This server is attached to a NAS with four NAS disks of half a terabyte. Here is an overview of disks on a RHEL4u3 server with two real 72GB scsi disks. Remember that sata disks are also presented to you with the scsi /dev/sd* notation. fdisk -l | grep Diskĭisk /dev/hda: 60.0 GB, 60022480896 bytesĭisk /dev/hdb: 81.9 GB, 81964302336 bytesĪnd here an example of sata and scsi disks on a server with CentOS. Below the result on old Debian desktop, with two ata-ide disks present. You can start by using /sbin/fdisk to find out what kind of disks are seen by the kernel. Most current disks use LBA (Logical Block Addressing). Old hard disks (and floppy disks) use cylinder-head-sector addressing to access a sector on the disk. Note also that the ISO 9660 standard for cdrom uses a 2048 byte block size.
Note that a character device is a constant stream of characters, being denoted by a c in ls -l. VolGroup-lv_swap (dm-1) 253:1 0 928M 0 lvm Ī block device has the letter b to denote the file type in the output of ls -l. Blocks can be accessed independent of access to other blocks. Random access hard disk devices have an abstraction layer called block device to enable formatting in fixed-size (usually 512 bytes) blocks.
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