ZFS Nyomozás

Pool állapotának lekérdezése

zpool status -stvD

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

Cachek állapotának lekérdezése

Minden olvasási cache infó:

arc_summary

Olvasási L1 cache (RAM):

arc_summary -s arc

------------------------------------------------------------------------
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

Olvasási L2 cache (disk)

arc_summary -s l2arc

------------------------------------------------------------------------
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

Olvasás cache-elésének sikeressége:

arc_summary -s archits

------------------------------------------------------------------------
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

OI Stat

Pillanatnyi IO állapot:

zpool iostat -vly 1

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 - - - - - - - - - -
------------------------------------------------------------- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----