Re: Backup Failure With USB External HDD
- From: "Dave Bolt" <dave@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 2 Sep 2008 23:17:03 +0100
Siv,
Just my 2 pennies worth on USB Hard Drives
All the ones I have seen running on USB power are actually Laptop drives
(low power consumption), and lower performance than I would expect from 3.5"
drives.
My preference is to get 3.5" drives that have their own power supply so that
I
a) take the power supply load off the USB altogether
b) get faster drives
Having said that, I have a client who uses one of each quite happily. The
2.5" gets all it's power requirements from the server directly and it does
not cause any difficulties apart from a longer timeframe for the actual
backup process.
Regards
Dave
"Siv" <Siv@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:18014566-60EA-4D8E-A2FF-97AED023AD61@xxxxxxxxxxxxxxxx
Hi,
I have a client who uses 3 Iomega USB 2.5" external disk drives as their
backup method using the inbuilt backup wizard. I have set the drives to
only
have 1 backup on them as prior to this I was constantly get messages like
this:
Alert on SERVER01 at 12/08/2008 08:57:18
The following disk is low on free disk space. Low levels of free disk
space
can cause performance problems and prevent users from saving files on the
disk.
Drive Letter: HarddiskVolume31
Free Disk Space: 0.000000. MB
% Free Disk Space: 0.000000.%
You can disable this alert or change its threshold by using the Change
Alert
Notifications task in the Server Management Monitoring and Reporting
taskpad.
First off how do I work out which hard disk is "HarddiskVolume31" it bears
no resemblance to anything I can find in Disk Manager?
The main problem though is that occasionally the backup will slow to a
complete crawl and take all night and in the morning I have to terminate
the
NTBackup program as it is still running. Is this a known problem using
external USB HDDs or is there soemthing else going on. I have disabled
Sophos On Access scanning on the G: drive which is the letter the external
backup disks get allocated.
The disks are "safely removed" each morning and the next one in the
sequence plugged in. When the backup doesn't fail these disks are
excellent
and much simpler to use and faster than tapes.
One other fact that might be of relevance, these drives do not have a
power
supply they use a dual USB cable so that they can draw power from 2 USB
sockets at once.
Any advice or help appreciated.
Siv
--
Martley, Near Worcester, UK
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