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====== ZFS Nyomozás ======
===== Pool állapotának lekérdezése =====
  * <code bash>
zpool status -stvD
</code><code>
  pool: backup_pool
 state: ONLINE
  scan: none requested
config:

        NAME                                                           STATE     READ WRITE CKSUM  SLOW
        backup_pool                                                    ONLINE       0     0     0     -
          mirror-0                                                     ONLINE       0     0     0     -
            ata-WDC_WD60EZAZ-00SF3B0_WD-WX22D51FH5N3-part1             ONLINE       0     0     0     0  (untrimmed)
            ata-WDC_WD60EZAZ-00SF3B0_WD-WX42D611KJ3K-part1             ONLINE       0     0     0     0  (untrimmed)
        logs
          mirror-1                                                     ONLINE       0     0     0     -
            nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937831T-part4  ONLINE       0     0     0     0  (untrimmed)
            nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937938H-part4  ONLINE       0     0     0     0  (untrimmed)
        cache
          nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937831T-part3    ONLINE       0     0     0     0  (untrimmed)
          nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937938H-part3    ONLINE       0     0     0     0  (untrimmed)

errors: No known data errors

  pool: data_pool
 state: ONLINE
  scan: scrub repaired 0B in 0 days 00:40:26 with 0 errors on Sun Dec 12 01:04:27 2021
config:

        NAME                                                           STATE     READ WRITE CKSUM  SLOW
        data_pool                                                      ONLINE       0     0     0     -
          mirror-0                                                     ONLINE       0     0     0     -
            ata-WDC_WD1005FBYZ-01YCBB2_WD-WMC6M0D0NFEE-part1           ONLINE       0     0     0     0  (trim unsupported)
            ata-WDC_WD1005FBYZ-01YCBB2_WD-WMC6N0L2TXDR-part1           ONLINE       0     0     0     0  (trim unsupported)
        logs
          mirror-1                                                     ONLINE       0     0     0     -
            nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937831T-part2  ONLINE       0     0     0     0  (untrimmed)
            nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937938H-part2  ONLINE       0     0     0     0  (untrimmed)
        cache
          nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937831T-part1    ONLINE       0     0     0     0  (untrimmed)
          nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937938H-part1    ONLINE       0     0     0     0  (untrimmed)

errors: No known data errors
</code>


===== Cachek állapotának lekérdezése =====
  * Minden olvasási cache infó: <code bash>
arc_summary
</code>
  * Olvasási L1 cache (RAM): <code bash>
arc_summary -s arc
</code><code>
------------------------------------------------------------------------
ZFS Subsystem Report                            Wed Dec 15 09:48:44 2021
Linux 5.4.0-91-generic                                0.8.3-1ubuntu12.13
Machine: server (x86_64)                              0.8.3-1ubuntu12.13

ARC status:                                                      HEALTHY
        Memory throttle count:                                         0

ARC size (current):                                    99.0 %    9.2 GiB
        Target size (adaptive):                       100.0 %    9.3 GiB
        Min size (hard limit):                         20.0 %    1.9 GiB
        Max size (high water):                            5:1    9.3 GiB
        Most Frequently Used (MFU) cache size:          3.9 %  346.4 MiB
        Most Recently Used (MRU) cache size:           96.1 %    8.4 GiB
        Metadata cache size (hard limit):              75.0 %    7.0 GiB
        Metadata cache size (current):                  9.8 %  702.1 MiB
        Dnode cache size (hard limit):                 10.0 %  715.3 MiB
        Dnode cache size (current):                    17.4 %  124.6 MiB

ARC hash breakdown:
        Elements max:                                               1.5M
        Elements current:                              92.1 %       1.4M
        Collisions:                                                 3.1M
        Chain max:                                                     6
        Chains:                                                   182.2k

ARC misc:
        Deleted:                                                   10.6M
        Mutex misses:                                                253
        Eviction skips:                                            32.2k
</code>
  * Olvasási L2 cache (disk) <code bash>
arc_summary -s l2arc
</code><code>
------------------------------------------------------------------------
ZFS Subsystem Report                            Wed Dec 15 09:48:57 2021
Linux 5.4.0-91-generic                                0.8.3-1ubuntu12.13
Machine: server (x86_64)                              0.8.3-1ubuntu12.13

L2ARC status:                                                    HEALTHY
        Low memory aborts:                                             0
        Free on write:                                              2.9k
        R/W clashes:                                                   0
        Bad checksums:                                                 0
        I/O errors:                                                    0

L2ARC size (adaptive):                                         154.0 GiB
        Compressed:                                    79.2 %  121.9 GiB
        Header size:                                    0.1 %  109.0 MiB

L2ARC breakdown:                                                    3.6M
        Hit ratio:                                      4.2 %     151.2k
        Miss ratio:                                    95.8 %       3.4M
        Feeds:                                                     46.8k

L2ARC writes:
        Writes sent:                                    100 %   23.2 KiB

