Re: 40TB volume taking over 16 hours to mount, any ideas?

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On Aug 10, 2014, at 2:24 AM, Duncan <1i5t5.duncan@xxxxxxx> wrote:
> 
> Either way, the question then comes up of what to use when you do a new 
> mkfs.  My personal feeling?  Btrfs isn't yet fully stable, and there's a 
> very real possibility that one may have to restore from backup, so one 
> should be prepared for that.

Jose said early on he that he is prepared for this, but nevertheless a week is a rather long time for restore.

>  Given the size of the data store you're 
> working with and the remote nature of that backup, with access over 
> limited-speed pipes, I wonder if btrfs is really an appropriate choice 
> for you at this point.

We don't know if this backup is extra icing on the cake. Yes it's a week of restore, but it still might be entirely dispensable; e.g. 1 of 2+ glusterfs georep slaves and at least one of the others is XFS based.

> I guess xfs is the standard recommendation for big-data sizes and it is 
> said to be long past the "better have a UPS" days, or of course the 
> default ext4.  

XFS is now the default filesystem for RHEL 7 and Fedora 21 Server, likely also for Fedora 21 Cloud. This includes /boot.

> 
> You can of course try btrfs again in a year or so, when it should have 
> matured quite a bit.  I actually did that after my first try at btrfs, 
> leaving for a time then coming back, and was impressed at how much it had 
> matured in the mean time.

I'm looking back to Aug 2011 when Fedora 16 was slated to have Btrfs by default.


Chris Murphy

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