Re: backup strategies
hi ya keith
when i work on a backup system....
- i assume your primary machine yu are backing up lost its disks
- i assume the backup disk can also lose its disk...
- disk failures etc is easy to simulate...
- just pull the cable off the disk... and see the panic
and can i still recover....
- backup systems on the same machine you are backing up is NOT
a backup solution.... if the power supply goes poof, you're dead...
if the memory goes bad... the disks gets 'randomly/slowly wiped out"
- tape backups i've seen or come into fixing their boxes after the
fact has all failed to backup... ( mostly cause they didnt rotate
the backup and/or they didnt randomly check the backups is working
( everything is backed up that should be )
if we can recover form a simulated disk crashes...
....good...is it worth the clients time and $$$$....
if not... what other daily backup options is there for 500Gb of data
- Disks are cheap/better for backups...( imho )
- $100 for 20Gb disk...which is good for 2-3 months of backup
for a similar sized "data" disk
- 100% automated and no manual intervention needed for backups
- you have to randomly check your backups...
- no different than checking backups w/ tapes or other media
-- there are dozens of backup-related "system/network" failure modes....
- which ones are the "backup system" supposed to protect against??
- 100% disk full ( on the backup system )
- disk crashes...
- somebody didnt check the backup system regularly/randomly
- somebody didnt change the tape yesterday
- incremental backups was NOT properly implemented
- network connectivity went down
- disk cable insulation was slowly being eaten away...
- dns died
- nfs timeout due to some other pc went offline
- ethernet cable got pulled
- fan died
- flaky memory
- power supply surge
- 110vac power failure
- cpu failure
- incompatible tar/compressed formats
On Thu, 3 May 2001, Keith G. Murphy wrote:
> Alvin Oga wrote:
> > hi ya
> > I'd use disk as backups... if i was starting from scratch
> > - nothing need be done...unlike tapes that requires regular
> > possibly daily interaction )
> Are you not concerned that your disk controller will go wacky, fubarring
> both drives?
> I'd be interested in hearing other opinions/suggestions on this topic.
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