Lines Matching +full:fast +full:- +full:read
8 dm-cache is a device mapper target written by Joe Thornber, Heinz
15 This device-mapper solution allows us to insert this caching at
17 a thin-provisioning pool. Caching solutions that are integrated more
20 The target reuses the metadata library used in the thin-provisioning
23 The decision as to what data to migrate and when is left to a plug-in
35 Migration from slow device to fast device.
37 Migration from fast device to slow device.
46 Sub-devices
47 -----------
52 1. An origin device - the big, slow one.
54 2. A cache device - the small, fast one.
56 3. A small metadata device - records which blocks are in the cache,
64 ----------------
68 using block sizes of 256KB - 1024KB. The block size must be between 64
79 ---------------------
108 shrinking a cache. Shrinking the cache's fast device requires all cache
112 cache's fast device until the cache is clean. This is of particular
119 --------------------
131 Updating on-disk metadata
132 -------------------------
134 On-disk metadata is committed every time a FLUSH or FUA bio is written.
145 Per-block policy hints
146 ----------------------
148 Policy plug-ins can store a chunk of data per cache block. It's up to
156 ----------------
159 need a generic way of getting and setting these. Device-mapper
160 messages are used. Refer to cache-policies.txt.
163 -------------------------
177 -----------
186 metadata dev fast device holding the persistent metadata
187 cache dev fast device holding cached data blocks
199 See cache-policies.txt for details.
234 ------
240 <#read hits> <#read misses> <#write hits> <#write misses>
255 #read hits Number of times a READ bio has been mapped
257 #read misses Number of times a READ bio has been mapped
277 cache metadata mode ro if read-only, rw if read-write
279 In serious cases where even a read-only mode is
283 needs_check 'needs_check' if set, '-' if not set
289 '-' indicates needs_check is not set.
293 --------
296 need a generic way of getting and setting these. Device-mapper
311 range's end value is "one past the end", meaning 5-10 expresses a range
318 invalidate_cblocks [<cblock>|<cblock begin>-<cblock end>]*
322 dmsetup message my_cache 0 invalidate_cblocks 2345 3456-4567 5678-6789
329 https://github.com/jthornber/device-mapper-test-suite
333 dmsetup create my_cache --table '0 41943040 cache /dev/mapper/metadata \
335 dmsetup create my_cache --table '0 41943040 cache /dev/mapper/metadata \