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mturndal

Restroing 121Gb estimated to take 96 hours

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Hi,

 

I have uppgraded to v10.5.0 (145) (i have a macpro 2008 with  Mac OSX 10.7.5) recently and it has been going well.

 

Im about to change the disks of  my stripe set and I wanted to test a restore operation before doing this. I took one directory to restore 121 gb of data.

 

When restore started It reported it will take 96 hours to do !!! When looking the speed of restroing it is around  21-30Mb/min ?

This stripe set is capable of 2.1 - 2.3Gb/min ...

 

If I would translate to replacing the entire disk it would take 1500 hours...  (this woild not be possible)

 

Any ideas ???

 

 

Mikael

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What are you restoring from? Tape, disk, what?

 

Is it one backup/snapshot in the set? Or hundreds?

 

When setting up a raid, do enable write cache. Our raids were really slow when writing data to them until we enabled the write cache.

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I am restoring from disk. (Synology NAS 409+)

I'm using AppleRAID V2.0 so i believe it has the write cache enabled.

I have selected the first backup from the media set for this volume

 

/Mikael

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OK, restoring from disk should be faster than from tape. Also, the number of backups doesn't matter much when it is disk.

 

I have no experience with AppleRAID, but I still say you should check the write cache. With other RAID systems it's off by default, unless you have a battery backup.

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Are you using AFP or SMB (Samba) to communicate with your NAS? If you are using AFP, try SMB and see if you get better performance. The implementations of AFP on Linux, which Synology uses, can sometimes have performance issues.

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Yes I'm using AFP for the NAS connection.

 

In between I have backgraded to 9.02 (107) and I have now correct speed (around 1,6gb/min) when restoring the stripeset

 

I will go back to 10.5 only on server and se what this is going to do.

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I have uppgraded the server to version 10.5 with clients on v 9.0.2 and I still have the slow speed about 20-30mb/min when restoring.

ì will keep the v9 on boths sides until I have uppgraded the stripe set.

 

/mikael

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