ceph 参数默认值修改osd_recovery_max_active，速率配置

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"osd_max_backfills": "1",
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"osd_recovery_max_active": "3",

! j. V7 K% h- p  W"osd_recovery_max_single_start": "1",

( `6 f3 L( A& @" _3 C5 I: B无论哪种情况，osd上线后通常会发现，自己承载的pg有数据落后了，需要进入恢复模式，从其它osd上获取新的数据达到同步。
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这个过程就是recovery。recovery分为两种：log-based recovery: 是说osd故障时间不长，需要恢复的数据可以通过pg log回放找回来。


backfill recovery: 是说无法通过pg log回放找全数据，只能通过全量回填(backfill)拷贝。
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6 Z; K& R7 ]7 W7 F8 C操作前记得查看下默认参数值，操作完后记得恢复到原先参数


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- p# w0 m2 h2 G6 z6 u4 {ceph tell osd.* injectargs '--osd-max-backfills 1 --osd-recovery-max-active 1 --osd-recovery-max-single-start 1'ceph tell osd.* injectargs '--osd-recovery-sleep 1'


恢复优先：

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ceph tell osd.* injectargs '--osd-max-backfills 5 --osd-recovery-max-active 5 --osd-recovery-max-single-start 5'ceph tell osd.* injectargs '--osd-recovery-sleep 0'
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3 f+ G) l9 `4 d' _2 N7 e! k# y! f还原配置：
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ceph tell osd.* injectargs '--osd-max-backfills 1 --osd-recovery-max-active 3 --osd-recovery-max-single-start 1'ceph tell osd.* injectargs '--osd-recovery-sleep 0'
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* T- B8 ~3 H4 ?$ `, ^; V[root@ceph1 ~]# ceph tell 'osd.*' injectargs '--osd-recovery-max-active 4'
osd.0: osd_recovery_max_active = '4' (not observed, change may require restart)
+ s4 z# v$ p- x5 s1 e) {osd.0: {}
7 z3 ?* {* n" N  [" J7 R0 E, ?osd.1: osd_recovery_max_active = '4' (not observed, change may require restart)
2 {5 i% W+ z% [" @' J* _& q' qosd.1: {}
+ R4 w1 n- R" z9 c( h% posd.2: osd_recovery_max_active = '4' (not observed, change may require restart)
osd.2: {}
[root@ceph1 ~]# ceph tell 'osd.*' injectargs '--osd-max-backfills 16'
+ K& J; Z" k+ `osd.0: osd_max_backfills = '16'
osd.0: {}
; G' {' j2 F5 [/ ~2 v% x8 kosd.1: osd_max_backfills = '16'
+ ]0 [8 r. r$ N3 T" cosd.1: {}
1 A+ `3 X2 Z* @1 J$ Z4 n/ posd.2: osd_max_backfills = '16'
5 `  d4 m  r9 Rosd.2: {}
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7 x) c$ x! n6 L' n+ K7 U" L上面都是临时方式修改：
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