CRSD进程在11g中的变化
在11.2中,CRSD进程不再是RAC中最关键的进程之一。
如果对10g RAC比较熟悉,应该清楚CRSD进程的重要性,Oracle在操作系统启动后,就是通过启动这个进程然后启动整个CLUSTER以及数据库的。
在11.2的RAC中,Oracle调整了ASM,使得OCR和VOT可以存储在ASM磁盘组中。ASM是CLUSTER所支持的一个组件,而CLUSTER启动所需的OCR和VOT却要放在ASM中,这其实要解决一个先有鸡还是先有蛋的问题。最终Oracle通过OHASD进程的方式解决了这个问题,而整个CLUSTER和ASM的架构也发生了重大的变化,OHASD进程取代了CRSD进程变成了RAC环境中最关键的进程。
而CRSD进程的重要性已经低到难以置信的地步,前两天在一个客户的11.2 RAC环境中发现,即使一个节点的CRSD进程没有启动,仍然可以手工启动数据库,且数据库可以正常访问。
导致的问题原因应该是节点2上访问OCR和VOT所在的磁盘组出现了错误,导致CRSD在多次尝试获取OCR中存储的信息失败后自动退出,从而使得节点2无法正常的启动。不过这时节点2上除了CRSD进程外,其他的CLUSTER进程已经完全启动,ASM实例也可以启动,这时可以手工启动节点2上的数据库。
节点2上ASM的alert有如下的错误信息:
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Tue Jun 13 10:59:17 2017
Reconfiguration started (old inc 10, new inc 12)
List of instances:
1 2 (myinst: 1)
Global Resource Directory frozen
Communication channels reestablished
Master broadcasted resource
hash
value bitmaps
Non-
local
Process blocks cleaned out
Tue Jun 13 10:59:17 2017
LMS 0: 0 GCS shadows cancelled, 0 closed, 0 Xw survived
Set master node info
Submitted all remote-enqueue requests
Dwn-cvts replayed, VALBLKs dubious
All grantable enqueues granted
Submitted all GCS remote-cache requests
Fix write
in
gcs resources
Reconfiguration complete
Tue Jun 13 11:03:01 2017
IPC Send timeout detected. Sender: ospid 3173 [oracle@rac1 (PING)]
Receiver: inst 2 binc 429480538 ospid 3190
Tue Jun 13 12:12:38 2017
NOTE: [ocrcheck.bin@rac1 (TNS V1-V3) 21461] opening OCR
file
Tue Jun 13 12:12:38 2017
NOTE: [ocrcheck.bin@rac1 (TNS V1-V3) 21461] opening OCR
file
Tue Jun 13 13:38:34 2017
MEMORY_TARGET defaulting to 1128267776.
* instance_number obtained from CSS = 1, checking
for
the existence of node 0...
* node 0 does not exist. instance_number = 1
Starting ORACLE instance (normal)
Tue Jun 13 13:42:20 2017
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 1.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 1.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 2.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 2.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 3.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 3.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 4.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 4.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 5.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 5.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 6.
WARNING: Waited 15 secs
for
write IO to PST disk 0
in
group 6.
应该就是这个原因导致ocrd进程报错并退出。数据库可以正常打开,节点2上数据库和监听无法自动启动,vip也存在问题。此外节点2上需要ocr信息的工具都无法使用,比如ocrconfig、ocrcheck以及srvctl等。
目前还是没有解决,如有遇到的朋友可以
本文转自xiaocao1314051CTO博客,原文链接: http://blog.51cto.com/xiaocao13140/1935102,如需转载请自行联系原作者