Re: [Xen-users] Cheap IOMMU hardware and ECC support importance

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 06/29/2014 08:44 AM, lee wrote:
> Kuba <kuba.0000@xxxxx> writes:
>
> > Each time data is read from the disk, it is checksummed and the
> > checksum is compared with the value stored with the data. This way you
> > know whether data you just read is good or not, not just that it had
> > been written correctly. Take a look here for example, slides 12-16:
> >
> > http://wiki.illumos.org/download/attachments/1146951/zfs_last.pdf
> >
> > It's a little bit outdated and Solaris-centric, but might give you
> > some overview.
> Still very interesting, thanks :)  I think I should learn more about
> it.  Does it still need fuse, and can you boot from it?
There is a fuse implementation, but it is somewhat abandoned these days. 
I still use it on my 32-bit systems (e.g. ARM) because ZoL doesn't play 
well on 32-bit platforms due to lack of kernel virtual memory space 
which the original Solaris ZFS implementation that most others are based 
on uses copiously.
You _can_ boot from it if you _really_ want to, but you have to patch 
grub to make it work and personally I wouldn't recommend it, although 
many people over on the ZoL mailing list use it. I prefer my rootfs on 
ext4 since it makes certain recovery modes easier, and the rootfs is 
small and easy enough to back up and restore and sees very little 
activity after booting on most of my servers. I don't think booting of 
it is worth the extra complication.

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