RAC interconnect cannot configure MTU = 65520
Oracle RAC install with Infiniband interconnect.
Cannot get MTU set to 65520.
I continue to get SIOCSIFMTU: Invalid argument when starting the ib0 interface.
Any thoughts or suggestions ?
check the mode of you ibx device
cat /sys/class/net/ib0/mode
datagram
cat /sys/class/net/ib0/mode
connected
If mode is set to datagram you maximum mtu will be limited to 2044, else you can go to 65k -- all this depends on your hardware ofcourse, but these are most common settings.
you an change it in several ways
configure /etc/infiniband/openib.conf file
SET_IPOIB_CM=no / yes depending on your need
echo connected / datagram > /sys/class/net/ib0/mode
check you documentation for other ways.
Similar Messages
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Oracle RAC Interconnect, PowerVM VLANs, and the Limit of 20
Hello,
Our company has a requirement to build a multitude of Oracle RAC clusters on AIX using Power VM on 770s and 795 hardware.
We presently have 802.1q trunking configured on our Virtual I/O Servers, and have currently consumed 12 of 20 allowed VLANs for a virtual ethernet adapter. We have read the Oracle RAC FAQ on Oracle Metalink and it seems to otherwise discourage the use of sharing these interconnect VLANs between different clusters. This puts us in a scalability bind; IBM limits VLANs to 20 and Oracle says there is a one-to-one relationship between VLANs and subnets and RAC clusters. We must assume we have a fixed number of network interfaces available and that we absolutely have to leverage virtualized network hardware in order to build these environments. "add more network adapters to VIO" isn't an acceptable solution for us.
Does anyone know if Oracle can afford any flexibility which would allow us to host multiple Oracle RAC interconnects on the same 802.1q trunk VLAN? We will independently guarantee the bandwidth, latency, and redundancy requirements are met for proper Oracle RAC performance, however we don't want a design "flaw" to cause us supportability issues in the future.
We'd like it very much if we could have a bunch of two-node clusters all sharing the same private interconnect. For example:
Cluster 1, node 1: 192.168.16.2 / 255.255.255.0 / VLAN 16
Cluster 1, node 2: 192.168.16.3 / 255.255.255.0 / VLAN 16
Cluster 2, node 1: 192.168.16.4 / 255.255.255.0 / VLAN 16
Cluster 2, node 2: 192.168.16.5 / 255.255.255.0 / VLAN 16
Cluster 3, node 1: 192.168.16.6 / 255.255.255.0 / VLAN 16
Cluster 3, node 2: 192.168.16.7 / 255.255.255.0 / VLAN 16
Cluster 4, node 1: 192.168.16.8 / 255.255.255.0 / VLAN 16
Cluster 4, node 2: 192.168.16.9 / 255.255.255.0 / VLAN 16
etc.
Whereas the concern is that Oracle Corp will only support us if we do this:
Cluster 1, node 1: 192.168.16.2 / 255.255.255.0 / VLAN 16
Cluster 1, node 2: 192.168.16.3 / 255.255.255.0 / VLAN 16
Cluster 2, node 1: 192.168.17.2 / 255.255.255.0 / VLAN 17
Cluster 2, node 2: 192.168.17.3 / 255.255.255.0 / VLAN 17
Cluster 3, node 1: 192.168.18.2 / 255.255.255.0 / VLAN 18
Cluster 3, node 2: 192.168.18.3 / 255.255.255.0 / VLAN 18
Cluster 4, node 1: 192.168.19.2 / 255.255.255.0 / VLAN 19
Cluster 4, node 2: 192.168.19.3 / 255.255.255.0 / VLAN 19
Which eats one VLAN per RAC cluster.Thank you for your answer!!
I think I roughly understand the argument behind a 2-node RAC and a 3-node or greater RAC. We, unfortunately, were provided with two physical pieces of hardware to virtualize to support production (and two more to support non-production) and as a result we really have no place to host a third RAC node without placing it within the same "failure domain" (I hate that term) as one of the other nodes.
