Lines Matching full:disk
5 Raid 4/5/6 could include an extra disk for data cache besides normal RAID
6 disks. The role of RAID disks isn't changed with the cache disk. The cache disk
19 In both modes, all writes to the array will hit cache disk first. This means
20 the cache disk must be fast and sustainable.
34 The write-through cache will cache all data on cache disk first. After the data
35 is safe on the cache disk, the data will be flushed onto RAID disks. The
40 filesystems) after the data is safe on RAID disks, so cache disk failure
41 doesn't cause data loss. Of course cache disk failure means the array is
44 In write-through mode, the cache disk isn't required to be big. Several
51 cached on cache disk. But the main goal of 'write-back' cache is to speed up
62 filesystems) right after the data hits cache disk. The data is flushed to raid
63 disks later after specific conditions met. So cache disk failure will cause
67 the same data stored on cache disk, so a power loss doesn't cause data loss.
73 Too small cache disk will make the write aggregation less efficient in this
74 mode depending on the workloads. It's recommended to use a cache disk with at
80 The write-through and write-back cache use the same disk format. The cache disk
90 order in which MD writes data to cache disk and RAID disks. Specifically, in
102 stripe write, free cache disk space is low or free in-kernel memory cache space