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Manual Mirroring
Peter Baer Galvin
http://www.samag.com/documents/s=1148/sam0107j/0107j.htm
This month's column includes a handy script for performing a manual mirroring of your root disk drive. Also included is a way to recover a failed disk, a book review, a security hint, and some follow-up information about last month's column.
In last month's column (Reliable and Practical Root Disk Mirroring), a complex solution to "perfect disk mirroring" was presented. That solution included a combination of Solstice Disk Suite and Veritas Volume Manager. Disksuite was used to mirror the root disk, and Volume Manager was given a small slice of root for rootdg to keep it happy and left to manage the remaining disks.
There are times when a simple disk copy is more appropriate than a RAID-1 set. There are also times when both, together, are the best solution. For example, a workstation might need its second disk for scratch or work space, but may on occasion need its root disk copied (for example, before an operating system upgrade, as a backup copy). On the other extreme, a "must never fail" server of an extra-paranoid systems administrator can provide the most uptime by having RAID-1 of the root disk, and a nightly static copy of the same disk.
This static copy can protect you when RAID-1 cannot. For example, a new systems administrator may make a mistake on the root disk, deleting files or making inappropriate edits to system files. RAID-1 will happily, immediately, replicate the mistake to the mirror copy. With a static nightly copy, undoing the mistake is fairly trivial. Likewise, a security incident that effected the root disk could be undone by booting from the previous night's copy.
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