My role is primarily as a system engineer, and, generally speaking, our main goals are eliminating single points of failure. We may be misusing 2-node RACs to eliminate single points of failure since it seems to violate the real intentions behind RAC, which is used more appropriately to scale wide to many nodes. Unfortunately, we've scaled out to only two nodes, and opted to scale these two nodes up, making them huge with many CPUs and lots of memory.
Other options, notably the active-passive failover cluster we have in HACMP or PowerHA on the AIX / IBM Power platform is unattractive as the standby node drives no resources yet must consume CPU and memory resources so that it is prepared for a failover of the primary node. We use HACMP / PowerHA with Oracle and it works nice, however Oracle RAC, even in a two-node configuration, drives load on both nodes unlike with an active-passive clustering technology.
All that aside, I am posing the question to both IBM, our Oracle DBAs (whom will ask Oracle Support). Typically the answers we get vary widely depending on the experience and skill level of the support personnel we get on both the Oracle and IBM sides... so on a suggestion from a colleague (Hi Kevin!) I posted here. I'm concerned that the answer from Oracle Support will unthinkingly be "you can't do that, my script says to tell you the absolute most rigid interpretation of the support document" while all the time the same document talks of the use of NFS and/or iSCSI storage eye roll
We have a massive deployment of Oracle EBS and honestly the interconnect doesn't even touch 100mbit speeds even though the configuration has been checked multiple times by Oracle and IBM and with the knowledge that Oracle EBS is supposed to heavily leverage RAC. I haven't met a single person who doesn't look at our environment and suggest jumbo frames. It's a joke at this point... comments like "OMG YOU DON'T HAVE JUMBO FRAMES" and/or "OMG YOU'RE NOT USING INFINIBAND WHATTA NOOB" are commonplace when new DBAs are hired. I maintain that the utilization numbers don't support this.
I can tell you that we have 8Gb fiber channel storage and 10Gb network connectivity. I would probably assume that there were a bottleneck in the storage infrastructure first. But alas, I digress.
Mainly I'm looking for a real-world answer to this question. Aside from violating every last recommendation and making oracle support folk gently weep at the suggestion, are there any issues with sharing interconnects between RAC environments that will prevent it's functionality and/or reduce it's stability?
We have rapid spanning tree configured, as far as I know, and our network folks have tuned the timers razor thin. We have Nexus 5k and Nexus 7k network infrastructure. The typical issues you'd fine with standard spanning tree really don't affect us because our network people are just that damn good. -
Hi,
We are facing RAC Interconnect performance problems.
Oracle Version: Oracle 9i RAC (9.2.0.7)
Operating system: SunOS 5.8
SQL> SELECT b1.inst_id, b2.value "RECEIVED",
b1.value "RECEIVE TIME",
((b1.value / b2.value) * 10) "AVG RECEIVE TIME (ms)"
FROM gv$sysstat b1, gv$sysstat b2
WHERE b1.name = 'global cache cr block receive time'
AND b2.name = 'global cache cr blocks received'
AND b1.inst_id = b2.inst_id;
INST_ID RECEIVED RECEIVE TIME AVG RECEIVE TIME (ms)
1 323849 172359 5.32220263
2 675806 94537 1.39887778
After database restart average time increases for Instance 1 and instance 2 remains similar.
Application performance degrades, restart database solves the issue. This is critical application and can not have frequent downtimes for restart.
What specific points should I check to find out to improve interconnect performance?
Thanks
Dilip Patel.Hi,
Configurations:
Node: 1
Hardware Model: Sun-Fire-V890
OS: SunOS 5.8
Release: Generic_117350-53
CPU: 16 sparcv9 cpu(s) running at 1200 MHz
Memory: 40.0GB
Node: 2
Hardware Model: Sun-Fire-V890
OS: SunOS 5.8
Release: Generic_117350-53
CPU: 16 sparcv9 cpu(s) running at 1200 MHz
Memory: 40.0GB
CPU Utilization on Node 1 is never exceeded 40%.
