Is SCSI device identification different than other hard drives? Explain.
Yes. SCSI IDs aren’t used to identify the corresponding device file on a Linux system. Hard drives follow the naming system /dev/sdx (where x is a letter from a up), SCSI tapes are named /dev/stx and /dev/nstx (where x is a number from 0 up), and SCSI CD-ROMs and DVD-ROMs are named /dev/scdx (where x is a number from 0 up).
Tags: 101.1, devices, fs, hard drives, linux, scsi
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What problems can arise involving SCSI device numbering, and what are the best practices when adding new SCSI drives?
SCSI device numbering (or lettering) is usually assigned in increasing order based on the SCSI ID. If you have one hard disk with a SCSI ID of 2 and another hard disk with a SCSI ID of 4, they will be assigned to /dev/sda and /dev/sdb, respectively. The real danger is if you add a third SCSI drive and give it an ID of 0, 1, or 3.
This new disk will become /dev/sda (for an ID of 0 or 1) or /dev/sdb (for ID 3), bumping up one or both of the existing disks’ Linux device identifiers. For this reason, it’s usually best to give hard disks the lowest possible SCSI IDs so that you can add future disks using higher IDs.
This new disk will become /dev/sda (for an ID of 0 or 1) or /dev/sdb (for ID 3), bumping up one or both of the existing disks’ Linux device identifiers. For this reason, it’s usually best to give hard disks the lowest possible SCSI IDs so that you can add future disks using higher IDs.
Tags: 101.1, devices, fs, hard drives, linux, scsi
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Can non-SCSI devices be assigned SCSI identifications in the file structure?
Yes. Non-SCSI devices such as USB drives or SATA drives can be mapped to the SCSI sub-system, and interfere with the SCSI device numbering if you are not careful.
Tags: 101.1, devices, fs, hard drives, linux, scsi
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What command should you run before unplugging any external device? What can happen if you don't?
The umount command. Loss of data or corruption of the file system can occur if you simply unplug it.
Tags: commands, devices, linux, umount
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What command/utility can you use to get a list of attached USB devices, even with no options?
lsusb
Tags: 101.1, devices, linux, lsusb
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Kartensatzinfo:
Autor: Ryan Robson
Oberthema: Informatics
Thema: Linux
Ort: Houston
Veröffentlicht: 08.02.2011
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