root / htools / Ganeti / HTools / Instance.hs @ 1496f5f3
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1 | e4f08c46 | Iustin Pop | {-| Module describing an instance. |
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2 | e4f08c46 | Iustin Pop | |
3 | e4f08c46 | Iustin Pop | The instance data type holds very few fields, the algorithm |
4 | e4f08c46 | Iustin Pop | intelligence is in the "Node" and "Cluster" modules. |
5 | e4f08c46 | Iustin Pop | |
6 | e4f08c46 | Iustin Pop | -} |
7 | e2fa2baf | Iustin Pop | |
8 | e2fa2baf | Iustin Pop | {- |
9 | e2fa2baf | Iustin Pop | |
10 | aa5b2f07 | Iustin Pop | Copyright (C) 2009, 2010, 2011, 2012 Google Inc. |
11 | e2fa2baf | Iustin Pop | |
12 | e2fa2baf | Iustin Pop | This program is free software; you can redistribute it and/or modify |
13 | e2fa2baf | Iustin Pop | it under the terms of the GNU General Public License as published by |
14 | e2fa2baf | Iustin Pop | the Free Software Foundation; either version 2 of the License, or |
15 | e2fa2baf | Iustin Pop | (at your option) any later version. |
16 | e2fa2baf | Iustin Pop | |
17 | e2fa2baf | Iustin Pop | This program is distributed in the hope that it will be useful, but |
18 | e2fa2baf | Iustin Pop | WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | e2fa2baf | Iustin Pop | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
20 | e2fa2baf | Iustin Pop | General Public License for more details. |
21 | e2fa2baf | Iustin Pop | |
22 | e2fa2baf | Iustin Pop | You should have received a copy of the GNU General Public License |
23 | e2fa2baf | Iustin Pop | along with this program; if not, write to the Free Software |
24 | e2fa2baf | Iustin Pop | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
25 | e2fa2baf | Iustin Pop | 02110-1301, USA. |
26 | e2fa2baf | Iustin Pop | |
27 | e2fa2baf | Iustin Pop | -} |
28 | e2fa2baf | Iustin Pop | |
29 | 181d4e04 | Iustin Pop | module Ganeti.HTools.Instance |
30 | ebf38064 | Iustin Pop | ( Instance(..) |
31 | ebf38064 | Iustin Pop | , AssocList |
32 | ebf38064 | Iustin Pop | , List |
33 | ebf38064 | Iustin Pop | , create |
34 | 7959cbb9 | Iustin Pop | , isRunning |
35 | 7959cbb9 | Iustin Pop | , isOffline |
36 | 7959cbb9 | Iustin Pop | , notOffline |
37 | ebf38064 | Iustin Pop | , instanceDown |
38 | 55bd1414 | Iustin Pop | , usesSecMem |
39 | ebf38064 | Iustin Pop | , applyIfOnline |
40 | ebf38064 | Iustin Pop | , setIdx |
41 | ebf38064 | Iustin Pop | , setName |
42 | ebf38064 | Iustin Pop | , setAlias |
43 | ebf38064 | Iustin Pop | , setPri |
44 | ebf38064 | Iustin Pop | , setSec |
45 | ebf38064 | Iustin Pop | , setBoth |
46 | ebf38064 | Iustin Pop | , setMovable |
47 | ebf38064 | Iustin Pop | , specOf |
48 | aa5b2f07 | Iustin Pop | , instBelowISpec |
49 | aa5b2f07 | Iustin Pop | , instAboveISpec |
50 | aa5b2f07 | Iustin Pop | , instMatchesPolicy |
51 | ebf38064 | Iustin Pop | , shrinkByType |
52 | ebf38064 | Iustin Pop | , localStorageTemplates |
53 | ebf38064 | Iustin Pop | , hasSecondary |
54 | ebf38064 | Iustin Pop | , requiredNodes |
55 | ebf38064 | Iustin Pop | , allNodes |
56 | ebf38064 | Iustin Pop | , usesLocalStorage |
57 | fafd0773 | Iustin Pop | , mirrorType |
58 | ebf38064 | Iustin Pop | ) where |
59 | e4f08c46 | Iustin Pop | |
60 | 01e52493 | Iustin Pop | import Ganeti.BasicTypes |
