zpool failmode

У zpool есть одна из опций – failmode. Это поведение на внезапное исчезновение диска пула. Стандартное значение – это wait:

# zpool get failmode dpool
NAME   PROPERTY  VALUE     SOURCE
rpool  failmode  continue  local

Бывают моменты, когда это значение нужно изменить: например, в зеркальном рейде лучше поставить значение continue:

# zpool set failmode=continue dpool
# zpool get failmode dpool
NAME   PROPERTY  VALUE     SOURCE
rpool  failmode  continue  local

Доступные значения ниже:

failmode=wait | continue | panic

    Controls the system behavior  in  the  event  of  catas-
    trophic  pool  failure.  This  condition  is typically a
    result of a  loss  of  connectivity  to  the  underlying
    storage device(s) or a failure of all devices within the
    pool. The behavior of such an  event  is  determined  as
    follows:

    wait        Blocks all I/O access until the device  con-
                nectivity  is  recovered  and the errors are
                cleared. This is the default behavior.

    continue    Returns EIO to any new  write  I/O  requests
                but  allows  reads  to  any of the remaining
                healthy devices.  Any  write  requests  that
                have  yet  to  be committed to disk would be
                blocked.

    panic       Prints out a message to the console and gen-
                erates a system crash dump.