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Author Topic: Slow Backup  (Read 5303 times)

DRadlin

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Slow Backup
« on: November 19, 2009, 06:49:44 PM »
I have two drives installed in my DNS-323, formatted as separate volumes without RAID.

I'm using NovaBackupPro to backup data from volume 1 to volume 2 the data transfer rate started around 5 Mb/s and has been steadly decreasing and is now below 1.2 Mb/s.  I am trying to backup 160Gb of data.

My backup has been running for over 32 hours and it looks like this will never finish.

I can copy the entire drive contents off the DNS-323 to a drive on my workstation within an hour or so.

Why is it so slow copying across drives in the DNS?

Have otheres experienced slow backups to their DNS-323 or across volumes within it?  Any recommendations or solutions.

Dave
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fordem

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Re: Slow Backup
« Reply #1 on: November 20, 2009, 05:00:14 AM »
First - you're copying data from the DNS-323 across the network to your PC and then back again to the DNS-323 - not the most efficent way to do things.

Second - and I am not familiar with NovaBackupPro, but if it's a "filesync" type of backup, you may be running into a slowdown that occurs when you copy large quantities of small files.
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RAID1 is for disk redundancy - NOT data backup - don't confuse the two.

DRadlin

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Re: Slow Backup
« Reply #2 on: November 20, 2009, 12:37:03 PM »
I didn't realize it, but I see now that I can configure a "scheduled download" to backup data from one volume to another within the NAS.

So this will be fast since the data transfer is only within the NAS device?

How about a "scheduled download" from a volume on one NAS to a volume on a different NAS - since this involves a network connection would I expect it to be slow?

Dave
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gunrunnerjohn

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Re: Slow Backup
« Reply #3 on: November 20, 2009, 01:05:42 PM »
Going between NAS units will be slower than internal copies within the box.
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Microsoft MVP - Windows Desktop Experience
Remember: Data you don't have two copies of is data you don't care about!
PS: RAID of any level is NOT a second copy.

DRadlin

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Re: Slow Backup
« Reply #4 on: November 20, 2009, 02:22:03 PM »
Yes, slower than internal copies.... but impractically slow as I am seing using a backup program executed from a network workstation?
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gunrunnerjohn

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Re: Slow Backup
« Reply #5 on: November 20, 2009, 04:53:39 PM »
Actually, I do that exact thing.  I run a weekly backup of my DNS-323 to my DNS-321 using a program called Beyond Compare.  It does a synchronization of about 800gigs of data, any changes are written to the DNS-321, and any files not present on the DNS-323 are removed.  The average throughput is over 10mbytes/sec, and some of that is attributed to a lot of small files, which are much slower than large files.

The network is configured for 4K jumbo frames and of course gigabit connections.
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Microsoft MVP - Windows Desktop Experience
Remember: Data you don't have two copies of is data you don't care about!
PS: RAID of any level is NOT a second copy.

DRadlin

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Re: Slow Backup
« Reply #6 on: November 21, 2009, 01:26:10 PM »
I can "copy and paste" 160 Gb across NAS volumes, across NAS devices, or NAS to a workstation and it will take maybe two hours to copy.  If I use a backup program (I've tried Windows Backup, Memeo, and NovaBackup) it takes days.  Both those methods involve network transfers while one is "fast" and the other slow... so the network isn't to blame.

A "scheduled download" across volumes took almost a full day to transfer 160Gb.  Again the network can't be blamed.

Any fast backup utilities out there that will compete with the speed of "copy and paste"?

Dave
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gunrunnerjohn

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Re: Slow Backup
« Reply #7 on: November 21, 2009, 02:08:37 PM »
I use Beyond Compare www.scootersoftware.com and it does backups at a decent pace.
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Microsoft MVP - Windows Desktop Experience
Remember: Data you don't have two copies of is data you don't care about!
PS: RAID of any level is NOT a second copy.

deca66

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Re: Slow Backup
« Reply #8 on: November 28, 2009, 03:01:57 AM »
Quote from: DRadlin on November 21, 2009, 01:26:10 PM
I can "copy and paste" 160 Gb across NAS volumes, across NAS devices, or NAS to a workstation and it will take maybe two hours to copy.  If I use a backup program (I've tried Windows Backup, Memeo, and NovaBackup) it takes days.  Both those methods involve network transfers while one is "fast" and the other slow... so the network isn't to blame.

A "scheduled download" across volumes took almost a full day to transfer 160Gb.  Again the network can't be blamed.

Any fast backup utilities out there that will compete with the speed of "copy and paste"?

Dave
You have to consider that a backup software does several access to both drives to compare date or archive attribute for each files. Whereas a "copy/poste" not. That's a big difference it's seems.
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