61 | 262a08a2 | Iustin Pop | import qualified Ganeti.HTools.Types as T |
62 | 262a08a2 | Iustin Pop | import qualified Ganeti.HTools.Container as Container |
63 | 262a08a2 | Iustin Pop | |
64 | 26d62e4c | Iustin Pop | import Ganeti.Utils |
65 | 61bbbed7 | Agata Murawska | |
66 | 9188aeef | Iustin Pop | -- * Type declarations |
67 | 9188aeef | Iustin Pop | |
68 | 525bfb36 | Iustin Pop | -- | The instance type. |
69 | c352b0a9 | Iustin Pop | data Instance = Instance |
70 | ebf38064 | Iustin Pop | { name :: String -- ^ The instance name |
71 | ebf38064 | Iustin Pop | , alias :: String -- ^ The shortened name |
72 | ebf38064 | Iustin Pop | , mem :: Int -- ^ Memory of the instance |
73 | ebf38064 | Iustin Pop | , dsk :: Int -- ^ Disk size of instance |
74 | ebf38064 | Iustin Pop | , vcpus :: Int -- ^ Number of VCPUs |
75 | ebf38064 | Iustin Pop | , runSt :: T.InstanceStatus -- ^ Original run status |
76 | ebf38064 | Iustin Pop | , pNode :: T.Ndx -- ^ Original primary node |
77 | ebf38064 | Iustin Pop | , sNode :: T.Ndx -- ^ Original secondary node |
78 | ebf38064 | Iustin Pop | , idx :: T.Idx -- ^ Internal index |
79 | ebf38064 | Iustin Pop | , util :: T.DynUtil -- ^ Dynamic resource usage |
80 | ebf38064 | Iustin Pop | , movable :: Bool -- ^ Can and should the instance be moved? |
81 | ebf38064 | Iustin Pop | , autoBalance :: Bool -- ^ Is the instance auto-balanced? |
82 | ebf38064 | Iustin Pop | , diskTemplate :: T.DiskTemplate -- ^ The disk template of the instance |
83 | ec629280 | René Nussbaumer | , spindleUse :: Int -- ^ The numbers of used spindles |
84 | 2f907bad | Dato Simó | , allTags :: [String] -- ^ List of all instance tags |
85 | 2f907bad | Dato Simó | , exclTags :: [String] -- ^ List of instance exclusion tags |
86 | 139c0683 | Iustin Pop | } deriving (Show, Eq) |
87 | e4f08c46 | Iustin Pop | |
88 | 262a08a2 | Iustin Pop | instance T.Element Instance where |
89 | ebf38064 | Iustin Pop | nameOf = name |
90 | ebf38064 | Iustin Pop | idxOf = idx |
91 | ebf38064 | Iustin Pop | setAlias = setAlias |
92 | ebf38064 | Iustin Pop | setIdx = setIdx |
93 | ebf38064 | Iustin Pop | allNames n = [name n, alias n] |
94 | 262a08a2 | Iustin Pop | |
95 | 8a8ed513 | Agata Murawska | -- | Check if instance is running. |
96 | 7959cbb9 | Iustin Pop | isRunning :: Instance -> Bool |
97 | 7959cbb9 | Iustin Pop | isRunning (Instance {runSt = T.Running}) = True |
98 | 7959cbb9 | Iustin Pop | isRunning (Instance {runSt = T.ErrorUp}) = True |
99 | 7959cbb9 | Iustin Pop | isRunning _ = False |
100 | a46f34d7 | Iustin Pop | |
101 | 61bbbed7 | Agata Murawska | -- | Check if instance is offline. |
102 | 7959cbb9 | Iustin Pop | isOffline :: Instance -> Bool |
103 | 5e9deac0 | Iustin Pop | isOffline (Instance {runSt = T.StatusOffline}) = True |
104 | 5e9deac0 | Iustin Pop | isOffline _ = False |
105 | 61bbbed7 | Agata Murawska | |
106 | 9cd6c325 | Iustin Pop | |
107 | 9cd6c325 | Iustin Pop | -- | Helper to check if the instance is not offline. |
108 | 7959cbb9 | Iustin Pop | notOffline :: Instance -> Bool |
109 | 7959cbb9 | Iustin Pop | notOffline = not . isOffline |
110 | 9cd6c325 | Iustin Pop | |
111 | 61bbbed7 | Agata Murawska | -- | Check if instance is down. |
112 | 61bbbed7 | Agata Murawska | instanceDown :: Instance -> Bool |
