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

admin

"osd_max_backfills": "1",
"osd_recovery_sleep": "0",
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"osd_recovery_max_active": "3",

"osd_recovery_max_single_start": "1",

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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/ D+ a3 A4 z' o- z" R7 l( y5 r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。

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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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" R8 m" U1 @7 W" J  @# t1 E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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业务优先：

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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'
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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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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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[root@ceph1 ~]# ceph tell 'osd.*' injectargs '--osd-recovery-max-active 4'
osd.0: osd_recovery_max_active = '4' (not observed, change may require restart)
osd.0: {}
6 a) g' ^* t  p& {osd.1: osd_recovery_max_active = '4' (not observed, change may require restart)
# f9 b6 n! M$ X0 R! Tosd.1: {}
osd.2: osd_recovery_max_active = '4' (not observed, change may require restart)
osd.2: {}
' c# w) N) Q6 P& P  {& R" k/ E[root@ceph1 ~]# ceph tell 'osd.*' injectargs '--osd-max-backfills 16'
3 n& l. }8 ^3 _+ m  R( Qosd.0: osd_max_backfills = '16'
1 j- `7 S+ b- g* @osd.0: {}
osd.1: osd_max_backfills = '16'
osd.1: {}
9 C( \! \8 H- E" Nosd.2: osd_max_backfills = '16'
osd.2: {}
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. w2 D6 q* ^& c. s2 @: n8 V, G上面都是临时方式修改：
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