CPU Utilization on Node 2 is between 20% to 30%.
Application load is more Node 1 compared to Node 2.
I can observer wait event "global cache cr request" in top 5 wait events on most of the statspack report. Application faces degrade performacne after few days of restart database. No major changes done on application recently.
Statapack report for Node 1:
DB Name DB Id Instance Inst Num Release Cluster Host
XXXX 2753907139 xxxx1 1 9.2.0.7.0 YES xxxxx
Snap Id Snap Time Sessions Curs/Sess Comment
Begin Snap: 61688 17-Feb-09 09:10:06 253 299.4
End Snap: 61698 17-Feb-09 10:10:06 285 271.6
Elapsed: 60.00 (mins)
Cache Sizes (end)
~~~~~~~~~~~~~~~~~
Buffer Cache: 2,048M Std Block Size: 8K
Shared Pool Size: 384M Log Buffer: 2,048K
Load Profile
~~~~~~~~~~~~ Per Second Per Transaction
Redo size: 102,034.92 4,824.60
Logical reads: 60,920.35 2,880.55
Block changes: 986.07 46.63
Physical reads: 1,981.12 93.67
Physical writes: 28.30 1.34
User calls: 2,651.63 125.38
Parses: 500.89 23.68
Hard parses: 21.44 1.01
Sorts: 66.91 3.16
Logons: 3.69 0.17
Executes: 553.34 26.16
Transactions: 21.15
% Blocks changed per Read: 1.62 Recursive Call %: 22.21
Rollback per transaction %: 2.90 Rows per Sort: 7.44
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 99.99 Redo NoWait %: 100.00
Buffer Hit %: 96.75 In-memory Sort %: 100.00
Library Hit %: 98.30 Soft Parse %: 95.72
Execute to Parse %: 9.48 Latch Hit %: 99.37
Parse CPU to Parse Elapsd %: 90.03 % Non-Parse CPU: 92.97
Shared Pool Statistics Begin End
Memory Usage %: 94.23 94.93
% SQL with executions>1: 74.96 74.66
% Memory for SQL w/exec>1: 82.93 72.26
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~ % Total
Event Waits Time (s) Ela Time
db file sequential read 1,080,532 13,191 40.94
CPU time 10,183 31.60
db file scattered read 456,075 3,977 12.34
wait for unread message on broadcast channel 4,195 2,770 8.60
global cache cr request 1,633,056 873 2.71
Cluster Statistics for DB: EPIP Instance: epip1 Snaps: 61688 -61698
Global Cache Service - Workload Characteristics
Ave global cache get time (ms): 0.8
Ave global cache convert time (ms): 1.1
Ave build time for CR block (ms): 0.1
Ave flush time for CR block (ms): 0.2
Ave send time for CR block (ms): 0.3
Ave time to process CR block request (ms): 0.6
Ave receive time for CR block (ms): 4.4
Ave pin time for current block (ms): 0.2
Ave flush time for current block (ms): 0.0
Ave send time for current block (ms): 0.3
Ave time to process current block request (ms): 0.5
Ave receive time for current block (ms): 2.6
Global cache hit ratio: 3.9
Ratio of current block defers: 0.0
% of messages sent for buffer gets: 3.7
% of remote buffer gets: 0.3
Ratio of I/O for coherence: 1.1
Ratio of local vs remote work: 10.9
Ratio of fusion vs physical writes: 0.0
Global Enqueue Service Statistics
Ave global lock get time (ms): 0.1
Ave global lock convert time (ms): 0.0
Ratio of global lock gets vs global lock releases: 1.0
GCS and GES Messaging statistics
Ave message sent queue time (ms): 0.4
Ave message sent queue time on ksxp (ms): 1.8
