How do I grow zfs filesystem?
reddit / freebsd

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[deleted] · 2020-11-06 10:27

[deleted]

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FUZxxl · 2020-11-06 10:43

See the zpool manpage.  There should be a `zpool grow` or something
command.

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dddddavidddd · 2020-11-06 10:54

What you can also do is set up & experiment with a test zpool that is
file-based (e.g. 200 MB files for each 'device'). I did this to figure
out how to grow my mirror.

In my case, I just set the [autoexpand](https://docs.oracle.com/cd/E19
253-01/819-5461/githb/index.html) property, replaced the device,
removed the old one, and resilvered. (Again, I suggest trying it all
out on a zero-risk test zpool first before doing it on real data.)

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vermaden · 2020-11-06 10:55

Before:

    # zfs list storage
    NAME    USED  AVAIL REFER MOUNTPOINT
    storage 3.21T 820G  236K  /storage

First you have to make sure that **autoexpand** is on as follows.

    # zpool get autoexpand storage
    NAME    PROPERTY   VALUE SOURCE
    storage autoexpand off   default

Set it to **on**.

    # zpool set autoexpand=on storage
    NAME    PROPERTY   VALUE SOURCE
    storage autoexpand on    local

Check **expandsize**.

    # zpool get expandsize storage
    NAME    PROPERTY   VALUE SOURCE
    storage expandsize 2.27T -

 To make it use that space you need do **zpool online -e** for all
replaced devices:

    # zpool online -e storage wwn-0x5000c500654c1adc
    # zpool online -e storage wwn-0x5000c500652efbc2

 ... and now:

    # zfs list storage
    NAME    USED  AVAIL REFER
    storage 3.21T 3.04T 236K  /storage

Done.

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Xzenor · 2020-11-06 10:58

Actually, no. The only time the word 'grow' is used in the man page is
for for the autoexpand option, which is already on.

But your hint made me look a bit further and I searched for 'expand'
in the manpage and eventually ended up with the following:

zpool online -e poolname diskname

which actually works, surprisingly. So weird that I could not find
this before. I guess I just skipped the 'online' option because the
disk is already online..

Thanks

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Xzenor · 2020-11-06 11:04

>To make it use that space you need do
>
>zpool online -e
>
> for all replaced devices:

That's what I completely missed.  I just dismissed it, the disk was
already online so why put it online again. But it worked.

Well, I'm never gonna forget this again...

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Xzenor · 2020-11-06 11:11

I didn't know you could make file-based pools. That's cool. It's not
necessary though, I can just add disks in ESX to test with but it's
nice to know this for other situations.

The autoexpand option was already set but I did not resilver. That
clears your entire disk, doesn't it?

it's fixed btw by using "zpool online **-e**" but I'm still curious.

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dddddavidddd · 2020-11-06 13:57

On second though, I'd mean to scrub rather than resilver; the `man`
page notes that the operations are very similar. Good to know about
the `-e` flag.