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Re: RAID60 question

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On 12/2/24 00:02, Jeffrey Walton wrote:
> On Sun, Dec 1, 2024 at 3:47 PM David Christensen
> <dpchrist@holgerdanske.com> wrote:
>>
>> On 12/1/24 04:27, Greg wrote:
>>> Hi there,
>>>
>>> I'm setting up MD-RAID0 on a top of HW-RAID6 devices (long story). I
>>> would like to confirm the following:
>>>
>>> 1. The RAID0 chunk size should be the stripe width of the
>>> underlying RAID6 volumes.
>>>
>>> 2. The RAID0 metadata should be at the end of the device (metadata ver.
>>> 1.0).
>>>
>>> 3. The stride and stripe-width of the ext4 fs should be set to the once
>>> used when creating RAID6 volumes.
>>
>> I have a SOHO network and I implemented file sharing many years ago.
>> Around 2019, I switched from md to ZFS.  The learning curve has been
>> non-trivial, but I am pleased with the results and expect ZFS will be a
>> better solution going forward.
>>
>>
>> Regarding data migration in general, my previous approach had been
>> in-place using one server and minimal disks (e.g. "cheap").  An operator
>> error on a prior migration resulted in loss of some archival backups.
>> So, I threw money at the problem this time around -- buy another server,
>> buy more disks, build the new server, migrate the data, make the new
>> server primary, rebuild the old server, and make the old server
>> secondary.  And, backups before, during, and after.  So, more time and
>> money, less risk, no data loss, and rebalanced data/ maximum performance
>> afterwards.
> 
> ???
> 
> What questions did you answer?
> 
> Jeff


I was providing anecdotal information for the OP and other readers to 
consider, because sometimes we lose sight of the forest for the trees.


David

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RAID60 question Greg <pld@sojka.co> - 2024-12-01 13:40 +0100
  Re: RAID60 question David Christensen <dpchrist@holgerdanske.com> - 2024-12-01 19:30 +0100
    Re: RAID60 question Greg <pld@sojka.co> - 2024-12-01 20:00 +0100
    Re: RAID60 question Jeffrey Walton <noloader@gmail.com> - 2024-12-02 09:10 +0100
      Re: RAID60 question David Christensen <dpchrist@holgerdanske.com> - 2024-12-03 01:40 +0100
  Re: RAID60 question Michael Paoli <michael.paoli@berkeley.edu> - 2024-12-02 04:50 +0100

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