FlexRaid2 - Expanding disks

You would get about 0.9TB of expansion.

Recall the two expansion limitations:
1. 8TB online over the life of the volume i.e. If when you last did a factory default the volume capacity was say 4.8TB you can't expand past 12.8TB.
2. You cannot expand a volume past 16TB. You have to do a factory default with the disks in place.

Ok - found it at: http://kossboss.siigna.net/xraid.html

Awesome.

So current setup is this:

===GIVEN:===
Given: 6 drives
Given Size [base 10]: 18000.000 GB = 18.000 TB
Given Size [base 2]: 16763.806 GB = 16.371 TB

==RESULTS (Will go below):==
Single Disk Redundancy
Disk Space with Raid 5 [base 10]: 15000.000 GB = 15.000 TB
Final Useable/Filesystem Size with Raid 5 [base 2]: 13881.714 GB = 13.772 TB

Want to go to this:

===GIVEN:===
Given: 6 drives
Given Size [base 10]: 20000.000 GB = 20.000 TB
Given Size [base 2]: 18626.451 GB = 18.190 TB

==RESULTS (Will go below):==
Single Disk Redundancy
Disk Space with Raid 5 [base 10]: 16000.000 GB = 16.000 TB
Final Useable/Filesystem Size with Raid 5 [base 2]: 14808.959 GB = 14.692 TB

Now based on the note:

(2) An expansion that causes the Total Filesystem size to be 16 TB or more after the expansion will fail. * These sizes refer to the Filesystem Sizes, not raw disk space.

Am I going to have a problem?

mdgm wrote:
You would get about 0.9TB of expansion. Recall the two expansion limitations: 1. 8TB online over the life of the volume i.e. If when you last did a factory default the volume capacity was say 4.8TB you can't expand past 12.8TB. 2. You cannot expand a volume past 16TB. You have to do a factory default with the disks in place.

Is that base 10 or base 2?

And is that total size as in the calculator, usable space, etc.?

john_es wrote:
I have a readynas pro 6. It has 6, 3TB drives, for a total of 13TB of usable space out of 18TB.

The correct number for single redundancy is ~15TB in power-of-ten units or (equivalently) ~13.6 TiB in power of two units. Frontview reports TiB.

Assuming that is what you meant, then expansion of usable space is 1 TB (or .9 TiB, as mdgm states).

Also - the two expansion limits are also in units of TiB.

john_es wrote:
Now based on the note: (2) An expansion that causes the Total Filesystem size to be 16 TB or more after the expansion will fail. * These sizes refer to the Filesystem Sizes, not raw disk space. Am I going to have a problem?

No. You're not going to hit the 16TB limit by adding two 4TB disks. However what disks were installed when you last did a factory default? Depending what disks were installed it is possible you may hit the 8TB limit that I mentioned in a post above.

Thanks everyone... just to clarify, my NAS was originally setup with the 6x3TB drives.

Now if I go from 6x3TB to 4x3TB+2x5TB, it would increase from

Single Disk Redundancy
Disk Space with Raid 5 [base 10]: 15000.000 GB = 15.000 TB
Final Useable/Filesystem Size with Raid 5 [base 2]: 13881.714 GB = 13.772 TB

to

Single Disk Redundancy
Disk Space with Raid 5 [base 10]: 17000.000 GB = 17.000 TB
Final Useable/Filesystem Size with Raid 5 [base 2]: 15736.203 GB = 15.612 TB

based on the notes from teh page, this is going off of the base 2 filesystem size, so I should still be under 16TB, right?

Yes, but 5TB disks are not available yet