I just want to document some strangeness I see with vinum, in case it
has been noticed before but not identified, or someone knows a cure.
I have a Dell XPS D333 with two Adaptec 2940 Ultra SCSI adapters, one
assigned to fast things and the other to slow things, generally. On
the slow adapter I have two SEAGATE ST43400N disks I placed under
vinum. Below is my config file.
drive a device /dev/da3e
drive b device /dev/da4e
volume vol1
plex org striped 16k
sd length 2777m drive a
sd length 2777m drive b
When I run "iozone -aR" against the volume the entire disks subsystem
seems to take a pause from time to time when the file sizes get large
(>= 32 MB). By this I mean the pause encompasses both disk
controllers. Specifically, if I enter a command in a window, such as
"ls," against a disk on the fast controller and my cwd is on that
controller too, then there is a big delay before the disk is listed,
on the order of 5-10 seconds. My PATH variable does not include any
devices on the slow controller. The window system still runs fine as
does the network.
Strange. Below is my dmesg.
Copyright (c) 1992-1999 FreeBSD Inc.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
FreeBSD 3.3-STABLE #23: Sat Sep 25 08:27:04 PDT 1999
root@btw:/ExternalDisk/FreeBSD-btw-3.x/src/sys/compile/BTW
Timecounter "i8254" frequency 1193182 Hz
Timecounter "TSC" frequency 333346563 Hz
CPU: Pentium II/Xeon/Celeron (333.35-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x650 Stepping = 0
Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
real memory = 402653184 (393216K bytes)
avail memory = 388628480 (379520K bytes)
Preloaded elf kernel "kernel" at 0xc02fa000.
Pentium Pro MTRR support enabled
Probing for devices on PCI bus 0:
chip0: <Intel 82443LX host to PCI bridge> rev 0x03 on pci0.0.0
chip1: <Intel 82443LX PCI-PCI bridge> rev 0x03 on pci0.1.0
chip2: <Intel 82371AB PCI to ISA bridge> rev 0x01 on pci0.7.0
ide_pci0: <Intel PIIX4 Bus-master IDE controller> rev 0x01 on pci0.7.1
chip3: <Intel 82371AB Power management controller> rev 0x01 on pci0.7.3
xl0: <3Com 3c905-TX Fast Etherlink XL> rev 0x00 int a irq 10 on pci0.13.0
xl0: Ethernet address: 00:60:08:b0:3d:a6
xl0: autoneg complete, link status good (half-duplex, 10Mbps)
xl1: <3Com 3c905B-TX Fast Etherlink XL> rev 0x64 int a irq 9 on pci0.14.0
xl1: Ethernet address: 00:50:04:d2:9f:c6
xl1: autoneg complete, link status good (half-duplex, 10Mbps)
ahc0: <Adaptec 2940 Ultra SCSI adapter> rev 0x00 int a irq 3 on pci0.15.0
ahc0: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs
ahc1: <Adaptec 2940 Ultra SCSI adapter> rev 0x00 int a irq 11 on pci0.16.0
ahc1: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs
Probing for devices on PCI bus 1:
vga0: <VGA-compatible display device> rev 0x21 int a irq 9 on pci1.0.0
Probing for devices on the ISA bus:
sc0 on isa
sc0: VGA color <16 virtual consoles, flags=0x0>
atkbdc0 at 0x60-0x6f on motherboard
atkbd0 irq 1 on isa
psm0 irq 12 on isa
psm0: model IntelliMouse, device ID 3
sio0 at 0x3f8-0x3ff irq 4 on isa
sio0: type 16550A
fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
fdc0: FIFO enabled, 8 bytes threshold
fd0: 1.44MB 3.5in
wdc1 at 0x170-0x177 irq 15 on isa
wdc1: unit 0 (atapi): <Seagate STT8000A/5.02>, removable, accel, dma, iordis
wst0: Drive empty, readonly, reverse, qfa, ecc, 512b
wst0: Max speed=600Kb/s, Transfer limit=52 blocks, Buffer size=728 blocks
ppc0 at 0x378 irq 7 on isa
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppi0: <generic parallel i/o> on ppbus 0
vga0 at 0x3b0-0x3df maddr 0xa0000 msize 131072 on isa
npx0 on motherboard
npx0: INT 16 interface
sb0 at 0x220 irq 5 drq 1 on isa
snd0: <SoundBlaster 16 4.13>
sbxvi0 at drq 5 on isa
snd0: <SoundBlaster 16 4.13>
sbmidi0 at 0x330 on isa
snd0: <SoundBlaster MPU-401>
IP packet filtering initialized, divert enabled, rule-based forwarding enabled,
logging limited to 256 packets/entry by default
IP Filter: initialized. Default = pass all, Logging = enabled
Waiting 15 seconds for SCSI devices to settle
sa0 at ahc1 bus 0 target 4 lun 0
sa0: <ARCHIVE ANCDA 2750 28077 -003> Removable Sequential Access SCSI-CCS device
sa0: 3.300MB/s transfers
da1 at ahc0 bus 0 target 1 lun 0
da1: <QUANTUM ATLAS 10K 9WLS UC81> Fixed Direct Access SCSI-3 device
da1: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da1: 8759MB (17938986 512 byte sectors: 255H 63S/T 1116C)
da2 at ahc0 bus 0 target 12 lun 0
da2: <SEAGATE ST410800W 4508> Fixed Direct Access SCSI-2 device
da2: 20.000MB/s transfers (10.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da2: 8669MB (17755614 512 byte sectors: 255H 63S/T 1105C)
cd0 at ahc1 bus 0 target 5 lun 0
cd0: <NEC CD-ROM DRIVE:464 1.05> Removable CD-ROM SCSI-2 device
cd0: 20.000MB/s transfers (20.000MHz, offset 15)
cd0: cd present [326045 x 2048 byte records]
changing root device to da0s1a
da4 at ahc1 bus 0 target 2 lun 0
da4: <SEAGATE ST43400N 1022> Fixed Direct Access SCSI-2 device
da4: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled
da4: 2777MB (5688447 512 byte sectors: 255H 63S/T 354C)
da3 at ahc1 bus 0 target 1 lun 0
da3: <SEAGATE ST43400N 1028> Fixed Direct Access SCSI-2 device
da3: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled
da3: 2777MB (5688447 512 byte sectors: 255H 63S/T 354C)
da0 at ahc0 bus 0 target 0 lun 0
da0: <WDIGTL WDE4360-1807A3 1.80> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit)
da0: 4095MB (8388314 512 byte sectors: 255H 63S/T 522C)
vinum: loaded
vinum: reading configuration from /dev/da4e
vinum: updating configuration from /dev/da3e
xl0: promiscuous mode enabled
vinum: CONFIGURATION OBLITERATED
vinum: drive a is up
vinum: drive b is up
vinum: vol1.p0.s0 is up
vinum: vol1.p0.s1 is up
vinum: vol1.p0 is up
vinum: vol1 is up
vinum: vol1.p0 is up
--
Dennis Glatting
Copyright (c) 1999 Software Munitions
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