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Jammyb

usable for duplication

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howdy!

 

please see attached image, i currently cannot write any files to the pool as whilst it says "479GB free" i can only put another 10GB on it as the as "unusable for duplication" has filled up the rest. when i attempt to do so, windows says "drive is full".

 

please help!

 

its an 8 disc pool of various sizes. no duplication is in use. scanner installed and the drives are fine.

 

the only plugin i use is file placement order as when i move a big file, it has the space on one drive to do it.

unuable.png

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Yeah, so as you have used ordered file placement to fill up drives in order and, it appears, up to 100%, there is only 1 (one) HDD with free space. You can't duplicate to one HDD though so that is unusable for duplication. If you have 480GB free space in the Pool then one HDD should not have more than 240GB free or you can not use all space in an x2 duplication scenarion.

Personally, I would always want to have enough space so that the Pool can reorganise after a failure of the largest HDD. Perhaps it is time to add/replace a HDD.

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You can, just not as x2 duplication because the 480GB free space is (mostly) free on one single HDD. DP will not write duplicates to the same physical HDD.

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then why won't it let me?

 

says "disk full"

 

i'm not using duplication. its carbon copied to another drive pool on another machine.

 

 

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I see an "x2" to the left of the pie chart, that indicates at least something is duplicated?

Oh wait, it probably tries to write to Disk 8 to fill that up first and that one does not have enough space. Do you have it set to fill up drives to 100%? How much are you trying to write?

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1x 35GB file.

 

only folder thats duplicated is 3x "metadata" and that folder doesn't exist anywhere other than within drivepool duplication settings,. and i cant't alter it.

 

 

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its working now. deleted some files [1-2GB worth] and now its working.

thanks for the insight into the duplication. i will get another drive fitted.

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Yeah, so my remarks about duplication were useless actually. You already said you did not use any and I was confused by the "x2" information (weird that).

It was because due to the ordered file placement causing DP to try to write to disk 8 which only had, I think, about 8GB free. How 1-2GB deletions helped I don't know. Anyway, I don;t think there is a real need to use order file placement and it can in fact cause some of these kind of issues I would think. But adding a drive would help a lot.

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did it for 2 reasons.

1. ordered placement is based on age of drives. i'd prefer the oldest in the pool to have the easiest life, so be read from only. whilst newest gets written to until newer one arrives on the scene.,

2. since storage in the last 2 months has gone under 1TB free, when i started to get the "disk full" errors from windows due to the pool space spread too thinly, until the new drive is added i decided to then utilise the plugin.

 

still don't know why it gives me the error, plus file transfer speeds have slowed down as well. so will need to get a new drive in ASAP.

 

 

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What may be good to know is that when you write a file to a Pool, DP will select a disk, based on the balancer settings, and that selection may point to a HDD with little space free. Then a write will fail. DP does not spread individual files over more than one disk.

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Just now, Umfriend said:

What may be good to know is that when you write a file to a Pool, DP will select a disk, based on the balancer settings, and that selection may point to a HDD with little space free. Then a write will fail. DP does not spread individual files over more than one disk.

which i thought if i set file placement plugin to 100% then i've circumvented it and it cannot physically write to that disk. it seems it still tries and then consequently fails.

so, it basically needs more space and just to work at default settings so it can physically write anywhere it damn chooses.

 

 

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To clarify a few things, here: 

The "unusable for duplication" is a red herring here. It isn't actually impacting you, one way or another.  You can safely ignore it. 

For the write error, it looks like it is set to write to disk 8, which has very little space left. It's not overflowing to Disk 10, because of the balancing settings (and would only do so for duplicated data). 

 

You may need/want to change the disk order in the Ordered File Placement balancer plugin to fix this. 

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