Public bug reported:
Binary package hint: linux-image-2.6.24-16-generic
My system: Thinkpad R51e with an hdd in ultrabay slot ( 2 disks are in
raid 0 array)
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System
-> About Ubuntu.
Description: Ubuntu 8.04
Release: 8.04
2) The version of the package you are using, via 'apt-cache policy
packagename' or by checking in Synaptic.
kernel 2.6.24 general (15 and 16)
3) What you expected to happen
4) What happened instead
The reading speed "hdparm -tT" on /dev/sda (internal pata disk) gives 30-40 mb/s
but the same command for /dev/sdb (a disk in an ultrabay enclosure) shows
reading speed as low as 1 mb/s.
Due to the fact that these 2 drives are in raid0 the system is very slow and
unresponsive during I/O operations.
There is no problem when I boot 2.6.22-14-generic. hdparm -tT gives 30-40mb/s
for both hda and hdc;
hdparm -tT /dev/md0 is around 70mb/s. One thing to note is that 2.6.22 assigns
hdX to drives while the newer
kernel uses sdX. Is there a new module responsible for these drives?
There are no errors in "dmesg | grep sdb" when I boot 2.6.24 kernel. At
least I see no suspicious messages.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: disk thinkpad ultrabay
--
slow access to ultrabay (thinkpad)
https://bugs.launchpad.net/bugs/221506
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