zfs log cache

danil75

New Member


Messages: 6

i build a pool with logs and when i copy data from client to server i see only
the cache being used and not the log.
when i copy from the server to the client the cache is used and not the log.

what the log and cache are used for? how to configure it.

i just added the to the pool
zpool add Data log ada5p1
zppol add Data cache adap2

do i need to tell the system to use it or it's automatic?


state: ONLINE
scan: scrub repaired 0 in 0 days 00:12:29 with 0 errors on Thu Oct 24 23:43:02 2019
config:

NAME STATE READ WRITE CKSUM
Data ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ada2 ONLINE 0 0 0
ada3 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
ada4 ONLINE 0 0 0
ada5 ONLINE 0 0 0
logs
ada1p1 ONLINE 0 0 0
cache
ada1p2 ONLINE 0 0 0
 

usdmatt

Daemon

Reaction score: 531
Messages: 1,423

Both are automatic. The cache stores frequently and recently used blocks of data. The log device is purely used to accelerate sync writes. You may not be making any sync writes.
 
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danil75

New Member


Messages: 6

thank's.
i created 100G partiton log and 100G partition cache on SSD drive.
when i copy files i see that the log write bandwith only 3M-4M and the same is the cache.
what does it mean? can i change that? for better performance?


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