[rescue] The State of SunHELP (new server build, etc)

Phil Stracchino phils at caerllewys.net
Sun Jun 16 16:04:11 CDT 2019

On 6/16/19 3:33 PM, Andrew Jones wrote:
> On 6/14/19 7:51 PM, Bob Darlington wrote:
>> zfs raidz specifically eliminates the write-hole issues.  On the smallest
>> of my systems I'm running 20 8TB disks raidz3 with a hot spare, times 4 for
>> 84 disks in the jbod, and typically 4 of these craptastic seagate jbods to
>> a server.  I can't vouch for smaller systems, but I will say my stuff is
>> fairly quick.  Here's some of the settings...
> Regular ol' Linux mdraid + lvm + xfs also eliminates the write hole, and 
> doesn't require any third party out-of-tree drivers with questionable 
> licensing.
> mdraid + lvm + xfs use the hardware write barrier support built into 
> Linux device drivers, because the whole stack is meant to work together.
> Speaking of which: does ZFS-on-Linux support the hardware write barriers 
> at all?
> I know it did on Solaris, but ZFSoL is a different animal.

Those interested in this question may find bcachefs to be of interest.

  Phil Stracchino
  Babylon Communications
  phils at caerllewys.net
  phil at co.ordinate.org
  Landline: +1.603.293.8485
  Mobile:   +1.603.998.6958

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