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X-RAID change/upgrade question
Hello, I do have a tiny question about upgrading an X-RAID setup. I am running a RN104 with 4 x 4TB disks with a total 10.90TB of capacity. Currently I am looking for some possible disk upgrade p...
schlaraffen wrote:
- If I would exchange 1x 4TB disk with ...lets say a 8 TB disk, nothing would change regarding the total capacity of 10.90TB. Right?
- If I would exchange 2x 4TB disks with 2x8TB disks, the total capacity of the X-Raid would increase to 14.90TB. Right?
Close. with 4x4TB, you actually have a 12 TB volume. But the NAS reports TiB (1024*1024*1024*1024 bytes), not TB (1000*1000*1000*1000 bytes). 12 TB is the same as 10.9 TiB.
upgrading 2 drives to 8 TB will give you a 16 TB volume - which is the same as ~14.5 TiB (not 14.9).
schlaraffen wrote:
Is a mixed disk environment like mentions in option number 2 possible and would it work?
Yes. The capacity rule is "sum the disks and subtract the smallest". Note there are some rules with mixed sizes. For instance, you can't put a 3 TB drive in your existing array. And after you add 2x8TB you won't be able to upgrade one of the 4 TB drives with a 6 TB drive. You will be able to replace it with a 4TB drive if you like.
schlaraffen wrote:
Of course I would plan to exchange the other 2 x 4TB disk for performance reason after a while to get a native 4 x 8TB config at the end.
There won't be much (if any) performance gain.
schlaraffen wrote:
- If I would exchange 1x 4TB disk with ...lets say a 8 TB disk, nothing would change regarding the total capacity of 10.90TB. Right?
- If I would exchange 2x 4TB disks with 2x8TB disks, the total capacity of the X-Raid would increase to 14.90TB. Right?
Close. with 4x4TB, you actually have a 12 TB volume. But the NAS reports TiB (1024*1024*1024*1024 bytes), not TB (1000*1000*1000*1000 bytes). 12 TB is the same as 10.9 TiB.
upgrading 2 drives to 8 TB will give you a 16 TB volume - which is the same as ~14.5 TiB (not 14.9).
schlaraffen wrote:
Is a mixed disk environment like mentions in option number 2 possible and would it work?
Yes. The capacity rule is "sum the disks and subtract the smallest". Note there are some rules with mixed sizes. For instance, you can't put a 3 TB drive in your existing array. And after you add 2x8TB you won't be able to upgrade one of the 4 TB drives with a 6 TB drive. You will be able to replace it with a 4TB drive if you like.
schlaraffen wrote:
Of course I would plan to exchange the other 2 x 4TB disk for performance reason after a while to get a native 4 x 8TB config at the end.
There won't be much (if any) performance gain.
Thank you Stephen. Great support!
When you vertically expand a ReadyNAS, the OS creates another RAID "layer" on top of the old one. Expanding a 4-drive unit by replacing two with bigger drives will make the second layer RAID1. Replacing yet another will convert it to RAID5, and the last will expand the RAID5 to 4 drives. But it will never consolidate those layers into one like you would get if you started fresh with the 4 bigger drives.
But that doesn't really matter. BTRFS in OS6 is designed to span devices like that.
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