why today you can still boot MS-DOS on a SATA motherboard. All of the newer stuff like DMA transfers and such, are a superset laid on top of the original IDE interface, but that software interface is still present in ATA. If you don't like it, buy a SATA RAID card. It would be possible for a SATA chip to be designed to use separate controllers and unique busses to each SATA disk. For example that is how the HP Proliant servers work, every SATA port is a Master. Each SATA port comes up as a separate atapci, ie atapci0, atapci1, atapci2, etc. And, although each atapci has 2 channels on it, the second channel has no port on it and cannot have anything plugged into it. Your -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Dane Miller Sent: Thursday, March 06, 2008 4:12 PM To: freebsd-questions@freebsd.org Subject: Re: sata slave on intel ICH7 Anyone have thoughts on this? If I'm missing salient details or posting to the wrong list, please point me in the right direction. On Wed, 2008-03-05 at 13:54 -0800, Dane Miller wrote: Hi, FreeBSD 6.3-RELEASE detects one of my three SATA disks as ata2-slave. I thought SATA did away with the master/slave ugliness of PATA. Thinking maybe this was misleading output from FreeBSD, I did some concurrent writes using dd. Sure enough, I see poor performance on concurrent writes to ad4 and ad5 (ata2-master and ata2-slave), while I see good performance on concurrent writes to ad4 and ad6 (ata2-master, ata3-master). I can provide more details on the write tests I performed, but I'm more interested in *why* FreeBSD detects one of my SATA disks as a slave... Here are some details: 6.3-RELEASE FreeBSD 6.3-RELEASE #0 i386 Motherboard: Intel S3000AH BIOS: SATA Mode is set to Enhanced (as opposed to Legacy) # atacontrol list ATA channel 0: Master: no device present Slave: no device present ATA channel 1: Master: no device present Slave: no device present ATA channel 2: Master: ad4 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II Slave: ad5 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II ATA channel 3: Master: ad6 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II Slave: no device present # grep -i ata /var/run/dmesg.boot atapci0: Intel ICH7 UDMA100 controller port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x30b0-0x30bf irq 18 at device 31.1 on pci0 ata0: ATA channel 0 on atapci0 ata1: ATA channel 1 on atapci0 atapci1: Intel ICH7 SATA300 controller port 0x30c8-0x30cf,0x30e4-0x30e7,0x30c0-0x30c7,0x30e0-0x30e3,0x30a0-0x30af mem 0x8820-0x882003ff irq 19 at device 31.2 on pci0 ata2: ATA channel 0 on atapci1 ata3: ATA channel 1 on atapci1 ad4: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata2-master SATA150 ad5: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata2-slave SATA150 ad6: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata3-master SATA150 Any guidance on this would be greatly appreciated. Thanks, Dane ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sata slave on intel ICH7
Anyone have thoughts on this? If I'm missing salient details or posting to the wrong list, please point me in the right direction. On Wed, 2008-03-05 at 13:54 -0800, Dane Miller wrote: Hi, FreeBSD 6.3-RELEASE detects one of my three SATA disks as ata2-slave. I thought SATA did away with the master/slave ugliness of PATA. Thinking maybe this was misleading output from FreeBSD, I did some concurrent writes using dd. Sure enough, I see poor performance on concurrent writes to ad4 and ad5 (ata2-master and ata2-slave), while I see good performance on concurrent writes to ad4 and ad6 (ata2-master, ata3-master). I can provide more details on the write tests I performed, but I'm more interested in *why* FreeBSD detects one of my SATA disks as a slave... Here are some details: 6.3-RELEASE FreeBSD 6.3-RELEASE #0 i386 Motherboard: Intel S3000AH BIOS: SATA Mode is set to Enhanced (as opposed to Legacy) # atacontrol list ATA channel 0: Master: no device present Slave: no device present ATA channel 1: Master: no device present Slave: no device present ATA channel 2: Master: ad4 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II Slave: ad5 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II ATA channel 3: Master: ad6 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II Slave: no device present # grep -i ata /var/run/dmesg.boot atapci0: Intel ICH7 UDMA100 controller port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x30b0-0x30bf irq 18 at device 31.1 on pci0 ata0: ATA channel 0 on atapci0 ata1: ATA channel 1 on atapci0 atapci1: Intel ICH7 SATA300 controller port 0x30c8-0x30cf,0x30e4-0x30e7,0x30c0-0x30c7,0x30e0-0x30e3,0x30a0-0x30af mem 0x8820-0x882003ff irq 19 at device 31.2 on pci0 ata2: ATA channel 0 on atapci1 ata3: ATA channel 1 on atapci1 ad4: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata2-master SATA150 ad5: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata2-slave SATA150 ad6: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata3-master SATA150 Any guidance on this would be greatly appreciated. Thanks, Dane ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
sata slave on intel ICH7
Hi, FreeBSD 6.3-RELEASE detects one of my three SATA disks as ata2-slave. I thought SATA did away with the master/slave ugliness of PATA. Thinking maybe this was misleading output from FreeBSD, I did some concurrent writes using dd. Sure enough, I see poor performance on concurrent writes to ad4 and ad5 (ata2-master and ata2-slave), while I see good performance on concurrent writes to ad4 and ad6 (ata2-master, ata3-master). I can provide more details on the write tests I performed, but I'm more interested in *why* FreeBSD detects one of my SATA disks as a slave... Here are some details: 6.3-RELEASE FreeBSD 6.3-RELEASE #0 i386 Motherboard: Intel S3000AH BIOS: SATA Mode is set to Enhanced (as opposed to Legacy) # atacontrol list ATA channel 0: Master: no device present Slave: no device present ATA channel 1: Master: no device present Slave: no device present ATA channel 2: Master: ad4 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II Slave: ad5 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II ATA channel 3: Master: ad6 WDC WD2500KS-00MJB0/02.01C03 Serial ATA II Slave: no device present # grep -i ata /var/run/dmesg.boot atapci0: Intel ICH7 UDMA100 controller port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x30b0-0x30bf irq 18 at device 31.1 on pci0 ata0: ATA channel 0 on atapci0 ata1: ATA channel 1 on atapci0 atapci1: Intel ICH7 SATA300 controller port 0x30c8-0x30cf,0x30e4-0x30e7,0x30c0-0x30c7,0x30e0-0x30e3,0x30a0-0x30af mem 0x8820-0x882003ff irq 19 at device 31.2 on pci0 ata2: ATA channel 0 on atapci1 ata3: ATA channel 1 on atapci1 ad4: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata2-master SATA150 ad5: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata2-slave SATA150 ad6: 238475MB WDC WD2500KS-00MJB0 02.01C03 at ata3-master SATA150 Any guidance on this would be greatly appreciated. Thanks, Dane -- Dane Miller Systems Administrator Greatschools, Inc http://www.greatschools.net ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]