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Forum Discussion
Understanding Expansion Limits
Hi all,
I'm looking to expand my existing Ultra6 that has 6x 2TB drives in a 7399GB XRAID2 volume. I'm finding the 8TiB expansion limit a bit confusing, so I wanted to try to get some confirmation from folks here that I'm understanding it correctly. I'm running 4.2.24 currently.
From what I understand, it looks like the limit is adding more than 8TiB to an existing volume rather than an 8TiB volume size limit, correct?
I realize that once I expand, I'm stuck next time I need more room figuring out how to backup and factory default (I'm certain I'll have 14TiB of extra storage laying around for that :) ), but for now I should be OK.
Thanks in advance for any guidance.
I'm looking to expand my existing Ultra6 that has 6x 2TB drives in a 7399GB XRAID2 volume. I'm finding the 8TiB expansion limit a bit confusing, so I wanted to try to get some confirmation from folks here that I'm understanding it correctly. I'm running 4.2.24 currently.
From what I understand, it looks like the limit is adding more than 8TiB to an existing volume rather than an 8TiB volume size limit, correct?
- If that's the case, then I should be safe upgrading all six of my 2TB drives to 4TB drives without an issue because the total size added to the volume would be less than 8TiB, yes? I should end up with a volume that is roughly 14800GB. I'll be moving from a 6.73TiB volume to a 13.46TiB volume, which is way under the 8TiB limit.
- If I wasn't able to upgrade to 6x 4TB drives for some reason, would I be able to upgrade to 5x 4TB and 1x 3TB to stay just under the limit? Is there anything detrimental to doing this other than the OCD flare ups I'll experience?
I realize that once I expand, I'm stuck next time I need more room figuring out how to backup and factory default (I'm certain I'll have 14TiB of extra storage laying around for that :) ), but for now I should be OK.
Thanks in advance for any guidance.
5 Replies
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- Provided you last did a factory default with the 6x2TB drives in place then expanding the existing volume when upgrading to 6x4TB drives should not be a problem.
- Thanks for the confirmation.
I believe I did factory default with all 6 drives in place. Is there a way to confirm what the initial size was? - Your precision in using TB and TiB raises a question that perhaps mdgm can answer.
The 8 and 16 limits, are they in TB or TiB? The release notes for firmware use TB for the 16 limit and we see volume sizes displayed in TB. Quick look around the forum and the units are used interchangeably usually, but not in your original post. - Now that I review things, I'm not even sure why I differentiated between TB and TiB. :(
- The 16 "TB" limit is certainly TiB. That is the point where the inodes need to be converted from 32 to 64 bit addressing.
I believe 8 "TB" limit is also TiB, though that is a bit harder to sort out.
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