Ave message received queue time (ms): 0.2
Ave GCS message process time (ms): 0.1
Ave GES message process time (ms): 0.0
% of direct sent messages: 8.0
% of indirect sent messages: 49.4
% of flow controlled messages: 42.6
GES Statistics for DB: EPIP Instance: epip1 Snaps: 61688 -61698
Statistic Total per Second per Trans
dynamically allocated gcs resourc 0 0.0 0.0
dynamically allocated gcs shadows 0 0.0 0.0
flow control messages received 0 0.0 0.0
flow control messages sent 0 0.0 0.0
gcs ast xid 0 0.0 0.0
gcs blocked converts 2,830 0.8 0.0
gcs blocked cr converts 7,677 2.1 0.1
gcs compatible basts 5 0.0 0.0
gcs compatible cr basts (global) 142 0.0 0.0
gcs compatible cr basts (local) 142,678 39.6 1.9
gcs cr basts to PIs 0 0.0 0.0
gcs cr serve without current lock 0 0.0 0.0
gcs error msgs 0 0.0 0.0
gcs flush pi msgs 798 0.2 0.0
gcs forward cr to pinged instance 0 0.0 0.0
gcs immediate (compatible) conver 9,296 2.6 0.1
gcs immediate (null) converts 52,460 14.6 0.7
gcs immediate cr (compatible) con 752,507 209.0 9.9
gcs immediate cr (null) converts 4,047,959 1,124.4 53.2
gcs msgs process time(ms) 153,618 42.7 2.0
gcs msgs received 2,287,640 635.5 30.0
gcs out-of-order msgs 0 0.0 0.0
gcs pings refused 70,099 19.5 0.9
gcs queued converts 0 0.0 0.0
gcs recovery claim msgs 0 0.0 0.0
gcs refuse xid 1 0.0 0.0
gcs retry convert request 0 0.0 0.0
gcs side channel msgs actual 40,400 11.2 0.5
gcs side channel msgs logical 4,039,700 1,122.1 53.1
gcs write notification msgs 46 0.0 0.0
gcs write request msgs 972 0.3 0.0
gcs writes refused 4 0.0 0.0
ges msgs process time(ms) 2,713 0.8 0.0
ges msgs received 73,687 20.5 1.0
global posts dropped 0 0.0 0.0
global posts queue time 0 0.0 0.0
global posts queued 0 0.0 0.0
global posts requested 0 0.0 0.0
global posts sent 0 0.0 0.0
implicit batch messages received 288,801 80.2 3.8
implicit batch messages sent 622,610 172.9 8.2
lmd msg send time(ms) 2,148 0.6 0.0
lms(s) msg send time(ms) 1 0.0 0.0
messages flow controlled 3,473,393 964.8 45.6
messages received actual 765,292 212.6 10.1
messages received logical 2,360,972 655.8 31.0
messages sent directly 654,760 181.9 8.6
messages sent indirectly 4,027,924 1,118.9 52.9
msgs causing lmd to send msgs 33,481 9.3 0.4
msgs causing lms(s) to send msgs 13,220 3.7 0.2
msgs received queue time (ms) 379,304 105.4 5.0
msgs received queued 2,359,723 655.5 31.0
msgs sent queue time (ms) 1,514,305 420.6 19.9
msgs sent queue time on ksxp (ms) 4,349,174 1,208.1 57.1
msgs sent queued 4,032,426 1,120.1 53.0
msgs sent queued on ksxp 2,415,381 670.9 31.7
GES Statistics for DB: EPIP Instance: epip1 Snaps: 61688 -61698
Statistic Total per Second per Trans
process batch messages received 278,174 77.3 3.7
process batch messages sent 913,611 253.8 12.0
Wait Events for DB: EPIP Instance: epip1 Snaps: 61688 -61698
-> s - second
-> cs - centisecond - 100th of a second
-> ms - millisecond - 1000th of a second
-> us - microsecond - 1000000th of a second
-> ordered by wait time desc, waits desc (idle events last)
Avg
Total Wait wait Waits
Event Waits Timeouts Time (s) (ms) /txn
