This is mostly a note for myself.
In 3.2.4, it is said that “for a special file, this i-node contains the major device number, and the minor device number”. This is different from what we know for normal files, where the i-node contains file access time, etc.
It is not effecient to hold one i-node structure for […]
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Posted 13 September 2006
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minix
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I was reading about disk IO this morning. In chapter 3.1.3, it is said that the disk need to be formatted with the number interlaving, so that we’ll need less disk circlings to get the data we need.
My question is, all these is based on one assumption: that the buffer on the disk controller can […]
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Posted 07 September 2006
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minix
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before I started:
root@mybox:data# fdisk -s /dev/da0
/dev/da0: 91517 cyl 255 hd 63 sec
Part Start Size Type Flags
1: 63 980141652 0xa5 0×80
root@mybox:data# disklabel -A /dev/da0s1
# /dev/da0s1:
type: unknown
disk: amnesiac
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 61010
sectors/unit: 980141652
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # milliseconds
track-to-track […]
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Posted 30 October 2005
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freebsd
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root@mybox:data# fdisk -s /dev/da0 /dev/da0: 61011 cyl 255 hd 63 sec Part Start Size Type Flags
1: 63 980141652 0xa5 0×80
root@mybox:data# disklabel -A /dev/da0s1 # /dev/da0s1: type: unknown disk: amnesiac label: […]
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Posted 29 October 2005
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freebsd
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on the system disk, if I turn the write cache off (sysctl hw.ata.wc, by setting in /boot/loader.conf). the dd command will take 77.78 seconds, well when turning it on (the default), it will take only 10.93 seconds.
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:((((((
The disk was full when I was downloading something last night. And I didn’t notice that this morning. The nearest backup I found was on 3/19. I lost 3 months data of that :(((((
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Posted 21 June 2005
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misc
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mount_cd9660 -s 0 /dev/acd0 /cdrom
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Posted 05 November 2004
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freebsd
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