Data drive issue cause Web GUI to stop?

[jimmypooh]

Found out that I have some issues with what looks like 2 of my disks on Raid Z1. This happens after a while, each time I restart the system.
System runs fine for about 12 hours.
smartd shows:

/dev/ada1, 64 Currently unreadable (pending) sectors
/dev/ada1, 64 Offline uncorrectable sectors

This does not really cause any problems and FreeNas still says the pool is healthy.

However later in the day:

ada0 detaches. I think once that happens is when the web gui stops responding and all the shares are not working.

I'll try fixing the sectors on the drive. I'm fairly new to FreeBSD but I'll try to muddle my way through it. Does anyone have any good tutorials? Am I going down the right path?
Why would this cause the web GUI to stop responding?

Thanks!!!

Below is what I get after the GUI stops reacting.

 

[cyberjock]

ada1 definitely should be replaced. ada0 may or may not, there's not enough info to tell you for certain.

What I am fairly certain of is that when you go to replace your disk there's a reasonable chance you're going to lose some files or lose the pool. Why is this? Because you appear to have 2 failing disks in a pool designed to handle single disk failure.