db file sequential read 1,080,532 0 13,191 12 14.2
db file scattered read 456,075 0 3,977 9 6.0
wait for unread message on b 4,195 1,838 2,770 660 0.1
global cache cr request 1,633,056 8,417 873 1 21.4
db file parallel write 8,243 0 260 32 0.1
buffer busy waits 16,811 0 168 10 0.2
log file parallel write 187,783 0 158 1 2.5
log file sync 75,143 0 147 2 1.0
buffer busy global CR 9,713 0 102 10 0.1
global cache open x 31,157 1,230 50 2 0.4
enqueue 58,261 14 45 1 0.8
latch free 33,398 7,610 44 1 0.4
direct path read (lob) 9,925 0 36 4 0.1
library cache pin 8,777 1 34 4 0.1
SQL*Net break/reset to clien 82,982 0 32 0 1.1
log file sequential read 409 0 31 75 0.0
log switch/archive 3 3 29 9770 0.0
SQL*Net more data to client 201,538 0 16 0 2.6
global cache open s 8,585 342 14 2 0.1
global cache s to x 11,098 148 11 1 0.1
control file sequential read 6,845 0 8 1 0.1
db file parallel read 1,569 0 7 4 0.0
log file switch completion 35 0 7 194 0.0
row cache lock 15,780 0 6 0 0.2
process startup 69 0 6 82 0.0
global cache null to x 1,759 48 6 3 0.0
direct path write (lob) 685 0 5 7 0.0
DFS lock handle 8,713 0 3 0 0.1
control file parallel write 1,350 0 2 2 0.0
wait for master scn 1,194 0 1 1 0.0
CGS wait for IPC msg 30,830 30,715 1 0 0.4
global cache busy 14 1 1 75 0.0
ksxr poll remote instances 30,997 12,692 1 0 0.4
direct path read 752 0 0 1 0.0
switch logfile command 3 0 0 148 0.0
log file single write 24 0 0 13 0.0
library cache lock 668 0 0 0 0.0
KJC: Wait for msg sends to c 1,161 0 0 0 0.0
buffer busy global cache 26 0 0 6 0.0
IPC send completion sync 261 260 0 0 0.0
PX Deq: reap credit 3,477 3,440 0 0 0.0
LGWR wait for redo copy 1,751 0 0 0 0.0
async disk IO 1,059 0 0 0 0.0
direct path write 298 0 0 0 0.0
slave TJ process wait 1 1 0 18 0.0
PX Deq: Execute Reply 3 1 0 3 0.0
PX Deq: Join ACK 8 4 0 1 0.0
global cache null to s 8 0 0 1 0.0
ges inquiry response 16 0 0 0 0.0
Wait Events for DB: EPIP Instance: epip1 Snaps: 61688 -61698
-> s - second
-> cs - centisecond - 100th of a second
-> ms - millisecond - 1000th of a second
-> us - microsecond - 1000000th of a second
-> ordered by wait time desc, waits desc (idle events last)
Avg
Total Wait wait Waits
Event Waits Timeouts Time (s) (ms) /txn
PX Deq: Parse Reply 6 2 0 1 0.0
PX Deq Credit: send blkd 2 1 0 0 0.0
PX Deq: Signal ACK 3 1 0 0 0.0
library cache load lock 1 0 0 0 0.0
buffer deadlock 6 6 0 0 0.0
lock escalate retry 4 4 0 0 0.0
SQL*Net message from client 9,470,867 0 643,285 68 124.4
queue messages 42,829 41,144 42,888 1001 0.6
wakeup time manager 601 600 16,751 27872 0.0
gcs remote message 795,414 120,163 13,606 17 10.4
jobq slave wait 2,546 2,462 7,375 2897 0.0
PX Idle Wait 2,895 2,841 7,021 2425 0.0
virtual circuit status 120 120 3,513 29273 0.0
ges remote message 142,306 69,912 3,504 25 1.9
SQL*Net more data from clien 206,559 0 19 0 2.7
SQL*Net message to client 9,470,903 0 14 0 124.4
PX Deq: Execution Msg 313 103 2 7 0.0
Background Wait Events for DB: EPIP Instance: epip1 Snaps: 61688 -61698
-> ordered by wait time desc, waits desc (idle events last)
