On Wed, Feb 06, 2002 at 02:14:05PM -0500, Benjamin Scott wrote:
> On Tue, 5 Feb 2002, James Hawtin wrote:
> > I think the reason most people don't do backups is because, hard disk
> > drives are really big and really cheap. Tape drives are really expensive,
> > media is also expensive and frankly tapes are very small for the cost.
> Here are some prices from a recent Datacomm Warehouse catalog:
> Item GB Cost $/GB
> -------------- --- ---- ----
> IDE HDD 100 270 2.70
> AIT2 50 90 1.80
> SuperDLT 110 150 1.36
> LTO Ultrium 100 130 1.30
> DDS-4 20 24 1.20
> As you can see, hard disk is actually the most expensive media, not the
> least. This whole "hard disks are cheaper" thing is a myth propagated by
> people who have never actually looked at the numbers.
Ok, now factor in time to back up a volume.
1 terabyte of small images from netapp F760 to a tape unit takes us
almost 45 hours.
Of course, that data has changed by 5 to 10 percent in that 45
hours.
It takes less than 20 to dump it to a cheap IDE JBOD/Linux raid
solution.
> > Effective backup can double the cost of a system and requires time to
> > manage it.
> Sure it can. Losing your data will generally cost even more.
Yup. Losing data often enough, or in sufficient quantites can kill
your company.
> > For the "home" market its just to much.
> The home user has maybe, what, 100 MB of data to protect, tops? You can
> fit that on a $2 CD-RW, for crying out loud.
> > This why people don't have backups in my book.
> "Most people" don't have backups because they don't know any better, and
I don't do backups at home because I generally have the important
data (err...my resume) replicated slapdash over several machines.
Everything lese I can re-download from the net, or re-install from
CD.
At work, well that's a different story.
--
Share and Enjoy.
_______________________________________________
linux-lvm mailing list
linux-lvm@sistina.com
http://lists.sistina.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