113 | 7959cbb9 | Iustin Pop | instanceDown inst | isRunning inst = False |
114 | 7959cbb9 | Iustin Pop | instanceDown inst | isOffline inst = False |
115 | 7959cbb9 | Iustin Pop | instanceDown _ = True |
116 | 61bbbed7 | Agata Murawska | |
117 | 61bbbed7 | Agata Murawska | -- | Apply the function if the instance is online. Otherwise use |
118 | 61bbbed7 | Agata Murawska | -- the initial value |
119 | 61bbbed7 | Agata Murawska | applyIfOnline :: Instance -> (a -> a) -> a -> a |
120 | 7959cbb9 | Iustin Pop | applyIfOnline = applyIf . notOffline |
121 | 61bbbed7 | Agata Murawska | |
122 | 55bd1414 | Iustin Pop | -- | Helper for determining whether an instance's memory needs to be |
123 | 55bd1414 | Iustin Pop | -- taken into account for secondary memory reservation. |
124 | 55bd1414 | Iustin Pop | usesSecMem :: Instance -> Bool |
125 | 7959cbb9 | Iustin Pop | usesSecMem inst = notOffline inst && autoBalance inst |
126 | 55bd1414 | Iustin Pop | |
127 | 8353b5e1 | Iustin Pop | -- | Constant holding the local storage templates. |
128 | 8353b5e1 | Iustin Pop | -- |
129 | 8353b5e1 | Iustin Pop | -- /Note:/ Currently Ganeti only exports node total/free disk space |
130 | 8353b5e1 | Iustin Pop | -- for LVM-based storage; file-based storage is ignored in this model, |
131 | 8353b5e1 | Iustin Pop | -- so even though file-based storage uses in reality disk space on the |
132 | 8353b5e1 | Iustin Pop | -- node, in our model it won't affect it and we can't compute whether |
133 | 8353b5e1 | Iustin Pop | -- there is enough disk space for a file-based instance. Therefore we |
134 | 8353b5e1 | Iustin Pop | -- will treat this template as \'foreign\' storage. |
135 | 8353b5e1 | Iustin Pop | localStorageTemplates :: [T.DiskTemplate] |
136 | 8353b5e1 | Iustin Pop | localStorageTemplates = [ T.DTDrbd8, T.DTPlain ] |
137 | 8353b5e1 | Iustin Pop | |
138 | 8353b5e1 | Iustin Pop | -- | Constant holding the movable disk templates. |
139 | 8353b5e1 | Iustin Pop | -- |
140 | 8353b5e1 | Iustin Pop | -- This only determines the initial 'movable' state of the |
141 | 8353b5e1 | Iustin Pop | -- instance. Further the movable state can be restricted more due to |
142 | 8353b5e1 | Iustin Pop | -- user choices, etc. |
143 | 8353b5e1 | Iustin Pop | movableDiskTemplates :: [T.DiskTemplate] |
144 | 2c7b328c | Iustin Pop | movableDiskTemplates = |
145 | 2c7b328c | Iustin Pop | [ T.DTDrbd8 |
146 | 2c7b328c | Iustin Pop | , T.DTBlock |
147 | 2c7b328c | Iustin Pop | , T.DTSharedFile |
148 | 2c7b328c | Iustin Pop | , T.DTRbd |
149 | 2c7b328c | Iustin Pop | ] |
150 | 8353b5e1 | Iustin Pop | |
151 | 9188aeef | Iustin Pop | -- | A simple name for the int, instance association list. |
152 | 608efcce | Iustin Pop | type AssocList = [(T.Idx, Instance)] |
153 | 040afc35 | Iustin Pop | |
154 | 9188aeef | Iustin Pop | -- | A simple name for an instance map. |
155 | 262a08a2 | Iustin Pop | type List = Container.Container Instance |
156 | 262a08a2 | Iustin Pop | |
157 | 9188aeef | Iustin Pop | -- * Initialization |
158 | 9188aeef | Iustin Pop | |
159 | 9188aeef | Iustin Pop | -- | Create an instance. |
160 | 9188aeef | Iustin Pop | -- |
161 | 9188aeef | Iustin Pop | -- Some parameters are not initialized by function, and must be set |