Avg
Total Wait wait Waits
Event Waits Timeouts Time (s) (ms) /txn
db file parallel write 8,243 0 260 32 0.1
log file parallel write 187,797 0 158 1 2.5
log file sequential read 316 0 22 70 0.0
enqueue 56,204 0 15 0 0.7
control file sequential read 5,694 0 6 1 0.1
DFS lock handle 8,682 0 3 0 0.1
db file sequential read 276 0 2 8 0.0
control file parallel write 1,334 0 2 2 0.0
wait for master scn 1,194 0 1 1 0.0
CGS wait for IPC msg 30,830 30,714 1 0 0.4
ksxr poll remote instances 30,972 12,681 1 0 0.4
latch free 356 54 1 2 0.0
direct path read 752 0 0 1 0.0
log file single write 24 0 0 13 0.0
LGWR wait for redo copy 1,751 0 0 0 0.0
async disk IO 812 0 0 0 0.0
global cache cr request 69 0 0 1 0.0
row cache lock 45 0 0 1 0.0
direct path write 298 0 0 0 0.0
library cache pin 29 0 0 1 0.0
rdbms ipc reply 29 0 0 0 0.0
buffer busy waits 10 0 0 0 0.0
library cache lock 2 0 0 0 0.0
global cache open x 2 0 0 0 0.0
rdbms ipc message 179,764 36,258 29,215 163 2.4
gcs remote message 795,409 120,169 13,605 17 10.4
pmon timer 1,388 1,388 3,508 2527 0.0
ges remote message 142,295 69,912 3,504 25 1.9
smon timer 414 0 3,463 8366 0.0
------------------------------------------------------------- -
RAC Interconnect Transfer rate vs NIC's Bandwidth
Hi Guru,
I need some clarification for RAC interconnect terminology between "private interconnect transfer rate" and "NIC bandwidth".
We have 11gR2 RAC with multiple databases.
So we need to find out what the current resource status is.
We have two physical NICs each node. And 8G is for public and 2G is for private (interconnect).
Technically, we have 4G for Private network bandwidth.
If I look at the "Private Interconnect Transfer rate" though OEM or IPTraf (linux tool), it is showing 20 ~30 MB/Sec.
There is no any issue at all at this moment.
Please correct me if I am wrong.
The transfer rate will be fine till 500M or 1G/Sec. Because the current NIC's capacity is 4G. Does it make sense ?
I'm sure there are multiple things to consider,but I'm kind of stumped on the whole transfer rate vs bandwidth. Is there any way to calculate what a typical transfer would be....
OR How do I say our interconnect are good enough ....based on the transfer rate ?
Another question is ....
In our case, how do I set up the warning threshold and Critical threshold for "Private Interconnect Transer rate" in OEM ?
Any comments will be appreciated.
Please advise.Interconnect performance sways more to latency than bandwidth IMO. In simplistic terms, memory is shared across the Interconnect. What is important for accessing memory? The size of the pipe? Or the speed of the pipe?
A very fast small pipe will typically perform significantly better than a large and slower pipe.
Even the size of the pipe is not that straight forward. Standard IP MTU size is 1500. You can run jumbo and super-jumbo frame MTU sizes on the Interconnect - where for example a MTU size of 65K is significantly larger than a 1500 byte MTU. Which means significantly more data can be transferred over the Interconnect at a much reduced overhead.
