.. _arcstorage_prilohy:

=======
Přílohy 
=======

Dokumentace API 
===========================
:download:`prilohy/apidoc.json`

Demonstrace samoléčení ZFS
==============================

Demonstrace probíhala při konfiguraci:
pool **arcpool** tvořen zrcadlenými disky /dev/sda5, /dev/sda6
dataset **test**

Poškození dat na jednom disku
------------------------------

1. Data manuálně poškozena na disku  /dev/sda5
2. Spuštěn scrubbing (distribuovaná kontrola kontrolních součtů celého úložiště a současná automatická oprava).
3. Při dotazu na stav úložiště lze vidět že scrubbing stále probíhá
4. Při pozdějším dotazu na stav již scrubbing doběhl

 * Data na disku /dev/sda5 byla opravena z disku  /dev/sda6
 * Report doporučuje kontrolu selhávajícího disku

.. code-block::

    root@honzator:/arcpool/test# dd if=/dev/urandom of=/dev/sda5 bs=1024 count=20480
    root@honzator:/arcpool/test# zpool scrub arcpool
    root@honzator:/arcpool/test# zpool status -v
    pool: arcpool
    state: ONLINE
    scan: scrub in progress since Sun Nov 17 16:54:33 2019
    76,4M scanned out of 299M at 19,1M/s, 0h0m to go
    0B repaired, 25,54% done
    config:

    NAME        STATE     READ WRITE CKSUM
    arcpool     ONLINE       0     0     0
        mirror-0  ONLINE       0     0     0
        sda5    ONLINE       0     0     0
        sda6    ONLINE       0     0     0

    errors: No known data errors
    root@honzator:/arcpool/test# zpool status -v
    pool: arcpool
    state: ONLINE
    status: One or more devices has experienced an unrecoverable error.  An
    attempt was made to correct the error.  Applications are unaffected.
    action: Determine if the device needs to be replaced, and clear the errors
    using 'zpool clear' or replace the device with 'zpool replace'.
    see: http://zfsonlinux.org/msg/ZFS-8000-9P
    scan: scrub repaired 32K in 0h0m with 0 errors on Sun Nov 17 16:54:50 2019
    config:

    NAME        STATE     READ WRITE CKSUM
    arcpool     ONLINE       0     0     0
        mirror-0  ONLINE       0     0     0
        sda5    ONLINE       0     0     8
        sda6    ONLINE       0     0     0

    errors: No known data errors


Poškození dat na obou discích
------------------------------

1. Data manuálně poškozena na disku  /dev/sda5
2. Data manuálně poškozena na disku  /dev/sda6
3. Spuštěn scrubbing
4. Dotaz na stav úložiště zobrazuje soubory jenž nebylo možné obnovit

.. code-block::

    root@honzator:/arcpool/test# dd if=/dev/urandom of=/dev/sda5 bs=1024 count=20480
    root@honzator:/arcpool/test# dd if=/dev/urandom of=/dev/sda6 bs=1024 count=20480
    root@honzator:/arcpool/test# zpool scrub arcpool
    root@honzator:/arcpool/test# zpool status -v
    pool: arcpool
    state: DEGRADED
    status: One or more devices has experienced an error resulting in data
        corruption.  Applications may be affected.
    action: Restore the file in question if possible.  Otherwise restore the
        entire pool from backup.
    see: http://zfsonlinux.org/msg/ZFS-8000-8A
    scan: scrub repaired 400K in 0h0m with 124 errors on Sun Nov 17 16:57:08 2019
    config:

        NAME        STATE     READ WRITE CKSUM
        arcpool     DEGRADED     0     0   124
        mirror-0  DEGRADED     0     0   284
            sda5    DEGRADED     0     0   292  too many errors
            sda6    DEGRADED     0     0   284  too many errors

    errors: Permanent errors have been detected in the following files:

            /arcpool/test/arclib/06/9f/d0/069fd041-2a15-434f-b078-e728400ecc77_xml_1
            /arcpool/test/arclib/35/96/0f/35960f03-13d4-4bf1-bec6-9bccf76f661f.SHA512