Messages in this thread | | | Date | Wed, 14 Jan 2004 12:33:21 -0700 | From | Fred Feirtag <> | Subject | HotSwap IDE: PIO possible; DMA not |
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Its ALMOST possible to hotswap IDE drives, which make nice backup devices for raid filesystems. Unfortunately, once the .../ide/pci/*.o chipset-specific module is installed, it becomes wedged with the ide-core module, making further substitutions impossible without a reboot. Although it works fine PIO, see below, it would sure be nice to solve this problem and get it working DMA.
Maybe the "Y" config option for the .../ide/pci/*.o modules should link them into the ide-core.o module, if "M" has been selected for ide-core (formerly ide-mod), because now the "Y" options doesn't link them anywhere, and probably shouldn't even be allowed, once ide-core is "M."
In /etc/modules.conf: ... alias hd ide-disk ###below ide-disk ide-detect ide-core serverworks below ide-disk ide-detect ide-core ...
-bash-2.05b# lsmod Module Size Used by Not tainted sd_mod 12588 0 (autoclean) (unused) 3w-xxxx 40288 0 (unused) scsi_mod 101812 2 [sd_mod 3w-xxxx] -bash-2.05b# fdisk -l /dev/hda (insert 40 GB disk at this time) -bash-2.05b# modprobe hd -bash-2.05b# fdisk -l /dev/hda
Disk /dev/hda: 40.0 GB, 40027029504 bytes 255 heads, 63 sectors/track, 4866 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System /dev/hda1 * 1 16 128488+ 83 Linux /dev/hda2 17 147 1052257+ 82 Linux swap /dev/hda3 148 4866 37905367+ 83 Linux -bash-2.05b# hdparm /dev/hda
/dev/hda: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 4866/255/63, sectors = 78177792, start = 0 -bash-2.05b# lsmod Module Size Used by Not tainted ide-disk 18784 0 ide-detect 680 0 (unused) ide-core 149296 0 [ide-disk ide-detect] sd_mod 12588 2 (autoclean) 3w-xxxx 40288 1 scsi_mod 101812 2 [sd_mod 3w-xxxx] -bash-2.05b# modprobe -r hd -bash-2.05b# fdisk -l /dev/hda (remove 40 GB disk and insert 60 GB disk at this time) -bash-2.05b# modprobe hd -bash-2.05b# fdisk -l
Disk /dev/hda: 61.4 GB, 61492838400 bytes 255 heads, 63 sectors/track, 7476 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System /dev/hda1 1 7476 60050938+ 83 Linux -bash-2.05b# hdparm /dev/hda
/dev/hda: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 7476/255/63, sectors = 120103200, start = 0 -bash-2.05b# hdparm -d 1 /dev/hda
/dev/hda: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) -bash-2.05b# insmod serverworks Using /lib/modules/2.4.24/kernel/drivers/ide/pci/serverworks.o -bash-2.05b# hdparm -d 1 /dev/hda
/dev/hda: setting using_dma to 1 (on) using_dma = 1 (on) -bash-2.05b# lsmod Module Size Used by Not tainted serverworks 10552 1 ide-disk 18784 0 ide-detect 680 0 (unused) ide-core 149296 0 [serverworks ide-disk ide-detect] sd_mod 12588 2 (autoclean) 3w-xxxx 40288 1 scsi_mod 101812 2 [sd_mod 3w-xxxx] -bash-2.05b# rmmod ide-disk ide-detect -bash-2.05b# lsmod Module Size Used by Not tainted serverworks 10552 1 ide-core 149296 0 [serverworks] sd_mod 12588 2 (autoclean) 3w-xxxx 40288 1 scsi_mod 101812 2 [sd_mod 3w-xxxx] -bash-2.05b# rmmod ide-core ide-core: Device or resource busy -bash-2.05b# rmmod serverworks serverworks: Device or resource busy -bash-2.05b#
--Fred
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