ER problem---CDRACK cause rootserver crash

Hello,

I have any problems with ER rootserver; the server often
crashes..about 1-2 times per day.the system is Unixware 7 and IDS 9.20.
The error is :

16:20:23 Informix Dynamic Server 2000 Version 9.20.UC3
16:20:23 Who: Session(92, informix@sco00, 0, 390625404)
Thread(80, CDRACK_1, 17462bd8, 3)
File: mtex.c Line: 408
16:20:23 Results: Exception Caught. Type: MT_EX_OS, Context: mem
16:20:23 Action: Please notify Informix Technical Support.
16:20:23 stack trace for pid 17198 written to
/home2/informix/tmp/af.4380c56
16:20:23 See Also: /home2/informix/tmp/af.4380c56
.......
16:20:42 mtex.c, line 408, thread 80, proc id 17198, No Exception
Handler.
16:20:42 Fatal error in ADM VP at mt.c:11029
16:20:42 Unexpected virtual processor termination, pid = 17198, exit =
0x100

16:20:43 PANIC: Attempting to bring system down
16:20:43 semctl: errno = 22


Constantly the rootserver crashes by reason of CDRACK_0 or CDRACK_1.
The problem appears after I define new replicates between 2 leaf
servers connected directly to rootserver.

The architecture is here: sco00-rootserver
sco01,sco40,sco42,sco43,sco44,sco45,sco46
leaf servers connected directly to sco00.

I define new replicates primary target- data are replicated from
sco40-sco46 to sco01; this replicates replicate a lot of data...30-50
row(transaction)/ min. i think that this volume of data cause the crash
because before i define this new replicates I haven't this problem.

Here is part of onconfig and af. file genereted:
--onconfig
CDR_LOGBUFFERS 16384
CDR_EVALTHREADS 1,2 # evaluator threads
(per-cpu-vp,additional)
CDR_DSLOCKWAIT 300 # DS lockwait timeout (seconds)
#CDR_QUEUEMEM 4096 # Maximum amount of memory for any CDR
queue (Kbytes)
CDR_QUEUEMEM 16384
CDR_LOGDELTA 30 # % of log space allowed in queue
memory
CDR_NUMCONNECT 100 # Expected connections per server
CDR_NIFRETRY 300 # Connection retry (seconds)
CDR_NIFCOMPRESS 5 # Link level compression (-1 never, 0
none, 9 max)
--onstat -g ath

75 1816b1f0 174614d8 2 sleeping secs: 52 3cpu
CDRNsT117
77 1807fcf8 17461a98 2 cond wait CDRBlbslp 3cpu
CDRBLOB_0
78 182a2178 17462058 2 cond wait CDRBlbslp 3cpu
CDRBLOB_1
79 182af1a0 17462618 2 cond wait CDRAckslp 1cpu
CDRACK_0
*80 182bc1a0 17462bd8 2 running 3cpu
CDRACK_1
81 182c91f0 17463198 2 cond wait CDRDssleep 1cpu
CDRD_0
82 182d7178 17463758 2 cond wait CDRDssleep 1cpu
CDRD_1
83 182e4178 17463d18 2 cond wait netnorm 1cpu
CDRNr46

onstat -g stk 80 light:

Informix Dynamic Server 2000 Version 9.20.UC3 -- On-Line -- Up 1 days
05:11:08 -- 433028 Kbytes

Stack for thread: 80 CDRACK_1
base: 0x182c0018
len: 36864
pc: 0x0856f0eb
tos: 0x182c7dd8
state: running
vp: 3

0x08863d98 (*nosymtab*)0x8863d98



What can i do to avoid this problem ? Can I tuning any parameters on
onconfig file?

Also I think to define server sco01 as nonroot server and sco40..sco46
leaf servers connected to sco01..is it a good idea ? My expectation is
this architecture avoid replication from sco40-46 to sco01 through
sco00 so the data will be replicated directly and sco00 won't be
implicated...is it correct ?

Thank you in advance...
Cristian

.

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