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8 since 4.4) or write-back mode (supported since 4.10). mdadm (supported since
11 in write-through mode. A user can switch it to write-back mode by::
13 echo "write-back" > /sys/block/md0/md/journal_mode
15 And switch it back to write-through mode by::
30 tries to resync the array to bring it back to normal state. But before the
47 write-back mode
50 write-back mode fixes the 'write hole' issue too, since all write data is
51 cached on cache disk. But the main goal of 'write-back' cache is to speed up
56 overhead too. Write-back cache will aggregate the data and flush the data to
61 In write-back mode, MD reports IO completion to upper layer (usually
66 In write-back mode, MD also caches data in memory. The memory cache includes
75 least several gigabytes size in write-back mode.
80 The write-through and write-back cache use the same disk format. The cache disk
96 In write-back mode, MD writes IO data to the log and reports IO completion. The