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Balancing Issue / Unusable for Duplication


abailes

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Hi,

 

I had 4 x 3Tb drives in a DrivePool.  All was working great, until one of the drives failed.  I replaced this drive with a 6Tb drive, so I now have 1 x 6Tb and 3 x 3Tb drives.  

 

The 6 Tb drive has Over 4Tb 'Unusable for duplication'.  Nothing will balance to it, it is just showing as free space.  And the other three drives are now full, I cannot add to the Drive Pool at all.  There are no partitions on this drive or anything odd like that - it is a brand new drive.

 

I have chosen the 'reset to factory settings option in DrivePool, but it is still not balancing correctly.  What am I doing wrong?  Why is so much of the larger drive 'unusable'?

 

Many thanks

 

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Depending on the exact layout, this may be entirely normal. 

 

The "Unusable for duplication" space is the amount of space that can't be used to duplicate your files, because of a combination of the different sizes of your pooled drives, the different sizes of your files in the pool and the space consumed by the "Other" stuff. DrivePool minimises this as best it can, based on the settings and priorities of your Balancers.
As for the other drives being full, this can/will prevent new files from being placed on the pool, due to the "free space check". We perform it for each drive,, rather than the whole pool, to prevent issues. 
 
That said, it sounds like you may want to install the "Disk Space Equalizer" balancer plugin, as this will forcibly rebalance teh data to be equalized between the disks. 
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Many thanks.  I don't know what was going on as the normal explanations didn't cut it - I have thousands of files in these drives, all much smaller than Tb, and also the 'usable' space on the 6Tb drive was smaller than 3Gb.  If I took files out of the DrivePool, the unusable space just got bigger.  It didn't make any sense.  Anyway, the Disk Space Equalizer seems to have worked well, I have to set to 'Percentage of Drive' and its looking good - just starting a huge rebalancing process now

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