What is pio(in /var/log/messages)? 1

[svar]

Anyone know what pio stands for ?
(see 7 lines down the /var/log/messages). I posted another message on disk crash (3 -4 messages below this one) where I have a case of an apparent crash on one disk holding one linux system while
another one works ok, but BIOS does not see the crashed HD. In the /var/log/messages form the
remaining one I see had pio, hdb pio. Does this mean
the disk is recognized or what???
Thanks, svar



Jul 8 00:40:38 linux syslogd 1.3-3: restart.
Jul 8 00:40:39 linux kernel: klogd 1.3-3, log source = /proc/kmsg started.
Jul 8 00:40:39 linux kernel: Inspecting /boot/System.map
Jul 8 00:40:39 linux kernel: Symbol table has incorrect version number.
Jul 8 00:40:39 linux kernel: Cannot find map file.
Jul 8 00:40:39 linux kernel: Loaded 585 symbols from 26 modules.
--HERE!Jul 8 00:40:39 linux kernel: : hdaio, hdbio
Jul 8 00:40:39 linux kernel: ide1: BM-DMA at 0xb808-0xb80f, BIOS settings: hdcMA, hddio
Jul 8 00:40:39 linux kernel: hda: WDC WD102AA, ATA DISK drive
Jul 8 00:40:39 linux kernel: hdc: CD-540E, ATAPI CD/DVD-ROM drive
Jul 8 00:40:39 linux kernel: ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Jul 8 00:40:39 linux kernel: ide1 at 0x170-0x177,0x376 on irq 15
Jul 8 00:40:39 linux kernel: blk: queue c031ece4, I/O limit 4095Mb (mask 0xffffffff)
Jul 8 00:40:39 linux kernel: hda: safely enabled flush
Jul 8 00:40:39 linux kernel: hda: 20044080 sectors (10263 MB) w/2048KiB Cache, CHS=19885/16/63
Jul 8 00:40:39 linux kernel: hdc: no flushcache support
Jul 8 00:40:39 linux kernel: hdc: ATAPI 40X CD-ROM drive, 128kB Cache
Jul 8 00:40:39 linux kernel: Uniform CD-ROM driver Revision: 3.12
Jul 8 00:40:39 linux kernel: ide-floppy driver 0.99
Jul 8 00:40:39 linux kernel: Partition check:
Jul 8 00:40:39 linux kernel: hda: [PTBL] [1247/255/63] hda1 hda2 hda3 hda4
Jul 8 00:40:39 linux kernel: Floppy drive(s): fd0 is 1.44M
Jul 8 00:40:39 linux kernel: FDC 0 is a post-1991 82077
Jul 8 00:40:39 linux kernel: loop: loaded (max 16 devices)
Jul 8 00:40:39 linux kernel: Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994
Jul 8 00:40:39 linux kernel: Linux port (c) 1998 Building Number Three Ltd & Jan "Yenya" Kasprzak.
Jul 8 00:40:39 linux kernel: ide-floppy driver 0.99
Jul 8 00:40:39 linux kernel: SCSI subsystem driver Revision: 1.00
Jul 8 00:40:39 linux kernel: request_module[scsi_hostadapter]: Root fs not mounted
Jul 8 00:40:39 linux kernel: request_module[scsi_hostadapter]: Root fs not mounted
Jul 8 00:40:39 linux kernel: md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
Jul 8 00:40:39 linux kernel: md: Autodetecting RAID arrays.

 

[tarn]

Programmed I/O (PIO) Modes

The oldest method of transferring data over the IDE/ATA interface is through the use of programmed I/O. This is a technique whereby the system CPU and support hardware directly control the transfer of data between the system and the hard disk. There are several different speeds of programmed I/O, which are of course called programmed I/O modes, or more commonly, PIO modes.

See more at ->

http://www.pcguide.com/ref/hdd/if/ide/modes_PIO.htm

QUOTE PIO is just not up to handling modern drives, which use Ultra DMA to keep the load on the CPU down and to allow access to Ultra DMA's much higher performance. Support for PIO modes is still universal on almost all systems and drives made since the mid-1990s, for backwards compatibility. It is used, for example, as a "last resort" when driver or software issues cause problems with Ultra DMA accesses.

I hope this helps a bit?
Laurie.

 

[svar]

Thanks. I guess it is possible that there is a problem with the power feeder-maybe it can no longer handle 2 drives? I should check that too.
Thanks anyway for a very clear answer
svar