162 | 9188aeef | Iustin Pop | -- later (via 'setIdx' for example). |
163 | 7dd14211 | Agata Murawska | create :: String -> Int -> Int -> Int -> T.InstanceStatus |
164 | 981bb5cf | René Nussbaumer | -> [String] -> Bool -> T.Ndx -> T.Ndx -> T.DiskTemplate -> Int |
165 | 981bb5cf | René Nussbaumer | -> Instance |
166 | c352b0a9 | Iustin Pop | create name_init mem_init dsk_init vcpus_init run_init tags_init |
167 | 981bb5cf | René Nussbaumer | auto_balance_init pn sn dt su = |
168 | ebf38064 | Iustin Pop | Instance { name = name_init |
169 | ebf38064 | Iustin Pop | , alias = name_init |
170 | ebf38064 | Iustin Pop | , mem = mem_init |
171 | ebf38064 | Iustin Pop | , dsk = dsk_init |
172 | ebf38064 | Iustin Pop | , vcpus = vcpus_init |
173 | ebf38064 | Iustin Pop | , runSt = run_init |
174 | ebf38064 | Iustin Pop | , pNode = pn |
175 | ebf38064 | Iustin Pop | , sNode = sn |
176 | ebf38064 | Iustin Pop | , idx = -1 |
177 | ebf38064 | Iustin Pop | , util = T.baseUtil |
178 | ebf38064 | Iustin Pop | , movable = supportsMoves dt |
179 | ebf38064 | Iustin Pop | , autoBalance = auto_balance_init |
180 | ebf38064 | Iustin Pop | , diskTemplate = dt |
181 | ec629280 | René Nussbaumer | , spindleUse = su |
182 | 2f907bad | Dato Simó | , allTags = tags_init |
183 | 2f907bad | Dato Simó | , exclTags = [] |
184 | ebf38064 | Iustin Pop | } |
185 | e4f08c46 | Iustin Pop | |
186 | 9188aeef | Iustin Pop | -- | Changes the index. |
187 | 9188aeef | Iustin Pop | -- |
188 | 9188aeef | Iustin Pop | -- This is used only during the building of the data structures. |
189 | 903a7d46 | Iustin Pop | setIdx :: Instance -- ^ The original instance |
190 | 903a7d46 | Iustin Pop | -> T.Idx -- ^ New index |
191 | 903a7d46 | Iustin Pop | -> Instance -- ^ The modified instance |
192 | 9188aeef | Iustin Pop | setIdx t i = t { idx = i } |
193 | 9188aeef | Iustin Pop | |
194 | 9188aeef | Iustin Pop | -- | Changes the name. |
195 | 9188aeef | Iustin Pop | -- |
196 | 9188aeef | Iustin Pop | -- This is used only during the building of the data structures. |
197 | 9188aeef | Iustin Pop | setName :: Instance -- ^ The original instance |
198 | 9188aeef | Iustin Pop | -> String -- ^ New name |
199 | 903a7d46 | Iustin Pop | -> Instance -- ^ The modified instance |
200 | 8bcdde0c | Iustin Pop | setName t s = t { name = s, alias = s } |
201 | 8bcdde0c | Iustin Pop | |
202 | 8bcdde0c | Iustin Pop | -- | Changes the alias. |
203 | 8bcdde0c | Iustin Pop | -- |
204 | 8bcdde0c | Iustin Pop | -- This is used only during the building of the data structures. |
205 | 8bcdde0c | Iustin Pop | setAlias :: Instance -- ^ The original instance |
206 | 8bcdde0c | Iustin Pop | -> String -- ^ New alias |
207 | 8bcdde0c | Iustin Pop | -> Instance -- ^ The modified instance |
208 | 8bcdde0c | Iustin Pop | setAlias t s = t { alias = s } |
209 | 9188aeef | Iustin Pop | |
210 | 9188aeef | Iustin Pop | -- * Update functions |
211 | 9188aeef | Iustin Pop | |
212 | e4f08c46 | Iustin Pop | -- | Changes the primary node of the instance. |
213 | fd934a28 | Iustin Pop | setPri :: Instance -- ^ the original instance |
214 | 608efcce | Iustin Pop | -> T.Ndx -- ^ the new primary node |
215 | e4f08c46 | Iustin Pop | -> Instance -- ^ the modified instance |
216 | 2060348b | Iustin Pop | setPri t p = t { pNode = p } |
