When you create an OVH Public Cloud instance under Freebsd with a certain amount of disk space, let’s say 50G, you will find that it is not applied on your partition.
First let’s look at what we have:
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# gpart show
=> 40 10239920 da0 GPT (50G) [CORRUPT]
40 1024 1 freebsd-boot (512K)
1064 984 - free - (492K)
2048 10235904 2 freebsd-zfs (4.9G)
10237952 2008 - free - (1.0M)
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We note that our volume da0 is tagged as CORRUPT. Don’t panic, everyone knows that the Freebsd handbook is great. I quote:
If the disk was formatted with the GPT partitioning scheme, it may show as “corrupted” because the GPT backup partition table is no longer at the end of the drive. Fix the backup partition table with gpart:
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# gpart recover ada0
ada0 recovered
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Well, let’s apply this to our server by replacing ada0 by da0 :
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# gpart recover da0
da0 recovered
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Check :
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# gpart show
=> 40 104857520 da0 GPT (50G)
40 1024 1 freebsd-boot (512K)
1064 984 - free - (492K)
2048 10235904 2 freebsd-zfs (4.9G)
10237952 94619608 - free - (45G)
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Much better!
We see that our da0 “disk” has 50G. However if we look more closely at our system, we see that not all the space is present.
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# df -h
Filesystem Size Used Avail Capacity Mounted on
zroot/ROOT/default 4.7G 493M 4.2G 10% /
devfs 1.0K 1.0K 0B 100% /dev
zroot 4.2G 96K 4.2G 0% /zroot
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Once again, don’t panic. The handbook is our friend.
Let’s apply the 45G free on our score :
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# gpart resize -i 2 -a 4k -s 50G da0
da0p2 resized
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Check :
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# gpart show
=> 40 104857520 da0 GPT (50G)
40 1024 1 freebsd-boot (512K)
1064 984 - free - (492K)
2048 94371840 2 freebsd-zfs (45G)
94373888 10483672 - free - (5.0G)
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Well, we are moving forward, however, the space is not yet usable as the return from df :
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# df -h
Filesystem Size Used Avail Capacity Mounted on
zroot/ROOT/default 4.7G 493M 4.2G 10% /
devfs 1.0K 1.0K 0B 100% /dev
zroot 4.2G 96K 4.2G 0% /zroot
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We must ask to our zpool to use this space.
Let’s first check our pool.
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# zpool status
pool: zroot
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
da0p2 ONLINE 0 0 0
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Ask it we want to autoexpand on zroot
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# zpool set autoexpand=on zroot
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Apply it on da0p2 :
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# zpool online -e zroot /dev/da0p2
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Last check :
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# df -h
Filesystem Size Used Avail Capacity Mounted on
zroot/ROOT/default 44G 493M 43G 1% /
devfs 1.0K 1.0K 0B 100% /dev
zroot 43G 96K 43G 0% /zroot
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This is it !