Saya pasang HDD eksternal ke laptop saya. Saya mencoba mencari tahu informasinya
$ udevadm info -a -n /dev/sdb
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0/10:0:0:0/block/sdb':
KERNEL=="sdb"
SUBSYSTEM=="block"
DRIVER==""
ATTR{range}=="16"
ATTR{ext_range}=="256"
ATTR{removable}=="0"
ATTR{ro}=="0"
ATTR{size}=="312581808"
ATTR{alignment_offset}=="0"
ATTR{discard_alignment}=="0"
ATTR{capability}=="50"
ATTR{stat}==" 322 11207 13259 2196 2 0 16 0 0 1524 2196"
ATTR{inflight}==" 0 0"
ATTR{events}==""
ATTR{events_async}==""
ATTR{events_poll_msecs}=="-1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0/10:0:0:0':
KERNELS=="10:0:0:0"
SUBSYSTEMS=="scsi"
DRIVERS=="sd"
ATTRS{device_blocked}=="0"
ATTRS{type}=="0"
ATTRS{scsi_level}=="0"
ATTRS{vendor}=="USB 2.0 "
ATTRS{model}=="Storage Device "
ATTRS{rev}=="0100"
ATTRS{state}=="running"
ATTRS{timeout}=="30"
ATTRS{iocounterbits}=="32"
ATTRS{iorequest_cnt}=="0x165"
ATTRS{iodone_cnt}=="0x165"
ATTRS{ioerr_cnt}=="0x2"
ATTRS{evt_media_change}=="0"
ATTRS{dh_state}=="detached"
ATTRS{queue_depth}=="1"
ATTRS{queue_type}=="none"
ATTRS{max_sectors}=="240"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0':
KERNELS=="target10:0:0"
SUBSYSTEMS=="scsi"
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10':
KERNELS=="host10"
SUBSYSTEMS=="scsi"
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0':
KERNELS=="2-1:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="usb-storage"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bNumEndpoints}=="02"
ATTRS{bInterfaceClass}=="08"
ATTRS{bInterfaceSubClass}=="06"
ATTRS{bInterfaceProtocol}=="50"
ATTRS{supports_autosuspend}=="1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1':
KERNELS=="2-1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="c0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="1076"
ATTRS{idVendor}=="0402"
ATTRS{idProduct}=="5621"
ATTRS{bcdDevice}=="0103"
ATTRS{bDeviceClass}=="00"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="480"
ATTRS{busnum}=="2"
ATTRS{devnum}=="8"
ATTRS{devpath}=="1"
ATTRS{product}=="USB 2.0 Storage Device"
ATTRS{serial}=="00042222200000064007"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2':
KERNELS=="usb2"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="382"
ATTRS{idVendor}=="1d6b"
ATTRS{idProduct}=="0002"
ATTRS{bcdDevice}=="0302"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="480"
ATTRS{busnum}=="2"
ATTRS{devnum}=="1"
ATTRS{devpath}=="0"
ATTRS{version}==" 2.00"
ATTRS{maxchild}=="6"
ATTRS{quirks}=="0x0"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Linux 3.2.0-27-generic-pae ehci_hcd"
ATTRS{product}=="EHCI Host Controller"
ATTRS{serial}=="0000:00:1d.7"
ATTRS{authorized_default}=="1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7':
KERNELS=="0000:00:1d.7"
SUBSYSTEMS=="pci"
DRIVERS=="ehci_hcd"
ATTRS{vendor}=="0x8086"
ATTRS{device}=="0x293a"
ATTRS{subsystem_vendor}=="0x17aa"
ATTRS{subsystem_device}=="0x20f1"
ATTRS{class}=="0x0c0320"
ATTRS{irq}=="19"
ATTRS{local_cpus}=="ff"
ATTRS{local_cpulist}=="0-7"
ATTRS{dma_mask_bits}=="32"
ATTRS{consistent_dma_mask_bits}=="32"
ATTRS{broken_parity_status}=="0"
ATTRS{msi_bus}==""
ATTRS{companion}==""
ATTRS{uframe_periodic_max}=="100"
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
Saya bertanya-tanya apa "rantai perangkat induk", tersirat dari output? Saya tidak begitu mengerti apa looking at (parent) device
artinya mengikuti masing-masing . Sebagai contoh,
Apakah yang pertama HDD eksternal saya? Apa sisanya?
Mengapa semua kecuali dua yang terakhir memiliki "usb" dalam '...'?
Apakah yang di sebelah slot PCI terakhir?
Apa yang terakhir yang begitu kosong, meskipun ada pci
dalam namanya?
Apakah "berjalan" berarti dari HDD eksternal ke CPU?
Terima kasih!