Copying files from RAID0 to NAS doubled file size; Files no longer fit on the RAID

[abon219]

Hi all,

I have a RAID0 that was backed up to a large NAS. We wanted to format the RAID to a different file system structure. The original drive is still setup in RAID0. It's an 8Tb setup in RAID0 (thus 4Tb capacity). Now when we try to copy the files over again, it's saying that it's too large and the RAID doesn't have enough space.

Any assist with this would be great. We're not super familiar with how the RAID was setup initially.

 

[androbourne]

What sector size did the original Raid have and what sector size did you reformat the new Raid with?

Also what the was the original size of the content and what did it become after moving it off the Raid?

 

[abon219]

What sector size did the original Raid have and what sector size did you reformat the new Raid with?

Also what the was the original size of the content and what did it become after moving it off the Raid?

To my knowledge, a 512 byte size was maintained the entire time. Originally ~3.5Tb of data on raid. Copied to NAS showed 6.3Tb. Tried to consolidate files on NAS to one folder, and jumped to 7.2Tb.

 

[androbourne]

Do you know if compression was turned on in whatever device is hosting the Raid? Even if it was, 3.5tb to compress down too from 7.2tb seems way off for Windows compression. It's never that great.

Have you tried running something like TreeSize to scan the directory and see if something is showing what is taking up all the space? Maybe there are some zipped files that somehow unzipped themselves after moving the data?

 

[abon219]

Do you know if compression was turned on in whatever device is hosting the Raid? Even if it was, 3.5tb to compress down too from 7.2tb seems way off for Windows compression. It's never that great.

Have you tried running something like TreeSize to scan the directory and see if something is showing what is taking up all the space? Maybe there are some zipped files that somehow unzipped themselves after moving the data?

Something we can try I suppose.This is on Mac. Not sure if that makes a difference.

 

[androbourne]

Was the original device with the Raid on it a Windows machine?

 

[abon219]

Was the original device with the Raid on it a Windows machine?

I don't believe so.

 

[little_me]

To me, it sounds like a problem with setup of raid.
You had two 4TB disks in RAID0, thus 8TB total space.
If set up correctly, said RAID0 after setup/format should still have 8TB total space, if it has only 4... It's mistakenly either set up as RAID1 or.. one of the disks is missing.

RAID0 stores pretty much half the bits on each drive on setup, effectively doubling the disk capacity for the total size, so 4TB and 4TB is 8TB (give or take a bit since disks use 1,000,000 and computer uses 1,048,576 for 1MB)

Edit: Only other reason I can think of that would cause "not enough space" or equivalent errors would be if new file system was FAT32 or something similar that limits file sizes to 4GB, past that and total size problems mentioned above, I see no real reason why there would be a problem in copying things back.

 

[abon219]

To me, it sounds like a problem with setup of raid.
You had two 4TB disks in RAID0, thus 8TB total space.
If set up correctly, said RAID0 after setup/format should still have 8TB total space, if it has only 4... It's mistakenly either set up as RAID1 or.. one of the disks is missing.

RAID0 stores pretty much half the bits on each drive on setup, effectively doubling the disk capacity for the total size, so 4TB and 4TB is 8TB (give or take a bit since disks use 1,000,000 and computer uses 1,048,576 for 1MB)

Edit: Only other reason I can think of that would cause "not enough space" or equivalent errors would be if new file system was FAT32 or something similar that limits file sizes to 4GB, past that and total size problems mentioned above, I see no real reason why there would be a problem in copying things back.

Good idea, but I'm not entirely sure how it was setup originally (not my device). It's exFAT so shouldn't have a problem with file size.

 

[hang-the-9]

Hi all,

I have a RAID0 that was backed up to a large NAS. We wanted to format the RAID to a different file system structure. The original drive is still setup in RAID0. It's an 8Tb setup in RAID0 (thus 4Tb capacity). Now when we try to copy the files over again, it's saying that it's too large and the RAID doesn't have enough space.

Any assist with this would be great. We're not super familiar with how the RAID was setup initially.

I think you are confused about what RAID is setup, if you have 8TB of disks and have 4TB capacity you have RAID 1 not 0. RAID 0 would add the drives together for capacity, RAID 1 you will only see one disk since other is used as the mirror disk. Or are you saying each drive is 4TB in capacity? There may be some more confusion as to what you are copying to what. Did you actually check the size of the data you are copying and where you are moving it to?

 

[androbourne]

I would agree. It was most likely using Raid 0.

The reason I asked about sector sizes was because that can cause that issue as well. But not in such a large amount as a 4TB difference. No where close. If anything it would be a few GB.