- The format of the entries in the first column, roughly, defines a substring search on the Vendor Name and the Device Model as returned by the device to appropriate inquiries.
- Note also that this change is not required to persist if you're immediately using the disk with overridden options to create or change a ZFS pool: after the
ashiftvalue gets into the label, it is used regardless of the driver options. This may be important on systems such as VMs, where you have (seemingly) identical disk models which you want to use in different manners.
The change needs to persist if the disk usage will be delayed – for example, if the disk requiring an override is a designated hot-spare for a pool.
- Other overrides can be set, see the the
sd(7D)man page. An increasingly useful tunable is the
"power-condition:false"that can be set on HDDs for which the vendor has enabled power savings mode in the HDD firmware configuration.