[Nottingham] Tape Backup Systems
robertpostill at yahoo.co.uk
Mon Apr 14 12:13:43 BST 2008
On 12/04/2008, at 4:52 AM, David Bean wrote:
> Compare the sustained transfer rate of a hard disk to a tape. A modern
> Tape such as an LTO4 can outperform an equivalent external hard disk.
> One issue is that some combinations of RAID arrays, filesystems and
> usage (lots of small files are bad) cannot provide data quick
> enough to
> keep up with the minimum streaming speed of a tape.
My experience is that LTO4 is capable of keeping up with low-end
internal hard disk but if you're backing up any of:
* A SAN/NAS rig
* Fibre Channel drives
*A decent RAID array
you're in bother. For a heavy workload like that you'll need
something like a 9840 or T10000 drive. Although expect a rig with
that kind of hardware (12 drives, fibre channel interface and 600 or
so tapes to start at 100k USD) to be a serious money piece of kit for
the kind of company that's got very deep pockets ;) I feel like
we're at a point where we just don't have the capacity for the home
user or small business/organisation most of us work for any kind of
responsible backup. So a couple of hard disks is about the best
option you've got.
Also I'd say (in a quick Linux gloat) that Windows servers (never
mind clients) *never* can keep up with Linux/Solaris machines, so all
this is moot if you have Windows.
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