Re: Best way to mirror two drives
hi ya lance
mirroring and backup is not quite the same ...
am gonna assume that you wanna backup your first 30Gb system... onto
your new 2nd 30Gb disks
- best way is to: ( varies from person to person )
- put the 2nd 30GB onto a different server
to protect your data/disk against power surges
- for backups of data itself
- do daily incremental backups from the last full backup
- do weekly 30-day incremental backups from the last full backup
- do weekly or monthly full backups
- only backup "user data/config" say in /home and /etc ...
dont bother backing up system files that is already on your cdrom
- backups can be done with tar, rsync, cp, mirror, etc..etc....
- backups must be tested ... tested [ir]regularly ...
- simulate the disk failure...
( dont wait till a real failure occurs )
unplug it.... now panic and restore it
try to restore your data onto a different test disk and see if you
can recover your data till yesterday ( your last backup )
have fun
alvin
http://www.Linux-Backup.net ... free backup scripts ..
dd is good for copying/mirror a disk ... but could be slow for 30Gb...
tar and find is good and fast for incremental backups and full backups
cpio... not amongst my fav ways of doing stuff
mounting the backup disks or not... and ssh'ing or not is up to your level
of comfort/paranoia
On Wed, 19 Dec 2001, Serafim Zanikolas wrote:
> On Tue, Dec 18, 2001 at 11:59:05AM -0600, Lance Hoffmeyer wrote:
> >
> > I just purchased a second 30G drive that I want to use as part of my backup
> > strategy. I now have two 30G drives in
> > my computer. I don't have a RAID card. I have /dev/hda and /dev/hdb. What is
> > the best way to mirror /dev/hda?
> > I have thought of
> >
> > dd
> > cp
> > rsync
> >
> > but am not sure which method would be most efficient. Are there other methods
> > I am leaving out?
> >
>
> Hello Lance!
>
> Don't know which is the most efficient way but, you've missed tar:
>
> tar cp src_dir | tar xpf - -C /path/to/dest
>
> which will reproduce the directory hierarchy of src_dir under
> /path/to/dest
>
> You can also investigate the functionality of cpio, dump and pax.
> Unfortunately I'm not experienced with these. You can try
>
> apt-cache show name
>
> to get a full description of a package and you can also try
>
> apt-cache search backup
>
> to get a list of (hopefully) relevant packages.
>
> HTH,
>
> > Lance
>
> --
> Serafim Zanikolas Proud of running
> http://www.it.teithe.gr/~serzan Debian GNU/Linux
>
>
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