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Re: btrfs across a mix of SSDs & HDDs



On 05/02/2012 06:28 AM, Fajar A. Nugraha wrote:
On Wed, May 2, 2012 at 9:22 AM, Bardur Arantsson<spam@xxxxxxxxxxxxxxx>  wrote:
On 05/01/2012 09:35 PM, Martin wrote:


 From Kconfig:

   "Btrfs filesystem (EXPERIMENTAL) Unstable disk format"
                      ^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^^

Btrfs is too immature to use in ANY kind of production-like scenario where
you cannot afford to lose a certain amount of data (i.e. be forced to
restore from backup) AND suffer downtime.

I don't think email users are going to be thrilled about the prospect of
"lossy" email.

Oracle fully supports btrfs for production environment:
http://oss.oracle.com/ol6/docs/RELEASE-NOTES-UEK2-en.html
http://www.zdnet.com/blog/open-source/oracles-unbreakable-enterprise-kernel-2-arrives-with-linux-30-kernel-btrfs/10588
http://www.oracle.com/us/technologies/linux/index.html


What does "fully supports" mean? Does it mean that it's actually stable (considerably more stable that mainline), or does it mean that you can pay them to help fix a broken FS, for example? Does the included btrfsck actually work reliably? Is there some non-legalese official statement of what, exactly, "fully supported" means and whether OL's btrfs falls under this rubric?

Also, AFAIUI the 3.0.x kernels (which OL claims to use in the release notes) are woefully outdated wrt. btrfs reliability/stability. Have all the more recent stability improvements been backported?

Is the OP using Oracle Linux?

Given the semi-regular posts about FS corruption on this list(*) and the "EXPERIEMENTAL" status in the KConfig it would be unwise to use btrfs for anything called "production" (unless you can actually afford downtime/data loss).


(*) I want to make clear that the developers on this list always seem incredibly responsive and helpful when these posts occur, but it's still an indication of not-readiness for "production". File systems always take quite a long time to mature, it's just the nature of the beast.

Regards,

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