From: Fred Feirtag <ffeirtag@integrityns.com>
To: linux-kernel@vger.kernel.org
Subject: HotSwap IDE: PIO possible; DMA not
Date: Wed, 14 Jan 2004 12:33:21 -0700 [thread overview]
Message-ID: <40059981.5000807@integrityns.com> (raw)
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
reply other threads:[~2004-01-14 19:42 UTC|newest]
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