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sbs 2008 backup problems

I am running SBS2008. We are having ongoing problems with our backup. We back up to 2 identical external hard drives and the schedule is configured to run once per day every day. On a frequency of between 3 and 14 days the external hard drive which we change daily except for weekends will go offline. When I look at the device manager it will say that there is an unkown device in the USB field. I have tried deleting the unknown device and restarting the external hard drive as well as restarting the server. I can usually fix it but the fix is not consistant. Last week I deleted the unknown device and 1 USB port and that fixed it, today I had to power reset the External HDD. I moved the External HDD's to a different computer and everything appears good. I can see the backup and navigate around the drive.

I tried deleting and re-establishing the schedule, hoqwever, the problem with that is SBS wants to reformat the drive so previous backups are lost. The External HDD's are 320 Gb SATA and we are backing up about 110 Gb so there is no space issue.

What could be causing backup problems like this and what would be a good way to fix them permanently?
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LostInWindows
Asked:
LostInWindows
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1 Solution
 
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Change your drives weekly. Daily may be a bit too frequent.

If you are going to go with the daily routine, then get at least 2 more drives to introduce bi-weekly and monthly retention.

What kind of external drives are they? We are seeing some with power block issues that will seemingly stall the server or backups due to not enough power being fed to the HDD within the enclosure.

Philip
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LostInWindowsAuthor Commented:
I will get the drive model name and part number on Tuesday. We have a country holiday on Monday.
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LostInWindowsAuthor Commented:
It seems that if we have each external HDD connected to a different cable it will work MOST of the time. However, we don't want to have a myriad of external cables hanging arount the server.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Are they all the same model? Use the same model for your backups. Use a labeller to label them. You will then only have one power cable and one USB cable for your backups.

Get a good quality USB cable to replace the OEM one too.

Philip
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LostInWindowsAuthor Commented:
The External are the identical make and model. The cables are also identical, they are the ones that came with the drives.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
What is the make/model of the drives?

Philip
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LostInWindowsAuthor Commented:
Both are: Seagate Barracuda ES ST3320620NS which is 320 GB
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Any VSS errors in the server logs?

How old is the physical server?

Philip
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LostInWindowsAuthor Commented:
No Errors in the log aside from saying that the backup didn't work. The server was installed in March of this year New Hardware and SBS 2008
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
What is the combined storage size of the RAID arrays?

Philip
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LostInWindowsAuthor Commented:
OS drive is a Raid 1 - 160 Gb HDD with 45 Gb used
Data Drive is also a Raid 1 - 500 Gb HDD with 60 Gb used.
total backup should be about 105 Gb
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Configure a 750GB USB drive for backups. SBS 2008 backup is senstive to the total size of the storage arrays relative to the media size. We usually go 1.5:1 for total storage to backup storage.

Philip
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LostInWindowsAuthor Commented:
I have changed one of the Drives to 1 TB. The problem has changes slightly to be intermeittant, but not drive specifiic. What do you suggest for the next step?
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