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RAID would only be able to recover if it KNEW the data was wrong. Without a checksum, hardware RAID has no way to KNOW it needs to use the parity to correct the block.

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The "M" at the end of that revision number suggests a "modified" tree, meaning they had their own patches that were not part of the upstream repository as well.

ZFS has supported online adding of vdevs since the start too, this is specifically modifying an existing vdev and widening it, which is much less common, and much more complex

There are advantages to doing the cloning at the block level, rather than the VFS layer. The feature was originally written for FreeBSD using the copy_file_range() syscall, then ex…

There are a few different use cases, but cloning a VM image file is definitely a popular one. Also, `mv` between different filesystems in the same ZFS pool. Traditionally when cros…

It is, except it lets you do it as a sub-file level. You can clone a (block aligned) byte range of a file using the copy_file_range() syscall

That is not how this will work. The reason the parity ratio stays the same, is that all of the references to the data are by DVA (Data Virtual Address, effectively the LBA within t…

A post where we discuss some strategies and tools to make managing disk arrays on FreeBSD (and related platforms like TrueNAS Core) much easier. These concepts also apply to other …

This was a bug in ZFS itself, and was resolved years ago: https://smartos.org/bugview/OS-6404 In FreeBSD 12.x and older, you could opt out of using UMA with: vfs.zfs.zio.use_uma=0,…

The metadata of the zvol on the host pool, does benefit from the metadata vdev (NOT A CACHE)

The metadata vdev is not a cache, it is the primary store. Too many years of thinking of the aux vdev types like SLOG and L2ARC as caches, has made people confuse this one frequent…

In previous talks Netflix has mentioned that due to serving so many 1000s of people from each box, that they basically do 0 caching in memory, all of the system memory is needed fo…

The videos should appear on the conference's youtube channel in a few weeks: https://www.youtube.com/eurobsdcon

I think the implication is: TCP kind of assumed you will either keep transmitting, or close the connection. The many video-streaming type workloads, the connection will go idle, fo…

Integrated with Kernel, vs not. Other tools in the OS that can take advantage of ZFS, vs not.

For example, on Solaris and FreeBSD, it is possible to force-unmount a filesystem. on Linux it is not.

Sure, the ZFS features are the same, but the integration is still not all there on Linux, and is on FreeBSD. FreeBSD has features like 'bootonce', to switch ZFS boot environments o…

VIMAGE / VNET, which allow you to have an instance of pf for each jail. Very useful

iianm, Solaris has a port of IPF, not pf. Oracle is working on trying to port pf now.

Is it really though? It is running on top of a stripped down version of Redhat.

You can always email the guest. We include the guest's contact details in every episode's show notes.

This is one of the reasons for the existence of the 'toor' user, which still uses the default shell