Freebsd – How to specify the path which is to be tested using iozone

freebsdiopsiozonezfs

I have a freebsd install which has ufs filesystem. Inside freebsd i have created a zpool in raidz1. Now i want to perform iozone test on zfs but i am not able to understand how to specify that iozone test on the zpool not the base filesystem.

Best Answer

iozone will operate in the current directory by default. If you wish to test your ZFS pool, change directories to the relevant directory containing the pol or child filesystems, then execute iozone.

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FreeBSD – Fix ZFS Pool Not Automatically Mounted

Sounds like your ZFS isn't enabled in rc.conf...

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The problem was that the new motherboard's BIOS created a host protected area (HPA) on some of the drives, a small section used by OEMs for system recovery purposes, usually located at the end of the harddrive.

ZFS maintains 4 labels with partition meta information and the HPA prevents ZFS from seeing the upper two.

Solution: Boot Linux, use hdparm to inspect and remove the HPA. Be very careful, this can easily destroy your data for good. Consult the article and the hdparm man page (parameter -N) for details.

The problem did not only occur with the new motherboard, I had a similar issue when connecting the drives to an SAS controller card. The solution is the same.

Best Answer

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FreeBSD – Fix ZFS Pool Not Automatically Mounted

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