ZFS...

[Miroslav Lachman]

Pete French wrote on 2019/05/03 14:28:
> 
> 
> On 03/05/2019 13:11, Miroslav Lachman wrote:
> 
>> I had this problem in the past too. I am not sure if it was on Dell or 
>> HP machine - controller presents first disk only in the boot time so I 
>> created small (10 - 15GB partition) on each disk and use them all in 4 
>> way mirror. Cannot say if it was gmirror with UFS or ZFS mirroring. 
>> The rest of the each disk was used for ZFS RAIDZ.
> 
> Snap :-) Thats exactly what I have done - but the bits you cant mirror 
> are the GPT partititons for bootcode. I was fiddling with hose of da0 
> without realising it was now using da1 to boot. If it ever chooses da2 
> or da3 then I will need to mirror it there too, so I have it partitioned 
> like that, but am currently using those as swap as it shows no signs of 
> wanting to boot from them for now.

Time for some scripting :) This is what I have on the machine with weird 
controller

# cat bin/zfs_bootcode_update.sh
#!/bin/sh

devs="ada0 ada1 ada2 ada3"

for dev in $devs
do
         echo -n "Updating ZFS bootcode on ${dev} ..."
         if ! /sbin/gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 
1 ${dev} > /dev/null; then
                 echo " error"
                 exit 1
         fi
         echo " done"
done

So it should be able to boot from any installed drive, no matter the order.

Miroslav Lachman