LBA
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Ares DisksAres has five internal 3.5 inch hard disk drives. Ares boots up from a 36.4 GB SCSI hard disk, and this disk has two primary partitions and one logical: Disk /dev/sda: 36.4 GB, 36420075008 bytes 255 heads, 63 sectors/track, 4427 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 4244 34089898+ 83 Linux /dev/sda2 4245 4427 1469947+ 5 Extended /dev/sda5 4245 4427 1469916 82 Linux swap / Solaris Partition 1 is the Ares also has four IDE disks that form three RAID 5 sets. The partition table of each disk is: Disk /dev/hde: 203.9 GB, 203928109056 bytes 255 heads, 63 sectors/track, 24792 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hde1 1 1703 13679316 fd Linux raid autodetect /dev/hde2 1704 7783 48837600 fd Linux raid autodetect /dev/hde3 7784 24792 136624792+ fd Linux raid autodetect Note that although all four disks were originally 203.9 GB in size, one disk recently failed and needed to be replaced. It was replaced with a 250.0 GB drive which has the same partition table. There are three further 250.0 GB drives to be used as cold spares in case further drives fail. We use DEVICE /dev/hd[efgh][123] ARRAY /dev/md0 devices=/dev/hde1,/dev/hdf1,/dev/hdg1,/dev/hdh1 ARRAY /dev/md1 devices=/dev/hde2,/dev/hdf2,/dev/hdg2,/dev/hdh2 ARRAY /dev/md2 devices=/dev/hde3,/dev/hdf3,/dev/hdg3,/dev/hdh3 The The The External Drives - /data_removable/ Ares now has two external disks (USB 2.0) as a RAID1 array, mounted as
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Replacing
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