Configuring ZFS Cache for High Speed IO¶

1. ZFS Intent Log, or ZIL, to buffer WRITE operations.
2. ARC and L2ARC which are meant for READ operations.

add:

zpool add tank log ada3
zpool add tank log mirror ada3 ada4
zpool add tank cache ada3


zpool add zfspool log mirror gpt/log0 gpt/log1
zpool add zfspool cache gpt/cache0 gpt/cache1

remove

root@pve1:~# zpool status
  pool: rpool
 state: ONLINE
  scan: scrub repaired 0B in 0 days 00:47:47 with 0 errors on Sun Mar  8 01:11:49 2020
config:

	NAME                                              STATE     READ WRITE CKSUM
	rpool                                             ONLINE       0     0     0
	  mirror-0                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001c-part3  ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001d-part3  ONLINE       0     0     0
	  mirror-1                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001e        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001f        ONLINE       0     0     0
	  mirror-2                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500020        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500021        ONLINE       0     0     0
	logs
	  mirror-3                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500022-part2  ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500023-part2  ONLINE       0     0     0
	cache
	  sdg1                                            ONLINE       0     0     0
	  sdh1                                            ONLINE       0     0     0

errors: No known data errors

root@pve1:~# zpool remove rpool sdg1
root@pve1:~# zpool remove rpool sdh1
root@pve1:~# zpool status

NAME                                              STATE     READ WRITE CKSUM
	rpool                                             ONLINE       0     0     0
	  mirror-0                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001c-part3  ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001d-part3  ONLINE       0     0     0
	  mirror-1                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001e        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001f        ONLINE       0     0     0
	  mirror-2                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500020        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500021        ONLINE       0     0     0
	logs
	  mirror-3                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500022-part2  ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500023-part2  ONLINE       0     0     0

root@pve1:~#zpool remove rpool mirror-3

root@pve1:~# zpool status
  pool: rpool
 state: ONLINE
  scan: scrub repaired 0B in 0 days 00:47:47 with 0 errors on Sun Mar  8 01:11:49 2020
config:

	NAME                                              STATE     READ WRITE CKSUM
	rpool                                             ONLINE       0     0     0
	  mirror-0                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001c-part3  ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001d-part3  ONLINE       0     0     0
	  mirror-1                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001e        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c50001f        ONLINE       0     0     0
	  mirror-2                                        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500020        ONLINE       0     0     0
	    scsi-3600508b100104439535549314c500021        ONLINE       0     0     0

errors: No known data errors