[SOLVED]ZFS: feature 'lz4_compression' unsupported by kernel

[wagnertheclown]

Hello! I hope this is the right category to ask this; if not, please let me know.

I have installed ZFS as described in the Gentoo Wiki here with Gentoo kernel version 5.10.27.

I seem to be able to create zpools just fine via

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zpool create

but when I try to explicitly create a zpool with compression enabled (e.g., "-o feature@lz4_compression=enabled"), I get this error message:

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cannot create 'tank': feature 'lz4_compression' unsupported by kernel

I thought this strange, since I followed the recommended kernel configurations in the aforementioned Wiki article. I went back and made sure that LZ4 was enabled:

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# grep LZ4 /usr/src/linux/.config
CONFIG_HAVE_KERNEL_LZ4=y
# CONFIG_KERNEL_LZ4 is not set
CONFIG_RD_LZ4=y
CONFIG_CRYPTO_LZ4=y
CONFIG_CRYPTO_LZ4HC=y
CONFIG_LZ4_COMPRESS=y
CONFIG_LZ4HC_COMPRESS=y
CONFIG_LZ4_DECOMPRESS=y
CONFIG_DECOMPRESS_LZ4=y

I made sure that the LZ4 package was installed too:

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# grep lz4 /var/lib/portage/world
app-arch/lz4

When I look at dmesg while I run the failing create command (dmesg -w), I only see this:

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[ 5773.453660]  sdb: sdb1 sdb9
[ 5773.764591]  sdc: sdc1 sdc9
[ 5773.766770]  sdc: sdc1 sdc9

This is the full creation command I am trying to run:

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# zpool create -o feature@lz4_compression=on tank mirror <disk1> <disk2>

My questions:

- why is this happening?
- how can this error be solved?

General system information:

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# uname -r
5.10.27-gentoo

# zpool -V
zfs-2.0.0-rc1_466_g8a915ba1f
zfs-kmod-2.1.99-1

Thanks in advance!

[alamahant]

Hi
if you run
zfs set compression=lz4 pool-name
after creating it
?
Also the correct format is

-o feature@lz4_compress=enabled

NOT 'compression'

[wagnertheclown]

Hi
if you run
zfs set compression=lz4 pool-name
after creating it
?
Also the correct format is

-o feature@lz4_compress=enabled

NOT 'compression'

Thank you for the clarification. Here is what i ran next:

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# zpool create tank mirror <disks>
# zpool set compression=lz4 tank
cannot set property for 'tank': invalid property 'compression'

Following your clarification:

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# zpool create -o feature@lz4_compress=enabled test ...

Does not seem to produce any errors!

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# zpool get feature@lz4_compress test
                     NAME  PROPERTY              VALUE                 SOURCE
test  feature@lz4_compress  active                local

Wow, sorry for creating a whole thread for a PEBKAC error. I'll mark this as solved.

[Hu]

Wow, sorry for creating a whole thread for a PEBKAC error. I'll mark this as solved.

The error message could be better, perhaps by directing you to an authoritative list of valid names. Considering only what you showed, it looks like any unacceptable name is reported that way, regardless of whether the name could be made valid by using different kernel compilation options.