Lines Matching full:devices
38 .Ss Virtual Devices (vdevs)
39 A "virtual device" describes a single device or a collection of devices,
41 The following virtual devices are supported:
65 A mirror of two or more devices.
69 devices failing, without losing data.
95 .Em (N-P)*X No bytes and can withstand Em P No devices failing without losing data .
96 The minimum number of devices in a raidz group is one more than the number of
103 .Em D No data devices and Em P No parity devices .
143 devices failing without losing data.
153 The number of data devices per redundancy group.
161 Useful as a cross-check when listing a large number of devices.
175 devices.
176 Log devices can be mirrored.
184 devices in the pool.
186 allocations are load-balanced between those devices.
191 devices in the pool.
193 allocations are load-balanced between those devices.
202 .Sx Cache Devices
206 Virtual devices cannot be nested arbitrarily.
210 A pool can have any number of virtual devices at the top of the configuration
214 Data is dynamically distributed across all top-level devices to balance data
215 among devices.
216 As new virtual devices are added, ZFS automatically places data on the newly
217 available devices.
219 Virtual devices are specified one at a time on the command line,
242 An online pool has all devices operating normally.
243 A degraded pool is one in which one or more devices have failed, but the data is
245 A faulted pool has corrupted metadata, or one or more faulted devices, and
250 or component devices.
255 component devices are offline.
258 One or more component devices is in the degraded or faulted state, but
273 component devices are offline.
276 One or more component devices is in the faulted state, and insufficient
326 ZFS allows devices to be associated with pools as
328 These devices are not actively used in the pool.
333 vdev with any number of devices.
372 Spares cannot replace log devices.
378 devices when returning from a system call.
384 log devices such as NVRAM or a dedicated disk.
388 Multiple log devices can also be specified, and they can be mirrored.
391 section for an example of mirroring multiple log devices.
393 Log devices can be added, replaced, attached, detached, and removed.
394 In addition, log devices are imported and exported as part of the pool
396 Mirrored devices can be removed by specifying the top-level mirror vdev.
398 .Ss Cache Devices
399 Devices can be added to a storage pool as
400 .Qq cache devices .
401 These devices provide an additional layer of caching between main memory and
404 can be cached in main memory, using cache devices allows much more of this
406 Using cache devices provides the greatest performance improvement for random
409 To create a pool with cache devices, specify a
411 vdev with any number of devices.
415 Cache devices cannot be mirrored or part of a raidz configuration.
420 The content of the cache devices is persistent across reboots and restored
424 For cache devices smaller than
495 other devices can be assigned to the special class.