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Forum Discussion
NAS 626x New Hard Drive
Hello, I recently installed a ReadyNAS 626x. I stated out with two HDD and just added a third. They two show up and are able to be used. The 3rd is listed, however it did not increase the disk ...
The 3rd drive is the same site as the first two. The last 3 will be 1 size smaller. They are 12 TB drives in there now and 10s after I get them working.
I did notice that in the Log file it says the at it's syncing and the peformence will be slower. Not sure if that has anything to do with it.
Thanks!
Nixxon wrote:
I did notice that in the Log file it says the at it's syncing and the peformence will be slower. Not sure if that has anything to do with it.
It won't expand until it's done resyncing.
Nixxon wrote:
The 3rd drive is the same site as the first two. The last 3 will be 1 size smaller. They are 12 TB drives in there now and 10s after I get them working.
That won't work. You can't add smaller drives to an existing XRAID array.
- Thanks for the info on syncing. I’ll just wait till it’s done.
That’s interesting info about the drive sizes. The configuration template says it will work. Does that need to be done in the beginning? I thought the point of auto sizing the raid was for quick expansion?
Nixxon wrote:
That’s interesting info about the drive sizes. The configuration template says it will work. Does that need to be done in the beginning? I thought the point of auto sizing the raid was for quick expansion?Not sure what you mean by the configuration template. But you cannot add a smaller drive to an existing array.
Here's what happens if you start with the 10 TB drives:
- The first two drives would have a single RAID-1 group, capacity is 10 TB (~9.1 TiB).
- The third drive would convert that RAID group to RAID-5. capacity would be 20 TB (~18.2 TiB)
- The fourth drive (12 TB) would expand that RAID-5 group to 30 TB (27.3 TiB). 2 TB of the capacity would be unused.
- The fiifth drive (12 TB) would exand the first RAID-5 group to 40 TB. The system would create a second RAID-1 group using the 2 TB of extra capacity of the drives 4 and 5. That is concatenated with the first RAID group, and the combined volume is 42 TB (38.2 TiB).
- The last drive (12 TB) expands the first RAID-5 group to 50 TB. The second RAID-1 group is converted to RAID-5, and is 4 TB. Total volume size is 54 TB (49.1 TiB)
But when you start with the 12 TB, the process fails on step 3. There would be a 3x12TB RAID-5 group before you inserted the 10 TB drive. In order to proceed, that RAID group would need to be split into a 3x10TB RAID-5 group and an 3x2TB RAID-5 group. XRAID can't do that.
You can switch to FlexRAID and create a second array from the three smaller drives, but you'll lose the space of one of the three to the RAID redundancy just as you have one of the three 12TB.
If you want to start over before you get too much data on it, just make sure at least one of the drives is 10TB when you create the initial RAID.
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