Plesk mod_fcgid + php flush() function enable

I set following option in /etc/httpd/conf.d/fcgid.conf file which solves the problem generally (but it would not when Plesk is installed):
OutputBufferSize 0

Try to configure OutputBufferSize option for the exact domain, for this create vhost.conf file
in domain document root (usually /var/www/vhost/domain.tld/conf folder), add OutputBufferSize
option with necessary value there and run

/usr/local/psa/admin/sbin/websrvmng -a -v

FreeNAS failed to wipe: Operation not permitted

Quick Fix

On step 3 be sure to replace ‘/dev/ada4′ with your drive reference. In the ‘view disks’ tab it will be the ‘name’ prepended with ‘/dev/’.

1. Login via SSH
2. sysctl kern.geom.debugflags=0x10
3. dd if=/dev/zero of=/dev/ada4 bs=512 count=1 && dd if=/dev/zero of=/dev/ada5 bs=512 count=1
4. Log into web interface and use “View Disks” to wipe the drives in that interface
5. Create new ZFS volume including these disks.