On Wed, 2006-08-02 at 16:20 +0900, Tejun Heo wrote: > Roger Oberholtzer wrote: > > On Wed, 2006-08-02 at 04:06 +0900, Tejun Heo wrote: > >> Roger Oberholtzer wrote: > >>> On Wed, 2006-08-02 at 03:45 +0900, Tejun Heo wrote: > >>>> Roger Oberholtzer wrote: > >>>>> On Wed, 2006-08-02 at 00:33 +0900, Tejun Heo wrote: > >>>>>> Roger Oberholtzer wrote: > >>>>>>> Should hotplug work with Intel Corporation 82801GB/GR/GH (ICH7 > >>>>>>> Family) chipset? I am trying kernel 2.6.17.7 > >>>> Ah.. I should have spotted this earlier. 2.6.17.7 doesn't contain > >>>> updated EH and doesn't support any of new features including > >>>> hot/warmplug. Please try 2.6.18-rc3. > >>> OK. But I think there are issues with 2.6.18 generally. But I can try it > >>> to see if this makes this better. > >> If you're uncomfortable with -rcX, you can try libata-tj-stable patch. > >> It contains most of new stuff. > >> > >> http://home-tj.org/files/libata-tj-stable/libata-tj-2.6.17.4-20060710.tar.bz2 > > > > Thanks for that. But it had no noticeable difference. > > Hmmm... That's weird. 'echo - - - > /sys/class/scsi_host/xxx.../scan' > didn't do the right thing? Care to post dmesg? I thought maybe the detection of removal and insertion would work. I did not try the /sys stuff. I will look into that. I guess I can have them be sure there is a disk in each bay when the system is powered up. I will see if this hardware requires this. > > I looked in the bios on my system to see if I could set the SATA disks > > to AHCI mode. I did not see anything like that. I could select to do a > > manual config, in which case I could set things like LBA mode, 32-bit > > I/O (which defaults to off). So if hots wap require AHCI mode, I seem to > > be screwed. It is a phoenix bios for the supermicro computer. > > The chipset might not support ahci mode. > > > Maybe I can try a different SATA card instead of the stuff on the > > motherboard. What do you think is the best one re hots waping? Either > > PCI or PCI-X. > > I primarily use sil3112/4, sil3124/32 and ahci for development. So > those tend to have better support for EH/hotplug stuff. > > >>>>> I bet the driver does the right thing. The trick is knowing what that is > >>>>> supposed to be. And how to use the various commands on files in /sys at > >>>>> the correct time and in the correct order. > >>>> Really, it's not that complicated. > >>> Once you know what it is you need to do. > >> I tried hard to make things just work. If you find things unnecessarily > >> complicated, please let me know. > > > > I have a system with an IDE disk with the OS that is fixed. I also have > > 4 hot swappable SATA disk bays. My use will involve changing the SATA > > disks to do an analysis of the data they contain. There will be 4 disks > > in an analysis set. I need to make it easy for the user to insert and > > remove disks. Rebooting each time is a bad alternative. So, if hot swap > > does not work, I will have to get warm swap working. I think part of the > > confusion I have is how to deal with disks that are mounted. So I need > > to get the steps well defined and make those that require user > > interaction as few as possible. > > As far as libata is concerned, for warmplug, all you need to use are > > echo 1 > /sys/class/scsi_device/xxxx/device/delete > > for removal, and for plugging > > echo - - - > /sys/class/scsi_host/xxxxx/scan > > If you remove device before unmounting, the mounted fs will suffer from > io errors and probably spit quite some error messages, so unmounting > before is a good idea. > > In general, ata_piix doesn't respond very well to runtime device > addition mainly due to problems with port enable. So, if you boot with > empty slot and put new device in there and issue scan, it might or might > not work, but ports which had a device attached on boot seem to always work. > > On any 2.6.17 kernel, without new EH, none of hot/warm plugging works. > Please double check you have the correct kernel. Kernel messages are > very different. It is 2.6.17.7 (current stable from kernel.org), with your suggested patches. -- Roger Oberholtzer OPQ Systems AB Ramböll Sverige AB Kapellgränd 7 P.O. Box 4205 SE-102 65 Stockholm, Sweden Tel: Int +46 8-615 60 20 Fax: Int +46 8-31 42 23 - : 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
