For completeness here's the summary of my replacement of all four 6 TB drives
(henceforth "6T") with 8 TB drives ("8T") in a btrfs raid1 volume.
I included transfer rates so maybe others can get a rough idea what to expect
when doing similar things. All capacity units are SI, not base 2.
> a "replace" of the 3rd 6 TB drive onto a second 8 TB drive is currently in
> progress (at high speed).
This second replace is now finished, and it looks OK now:
# btrfs replace status /data
Started on 16.Jun 01:15:17, finished on 16.Jun 11:40:30, 0 write errs,
0 uncorr. read
>> So I was back to a 4-drive raid1, with 3x 6 TB drives and 1x 8 TB drive
>> (though that 8 TB drive had very little data on it). Then I tried to
>> "remove" (without "-r" this time) the 6 TB drive with the least amount
>> of data on it (one had 4.0 TiB, where the other two had 5.45 TiB each).
>>
> Replace doesn't need to do a balance, it's largely just a block level copy of
> the device being replaced, but with some special handling so that the
> filesystem is consistent throughout the whole operation. This is most of why
> it's so much more efficient than add/delete.
Thanks for this
>> It's done now, and took close to 99 hours to rebalance 8.1 TB of data from a
>> 4x6TB raid1 (12 TB capacity) with 1 drive missing onto the remaining 3x6TB
>> raid1 (9 TB capacity).
>
> Indeed, it not clear why it takes 4 days for such an action. You
> indicated that you cannot add an online
hat would be a lot more efficient, but it would go against the
normal chunk assignment strategy.
Cheers, boli
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e).
If you know any DOs/DON'Ts please share. :)
Ofc I'll keep reporting any new developments. And should this replacement of
the first of 4 drives turn end well, I'll replace the second drive with the
"btrfs replace" option instead of delete/add and report.
Cheers, boli
--
To u
On 09.06.2016, at 17:20, Duncan <1i5t5.dun...@cox.net> wrote:
> Are those the 8 TB SMR "archive" drives?
No, they are Western Digital Red drives.
Thanks for the detailed follow-up anyway. :)
Half a year ago, when I evaluated hard drives, in the 8 TB category there were
only the Hitachi 8 TB
house
and my upstream is only 50 Mbit/s.
Also thanks to Hugo and Duncan for their awesome/insightful replies to my first
question a few months ago (didn't want to spam the list just to say thanks).
Best regards, boli--
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wo
pairs, or four-way, or …
Cheers, boli--
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