Re: [Networker] SUN X4500 'Thumper' as a storage node?
2007-04-24 01:38:34
On 2007-04-23 14:15, Stan Horwitz revealed:
SH> We don't currently do any kind of disk-to-disk-to-anything backups. I do not
Ive been following this thread for a while now. What I can't figure out is
why one would want to stage from disk to disk when it comes to backups?
Why not write to the secondary disk storage (i.e. cheap disk) right away?
There are several cheap storage systems (for instance the systems from
http://www.infortrend.com) where they just supply a disk array, where you
then buy off-the-shelf products such as actual disks and controller RAM
yourself. In terms of I/O performance, even these systems should be more
than enough for backups. So why do people use tiered disk for backups, or
VTLs? To me, the point of VTL is just to work around backup products that
aren't good at working with file systems or block devices as targets of
backup data. VTLs just seem to limit the functionality of the actual disk,
by emulating library behavior, with its set of limitations such as random
paralell I/O. Why not just use adv_file devices instead, and then just
stage that data to tape?
//Oscar
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