L2ARC evicts:
        Lock retries:                                                 11
        Upon reading:                                                  0
</code>
  * Olvasás cache-elésének sikeressége: <code bash>
arc_summary -s archits
</code><code>
------------------------------------------------------------------------
ZFS Subsystem Report                            Wed Dec 15 09:49:07 2021
Linux 5.4.0-91-generic                                0.8.3-1ubuntu12.13
Machine: server (x86_64)                              0.8.3-1ubuntu12.13

ARC total accesses (hits + misses):                                47.4M
        Cache hit ratio:                               92.5 %      43.8M
        Cache miss ratio:                               7.5 %       3.6M
        Actual hit ratio (MFU + MRU hits):             92.3 %      43.7M
        Data demand efficiency:                        77.5 %       3.9M
        Data prefetch efficiency:                       1.9 %       2.4M

Cache hits by cache type:
        Most frequently used (MFU):                    87.7 %      38.4M
        Most recently used (MRU):                      12.0 %       5.3M
        Most frequently used (MFU) ghost:               0.3 %     134.7k
        Most recently used (MRU) ghost:                 0.2 %      78.4k

Cache hits by data type:
        Demand data:                                    6.9 %       3.0M
        Demand prefetch data:                           0.1 %      45.3k
        Demand metadata:                               92.6 %      40.6M
        Demand prefetch metadata:                       0.4 %     167.1k

Cache misses by data type:
        Demand data:                                   24.8 %     882.0k
        Demand prefetch data:                          66.5 %       2.4M
        Demand metadata:                                6.5 %     231.8k
        Demand prefetch metadata:                       2.2 %      79.3k
</code>


===== OI Stat =====
  * Pillanatnyi IO állapot: <code bash>
zpool iostat -vly 1
</code><code>
                                                                 capacity     operations     bandwidth    total_wait     disk_wait    syncq_wait    asyncq_wait  scrub   trim
pool                                                           alloc   free   read  write   read  write   read  write   read  write   read  write   read  write   wait   wait
-------------------------------------------------------------  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
backup_pool                                                     893G  4.58T      0      0      0      0      -      -      -      -      -      -      -      -      -      -
  mirror                                                        893G  4.58T      0      0      0      0      -      -      -      -      -      -      -      -      -      -
    ata-WDC_WD60EZAZ-00SF3B0_WD-WX22D51FH5N3-part1                 -      -      0      0      0      0      -      -      -      -      -      -      -      -      -      -
    ata-WDC_WD60EZAZ-00SF3B0_WD-WX42D611KJ3K-part1                 -      -      0      0      0      0      -      -      -      -      -      -      -      -      -      -
logs                                                               -      -      -      -      -      -      -      -      -      -      -      -      -      -      -      -
  mirror                                                        896K  9.50G      0      0      0      0      -      -      -      -      -      -      -      -      -      -
    nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937831T-part4      -      -      0      0      0      0      -      -      -      -      -      -      -      -      -      -
    nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937938H-part4      -      -      0      0      0      0      -      -      -      -      -      -      -      -      -      -
cache                                                              -      -      -      -      -      -      -      -      -      -      -      -      -      -      -      -
  nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937831T-part3    18.7G  1.31G      0      0      0      0      -      -      -      -      -      -      -      -      -      -
  nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937938H-part3    18.6G  1.37G      0      0      0      0      -      -      -      -      -      -      -      -      -      -
-------------------------------------------------------------  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
data_pool                                                       329G   599G      0      0      0      0      -      -      -      -      -      -      -      -      -      -
  mirror                                                        329G   599G      0      0      0      0      -      -      -      -      -      -      -      -      -      -
    ata-WDC_WD1005FBYZ-01YCBB2_WD-WMC6M0D0NFEE-part1               -      -      0      0      0      0      -      -      -      -      -      -      -      -      -      -
    ata-WDC_WD1005FBYZ-01YCBB2_WD-WMC6N0L2TXDR-part1               -      -      0      0      0      0      -      -      -      -      -      -      -      -      -      -
logs                                                               -      -      -      -      -      -      -      -      -      -      -      -      -      -      -      -
  mirror                                                        196K  19.5G      0      0      0      0      -      -      -      -      -      -      -      -      -      -
    nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937831T-part2      -      -      0      0      0      0      -      -      -      -      -      -      -      -      -      -
    nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937938H-part2      -      -      0      0      0      0      -      -      -      -      -      -      -      -      -      -
cache                                                              -      -      -      -      -      -      -      -      -      -      -      -      -      -      -      -
  nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937831T-part1    41.8G  58.2G      0      0      0      0      -      -      -      -      -      -      -      -      -      -
  nvme-Samsung_SSD_970_EVO_Plus_250GB_S4EUNX0R937938H-part1    42.9G  57.1G      0      0      0      0      -      -      -      -      -      -      -      -      -      -
-------------------------------------------------------------  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
</code>
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