Lines Matching full:devices

39 .Ss Virtual Devices (vdevs)
40 A "virtual device" describes a single device or a collection of devices,
42 The following virtual devices are supported:
66 A mirror of two or more devices.
70 devices failing, without losing data.
96 .Em (N-P)*X No bytes and can withstand Em P No devices failing without losing data .
97 The minimum number of devices in a raidz group is one more than the number of
104 .Em D No data devices and Em P No parity devices .
144 devices failing without losing data.
154 The number of data devices per redundancy group.
162 Useful as a cross-check when listing a large number of devices.
176 devices.
177 Log devices can be mirrored.
185 devices in the pool.
187 allocations are load-balanced between those devices.
192 devices in the pool.
194 allocations are load-balanced between those devices.
203 .Sx Cache Devices
207 Virtual devices cannot be nested arbitrarily.
211 A pool can have any number of virtual devices at the top of the configuration
215 Data is dynamically distributed across all top-level devices to balance data
216 among devices.
217 As new virtual devices are added, ZFS automatically places data on the newly
218 available devices.
220 Virtual devices are specified one at a time on the command line,
243 An online pool has all devices operating normally.
244 A degraded pool is one in which one or more devices have failed, but the data is
246 A faulted pool has corrupted metadata, or one or more faulted devices, and
251 or component devices.
256 component devices are offline.
259 One or more component devices is in the degraded or faulted state, but
274 component devices are offline.
277 One or more component devices is in the faulted state, and insufficient
327 ZFS allows devices to be associated with pools as
329 These devices are not actively used in the pool.
334 vdev with any number of devices.
373 Spares cannot replace log devices.
379 devices when returning from a system call.
385 log devices such as NVRAM or a dedicated disk.
389 Multiple log devices can also be specified, and they can be mirrored.
392 section for an example of mirroring multiple log devices.
394 Log devices can be added, replaced, attached, detached, and removed.
395 In addition, log devices are imported and exported as part of the pool
397 Mirrored devices can be removed by specifying the top-level mirror vdev.
399 .Ss Cache Devices
400 Devices can be added to a storage pool as
401 .Qq cache devices .
402 These devices provide an additional layer of caching between main memory and
405 can be cached in main memory, using cache devices allows much more of this
407 Using cache devices provides the greatest performance improvement for random
410 To create a pool with cache devices, specify a
412 vdev with any number of devices.
416 Cache devices cannot be mirrored or part of a raidz configuration.
421 The content of the cache devices is persistent across reboots and restored
425 For cache devices smaller than
497 other devices can be assigned to the special class.