bad statistics from /proc for hard drives
Hello all,
I am using Debian 3.0 on i386 with a 2.4.20 kernel. I
have 3 hard drives installed on this machine, 2 on the
primary channel and one on the secondary channel. The
boot drive is an IBM and the other 2 are Maxtors (no
religious wars please). I get bad statistics from sar
and iostat, which presumably means /proc is not
reading things right.
It shows 100% (or thereabouts) busy and minutes-long
latencies for a system that is not currently being
used at all. Even more unusual, is that these stats
are for the drive itself, not the partitions that
belong to it.
The machine is fast and responds quickly. I have run
diagnostics from both IBM and Maxtor and all 3 drives
have passed with flying colors. I have even run
several benchmarks on the drives and all 3 drives are
essentially dead-even in performance.
Relevant info is below, THANKS all!
hda: IBM-DAQA-33240, ATA DISK drive
hdb: Maxtor 2R015H1, ATA DISK drive
hdd: Maxtor 91024U3, ATA DISK drive
and 2 cd drives
ignore the CMD-0680 below, that's just for the cd-rw,
and these symptoms happened way before the controller
was installed:
#lspci
0:00.0 Host bridge: Advanced Micro Devices [AMD]
AMD-760 [Irongate] System Controller (rev 12)
00:01.0 PCI bridge: Advanced Micro Devices [AMD]
AMD-760 [Irongate] AGP Bridge
00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686
[Apollo Super South] (rev 40)
00:07.1 IDE interface: VIA Technologies, Inc. Bus
Master IDE (rev 06)
00:07.4 SMBus: VIA Technologies, Inc. VT82C686 [Apollo
Super ACPI] (rev 40)
00:0a.0 Unknown mass storage controller: CMD
Technology Inc: Unknown device 0680 (rev 02)
00:0c.0 Ethernet controller: 3Com Corporation 3c905B
100BaseTX [Cyclone] (rev 30)
01:05.0 VGA compatible controller: nVidia Corporation
NV15 Bladerunner (GeForce2 Ultra) (rev a4)
a typical sar -D line on the idle system would read:
10:50:01 hdd (22-64) 100% 0.00 0.0 0.16
7.4 7155.97 6316.95 ms
hdd1 0.00 0.0 0.16
7.4
hda (3-0) 0% 0.01 12.0 0.16
11.5 12.07 5.64 ms
hda2 0.01 12.0 0.16
11.5
hdb (3-64) 100% 0.02 40.8 0.91
9.5 7159.68 1069.16 ms
hdb2 0.02 40.8 0.91
9.5
and iostat -x
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
rkB/s wkB/s avgrq-sz avgqu-sz await svctm
%util
/dev/hdc 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 21474786.48 0.00 0.00
100.00
/dev/hdd 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 21474826.48 0.00 0.00
100.00
/dev/hdd1 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00
0.00
/dev/hda 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00
0.00
/dev/hda1 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00
0.00
/dev/hda2 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00
0.00
/dev/hdb 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 21474826.48 0.00 0.00
100.00
/dev/hdb2 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00
0.00
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