Hey, On 11/17/2016 02:27 AM, Qu Wenruo wrote: > > At 11/17/2016 04:30 AM, Hans van Kranenburg wrote: >> In the last two days I've added the --blockgroup option to btrfs heatmap >> to let it create pictures of block group internals. >> >> Examples and more instructions are to be found in the README at: >> https://github.com/knorrie/btrfs-heatmap/blob/master/README.md >> >> To use the new functionality it needs a fairly recent python-btrfs for >> the 'skinny' METADATA_ITEM_KEY to be present. Latest python-btrfs >> release is v0.3, created yesterday. >> > Wow, really cool!
Thanks! > I always dream about a visualizing tool to represent the chunk and > extent level of btrfs. > > This should really save me from reading the boring dec numbers from > btrfs-debug-tree. > > Although IMHO the full fs output is mixing extent and chunk level > together, which makes it a little hard to represent multi-device case, > it's still an awesome tool! The picture of a full filesystem just appends all devices together into one big space, and then walks the dev_extent tree and associated chunk/blockgroup items for the %used/greyscale value. I don't see what displaying a blockgroup-level aggregate usage number has to do with multi-device, except that the same %usage will appear another time when using RAID1*. When generating a picture of a file system with multiple devices, boundaries between the separate devices are not visible now. If someone has a brilliant idea about how to do this without throwing out actual usage data... -- Hans van Kranenburg -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
