Re: NAS or USB Backup?
- From: "Brian Cryer" <brianc@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 4 Dec 2007 10:17:01 -0000
"Dave W" <mtdave@xxxxxxxxx> wrote in message
news:ae27b3e6-34de-4b1a-9f8b-8fe13f5c0c35@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
<snip>
OK, so in theory, a USB 2.0 drive at 480Mbps will run slower than a
gigabit connection runing at 1000Mbps assuming the NIC and the drive
is the same right?
USB typically run slower than this, but the point is that its the drive
(single, mirrored, raided - whatever the configuration) that is the
bottleneck not the interface (USB or network).
Right now, we are backing up 175GB of data (full backup) to a gigabit
connected Western Digital hard drive -- and it takes 18+ hours. Does
this seem reasonable?
Ouch, yes and no.
In a non-SBS environment I backup about 400GB of data each night to a single
external usb disk. This disk holds the backups from three different servers.
Unfortunatly I've no idea how long it takes, but one server (the main office
server) backs up about 340GB of data, the backup kicks of at 1pm and is
always finished before I come into the office at 9am.
The difference in timings is probably due to "how" I do the backup. The
server has three drives:
C: 41GB used
E: 67GB used
F: 236GB used
I use ntbackup to backup the C drive. That plus a script to backup the
sql-server databases (also on C: - I know they shouldn't be but ...)
probably takes the bulk of the time. The backup of the E: and F: drives is
very quick. The reason is that I don't use ntbackup for those but a straight
file copy. Actually its not a straight copy, we use an in-house file-copy
utility similar to xcopy but which also removes files that no longer exist.
The net effect is that the very first time a backup is run it does take an
age but each time the backup is run to overwrite an older-backup it only
needs to copy those files which are new or which have changed (most files
thus don't need copying). The end result is that it is very fast and I end
up with a complete image of the drives plus an nt backup of the system disk.
I don't have figures to hand, but for an SBS setup I use the same approach
and backing up about 100GB of data (ish) comfortably finishes over night.
So perhaps consider how you do your backup. For example would differential
backups help?
--
Brian Cryer
www.cryer.co.uk/brian
.
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