Identical CKSUM errors across all 7 drives in a raidz1

[etorix]

Then it is time to backup the remaining 80% if the pool is still mounted (hopefully so).

For rebuilding, note that your raidz1 is too wide for comfort; consider raidz2.
And check these SATA controllers: No port multiplier, no JMicron… (9300-8i HBAs are cheap)

Multiply your problems with SATA Port Multipliers and cheap SATA controllers

This resource was originally created by user: jgreco on the TrueNAS Community Forums Archive. Please DM this account or comment in this thread to claim it. In the last year or two, we’ve had a resurgence of users asking about SATA Port Multipliers and cheap SATA controllers. Please, do NOT use port multipliers, and use cheap SATA controllers only after extensive research. SATA controllers and SATA Port Multipliers are some of the cheapest hardware, designed to make a number of hard drives acc…