217 | e4f08c46 | Iustin Pop | |
218 | e4f08c46 | Iustin Pop | -- | Changes the secondary node of the instance. |
219 | fd934a28 | Iustin Pop | setSec :: Instance -- ^ the original instance |
220 | 608efcce | Iustin Pop | -> T.Ndx -- ^ the new secondary node |
221 | e4f08c46 | Iustin Pop | -> Instance -- ^ the modified instance |
222 | 2060348b | Iustin Pop | setSec t s = t { sNode = s } |
223 | e4f08c46 | Iustin Pop | |
224 | e4f08c46 | Iustin Pop | -- | Changes both nodes of the instance. |
225 | fd934a28 | Iustin Pop | setBoth :: Instance -- ^ the original instance |
226 | 608efcce | Iustin Pop | -> T.Ndx -- ^ new primary node index |
227 | 608efcce | Iustin Pop | -> T.Ndx -- ^ new secondary node index |
228 | e4f08c46 | Iustin Pop | -> Instance -- ^ the modified instance |
229 | 2060348b | Iustin Pop | setBoth t p s = t { pNode = p, sNode = s } |
230 | c8db97e5 | Iustin Pop | |
231 | 179c0828 | Iustin Pop | -- | Sets the movable flag on an instance. |
232 | a182df55 | Iustin Pop | setMovable :: Instance -- ^ The original instance |
233 | a182df55 | Iustin Pop | -> Bool -- ^ New movable flag |
234 | a182df55 | Iustin Pop | -> Instance -- ^ The modified instance |
235 | a182df55 | Iustin Pop | setMovable t m = t { movable = m } |
236 | a182df55 | Iustin Pop | |
237 | c8db97e5 | Iustin Pop | -- | Try to shrink the instance based on the reason why we can't |
238 | c8db97e5 | Iustin Pop | -- allocate it. |
239 | 01e52493 | Iustin Pop | shrinkByType :: Instance -> T.FailMode -> Result Instance |
240 | 1e3dccc8 | Iustin Pop | shrinkByType inst T.FailMem = let v = mem inst - T.unitMem |
241 | 1e3dccc8 | Iustin Pop | in if v < T.unitMem |
242 | 01e52493 | Iustin Pop | then Bad "out of memory" |
243 | 01e52493 | Iustin Pop | else Ok inst { mem = v } |
244 | 1e3dccc8 | Iustin Pop | shrinkByType inst T.FailDisk = let v = dsk inst - T.unitDsk |
245 | 1e3dccc8 | Iustin Pop | in if v < T.unitDsk |
246 | 01e52493 | Iustin Pop | then Bad "out of disk" |
247 | 01e52493 | Iustin Pop | else Ok inst { dsk = v } |
248 | 1e3dccc8 | Iustin Pop | shrinkByType inst T.FailCPU = let v = vcpus inst - T.unitCpu |
249 | 1e3dccc8 | Iustin Pop | in if v < T.unitCpu |
250 | 01e52493 | Iustin Pop | then Bad "out of vcpus" |
251 | 01e52493 | Iustin Pop | else Ok inst { vcpus = v } |
252 | 01e52493 | Iustin Pop | shrinkByType _ f = Bad $ "Unhandled failure mode " ++ show f |
253 | 83ad1f3c | Iustin Pop | |
254 | 83ad1f3c | Iustin Pop | -- | Return the spec of an instance. |
255 | 83ad1f3c | Iustin Pop | specOf :: Instance -> T.RSpec |
256 | 83ad1f3c | Iustin Pop | specOf Instance { mem = m, dsk = d, vcpus = c } = |
257 | ebf38064 | Iustin Pop | T.RSpec { T.rspecCpu = c, T.rspecMem = m, T.rspecDsk = d } |
258 | a10a476a | Iustin Pop | |
259 | aa5b2f07 | Iustin Pop | -- | Checks if an instance is smaller than a given spec. Returns |
260 | a8038349 | Iustin Pop | -- OpGood for a correct spec, otherwise Bad one of the possible |
261 | aa5b2f07 | Iustin Pop | -- failure modes. |
262 | aa5b2f07 | Iustin Pop | instBelowISpec :: Instance -> T.ISpec -> T.OpResult () |
263 | aa5b2f07 | Iustin Pop | instBelowISpec inst ispec |
264 | a8038349 | Iustin Pop | | mem inst > T.iSpecMemorySize ispec = Bad T.FailMem |
265 | a8038349 | Iustin Pop | | dsk inst > T.iSpecDiskSize ispec = Bad T.FailDisk |
