Because I have had trouble with the way ZFS on Linux (ZOL) handles failing drives, I have decided to create a software
RAID set of my drives before creating my zpool.<\/p>\n\n\n\n
This means that my zpool is created with a single device (\/dev\/md0). If I remember correctly, it was created like this:<\/p>\n\n\n\n
zpool create pool0 md0<\/code><\/pre>\n\n\n\nEXPANSION:<\/h2>\n\n\n\n
By default pool\u2019s are not set to autoexpand so it is needed to set the autoexpand to on:<\/p>\n\n\n\n
zpool set autoexpand=on pool0<\/code><\/pre>\n\n\n\nBefore I could get the pool expanded I needed to grow my RAID set. It is done by first adding a device to the existing
RAID set and then \u201cgrowing\u201d it with the new amount of devices.<\/p>\n\n\n\n
mdadm \/dev\/md0 --add \/dev\/sdd\nmdadm --grow \/dev\/md0 --raid-devices=4<\/code><\/pre>\n\n\n\nAfter the RAID set have reshaped, the extra space is available for use. According to all information I could find, it should be possible to expand the pool by either exporting and importing it<\/p>\n\n\n\n
zpool export pool0\nzpool import pool0<\/code><\/pre>\n\n\n\nor by expanding the online pool<\/p>\n\n\n\n
zpool online -e pool0 md0<\/code><\/pre>\n\n\n\nI tried both several times and in different order, but to no avail. My pool was fixed at its original size.<\/p>\n\n\n\n
REBOOT:<\/h2>\n\n\n\n
Finally I decided to do a reboot to see if that would change anything. Remember to save the new mdadm configuration before rebooting.<\/p>\n\n\n\n
# Remove existing array configuration from mdadm.conf file\ngrep -v ARRAY \/etc\/mdadm\/mdadm.conf > \/tmp\/mdadm.conf\n# Add new array configuration to mdadm.conf\ncat \/tmp\/mdadm.conf > \/etc\/mdadm\/mdadm.conf\nmdadm --examine --scan >> \/etc\/mdadm\/mdadm.conf<\/code><\/pre>\n\n\n\nAfter the reboot, the pool was still the original size, but now it actually worked to do an online expansion.<\/p>\n\n\n\n
zpool online -e pool0 md0<\/code><\/pre>\n\n\n\nAnd that solved the problem. Unfortunately I do not know why I could not perform the online expansion without a reboot.<\/p>\n","protected":false},"excerpt":{"rendered":"
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