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Why is Volume Size below calculated?
Hi,
I just had to rebuild a chassis (EDA500) from scratch. I did the following:
1. Powered down.
2. Removed drives
3. Deleted partitions
4. Inserted drives
5. Powered on
6. Selected new drives and then, New Volume.
However, I did 8-8-6-6-6 TB WD Red drives and the interface says total size of 21.81 TB versus 23.157 TB calculated. My DATA volume has a similar problem with 8-8-8-8-8-6 and 32.72 TB versus 33.848 calculated.
Any idea why?
Thanks.
- That's fine.
If you don't have any unused drive in the chassis and only one volume per chassis, then turn on X-RAID, and your volume should expand (vertical expansion).
18 Replies
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The difference come from confusing decimal and binary prefixes. Harddisk manufactures prefer decimal, your NAS is using binary.
Prefixes for multiples of
bits (bit) or bytes (B)Decimal Value SI 1000 k kilo 10002 M mega 10003 G giga 10004 T tera 10005 P peta 10006 E exa 10007 Z zetta 10008 Y yotta Binary Value IECJEDEC 1024 Ki kibi K kilo 10242 Mi mebi M mega 10243 Gi gibi G giga 10244 Ti tebi – 10245 Pi pebi – 10246 Ei exbi – 10247 Zi zebi – 10248 Yi yobi – Thanks. I get the reasoning you mentioned, but the difference is very large and even larger on the EDA500 than that of the DATA volume. And, my other EDA500 with 3-3-3-3-3 is actually larger...
That doesn't add up to me.
Retired_Member wrote:
The difference come from confusing decimal and binary prefixes. Harddisk manufactures prefer decimal, your NAS is using binary.
Windows also uses binary (TiB).
teddyb wrote:
However, I did 8-8-6-6-6 TB WD Red drives and the interface says total size of 21.81 TB versus 23.157 TB calculated. My DATA volume has a similar problem with 8-8-8-8-8-6 and 32.72 TB versus 33.848 calculated.
Try entering 21.81 TiB in TB into google search, it will convert the units for you. You should see 23.98 TB
Similarly entering 32.72 TiB in TB will give you 35.98 TiB
Can you check that you typed the disk configuration info correctly? With XRAID single redundancy you should be getting 26TB and 38TB. Dual redundancy would be 16 TB and 30 TB.
The configurations are correct at 8-8-8-8-8-6 and 8-8-6-6-6. Both calculate a higher expected size (kossboss calculator) than I have showing up.
Any ideas why tho?
- Well, irst, do you know why it's off? Is the volume encrypted?
It is not encrypted. So, I really have no idea why it is off. Sorry for the ignorance on the overall topic!
- That's fine.
If you don't have any unused drive in the chassis and only one volume per chassis, then turn on X-RAID, and your volume should expand (vertical expansion).That was it! They immediately started resyncing after that and are fine now. Thanks!
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