266 | a8038349 | Iustin Pop | | vcpus inst > T.iSpecCpuCount ispec = Bad T.FailCPU |
267 | a8038349 | Iustin Pop | | otherwise = Ok () |
268 | aa5b2f07 | Iustin Pop | |
269 | aa5b2f07 | Iustin Pop | -- | Checks if an instance is bigger than a given spec. |
270 | aa5b2f07 | Iustin Pop | instAboveISpec :: Instance -> T.ISpec -> T.OpResult () |
271 | aa5b2f07 | Iustin Pop | instAboveISpec inst ispec |
272 | a8038349 | Iustin Pop | | mem inst < T.iSpecMemorySize ispec = Bad T.FailMem |
273 | a8038349 | Iustin Pop | | dsk inst < T.iSpecDiskSize ispec = Bad T.FailDisk |
274 | a8038349 | Iustin Pop | | vcpus inst < T.iSpecCpuCount ispec = Bad T.FailCPU |
275 | a8038349 | Iustin Pop | | otherwise = Ok () |
276 | aa5b2f07 | Iustin Pop | |
277 | aa5b2f07 | Iustin Pop | -- | Checks if an instance matches a policy. |
278 | aa5b2f07 | Iustin Pop | instMatchesPolicy :: Instance -> T.IPolicy -> T.OpResult () |
279 | aa5b2f07 | Iustin Pop | instMatchesPolicy inst ipol = do |
280 | aa5b2f07 | Iustin Pop | instAboveISpec inst (T.iPolicyMinSpec ipol) |
281 | aa5b2f07 | Iustin Pop | instBelowISpec inst (T.iPolicyMaxSpec ipol) |
282 | 5b11f8db | Iustin Pop | if diskTemplate inst `elem` T.iPolicyDiskTemplates ipol |
283 | a8038349 | Iustin Pop | then Ok () |
284 | a8038349 | Iustin Pop | else Bad T.FailDisk |
285 | aa5b2f07 | Iustin Pop | |
286 | 8353b5e1 | Iustin Pop | -- | Checks whether the instance uses a secondary node. |
287 | 8353b5e1 | Iustin Pop | -- |
288 | 8353b5e1 | Iustin Pop | -- /Note:/ This should be reconciled with @'sNode' == |
289 | 8353b5e1 | Iustin Pop | -- 'Node.noSecondary'@. |
290 | 8353b5e1 | Iustin Pop | hasSecondary :: Instance -> Bool |
291 | 8353b5e1 | Iustin Pop | hasSecondary = (== T.DTDrbd8) . diskTemplate |
292 | 8353b5e1 | Iustin Pop | |
293 | 179c0828 | Iustin Pop | -- | Computed the number of nodes for a given disk template. |
294 | a10a476a | Iustin Pop | requiredNodes :: T.DiskTemplate -> Int |
295 | a10a476a | Iustin Pop | requiredNodes T.DTDrbd8 = 2 |
296 | a10a476a | Iustin Pop | requiredNodes _ = 1 |
297 | d254d6ce | Iustin Pop | |
298 | d254d6ce | Iustin Pop | -- | Computes all nodes of an instance. |
299 | d254d6ce | Iustin Pop | allNodes :: Instance -> [T.Ndx] |
300 | d254d6ce | Iustin Pop | allNodes inst = case diskTemplate inst of |
301 | d254d6ce | Iustin Pop | T.DTDrbd8 -> [pNode inst, sNode inst] |
302 | d254d6ce | Iustin Pop | _ -> [pNode inst] |
303 | 8353b5e1 | Iustin Pop | |
304 | 8353b5e1 | Iustin Pop | -- | Checks whether a given disk template uses local storage. |
305 | 8353b5e1 | Iustin Pop | usesLocalStorage :: Instance -> Bool |
306 | 8353b5e1 | Iustin Pop | usesLocalStorage = (`elem` localStorageTemplates) . diskTemplate |
307 | 8353b5e1 | Iustin Pop | |
308 | 8353b5e1 | Iustin Pop | -- | Checks whether a given disk template supported moves. |
309 | 8353b5e1 | Iustin Pop | supportsMoves :: T.DiskTemplate -> Bool |
310 | 8353b5e1 | Iustin Pop | supportsMoves = (`elem` movableDiskTemplates) |
311 | fafd0773 | Iustin Pop | |
312 | fafd0773 | Iustin Pop | -- | A simple wrapper over 'T.templateMirrorType'. |
313 | fafd0773 | Iustin Pop | mirrorType :: Instance -> T.MirrorType |
314 | fafd0773 | Iustin Pop | mirrorType = T.templateMirrorType . diskTemplate |