Personally, I would not consider Ethernet (GigE included) for the Interconnect. Infiniband is faster, more scalable, and offers an actual growth path to 128Gb/s and higher.
Oracle also uses Infiniband (QDR/40Gb) for their Exadata Database Machine product's Interconnect. Infiniband also enables one to run Oracle Interconnect over RDS instead of UDP. I've seen Oracle reports to the OFED committee saying that using RDS in comparison with UDP, reduced CPU utilisation by 50% and decreased latency by 50%.
I also do not see the logic of having a faster public network and a slower Interconnect.
IMO there are 2 very fundamental components in RAC that determines what is the speed and performance achievable with that RAC - the speed, performance and scalability of the I/O fabric layer and for the Interconnect layer.
And Exadata btw uses Infiniband for both these critical layers. Not fibre. Not GigE. -
Dedicated switches needed for RAC interconnect or not?
Currently working on an Extended RAC cluster design implementation, I asked the network engineer for dedicated switches for the RAC interconnects.
Here is a little background:
There are 28 RAC clusters over 2X13 physical RAC nodes with separate Oracle_Home for each instance with atleast 2+ instances on each RAC node. So 13 RAC nodes will be in each site(Data-Center). This is basically an Extended RAC solution for SAP databases on RHEL 6 using ASM and Clusterware for Oracle 11gR2. The RAC nodes are Blades in a c7000 enclosure (in each site). The distance between the sites is 55+ kms.
Oracle recommends to have Infiniband(20GBps) as the network backbone, but here DWDM will be used with 2X10 Gbps (each at 10 GBps) links for the RAC interconnect between the sites. There will be separate 2x1GBps redundant link for the Production network and 2x2 GBps FC(Fiber-Channel) redundant links for the SAN/Storage(ASM traffic will go here) network. There will be switches for the Public-production network and the SAN network each.
Oracle recommends dedicated switches(which will give acceptable latency/bandwith) with switch redundancy to route the dedicated/non-routable VLANs for the RAC interconnect (private/heartbeat/global cache transfer) network. Since the DWDM interlinks is 2x10Gbps - do I still need the dedicated switches?
If yes, then how many?
Your inputs will be greatly appreciated.. and help me take a decision.
Many Thanks in advance..
AbhijitAbsolutely agree.. the chances of overload in a HA(RAC) solution and ultmate RAC node eviction are very high(with very high latency) and for exactly this reason I even suggested inexpensive switches to route the VLANs for the RAC interconnect through these switches. The ASM traffic will get routed through the 2x2GB FC links through SAN-Directors (1 in each site).
Suggested the network folks to use Up-links from the c7000 enclosure and route the RAC VLAN through these inexpensive switches for the interconnect traffic. We have another challenge here: HP has certified using VirtualConnect/Flex-Fabric architecture for Blades in c7000 to allocate VLANs for RAC interconnect. But this is only for one site, and does not span Production/DR sites separated over a distance.
Btw, do you have any standard switch model to select from.. and how many to go for a RAC configuration of 13 Extended RAC clusters with each cluster hosting 2+ RAC instances to host total of 28 SAP instances.
Many Thanks again!
Abhijit -
Teamed NICs for RAC interconnect
Hi there,
We have an Oralce 10g RAC with 2 nodes. there are only one NIC for RAC interconnect in both servers.
now we want to add one redundant NIC into each server for RAC interconnect as well.
Could you please guide me some documents about this "teamed NICs for RAC interconnect "?
Your help is greatly appreciated!
Thanks,
ScottSearch around for NIC bonding. The exact process will depend on your OS.
Linux, see Metalink note 298891.1 - Configuring Linux for the Oracle 10g VIP or private interconnect using bonding driver
Regards,
Greg Rahn
http://structureddata.org -
Cannot configure my iPhone 3gs after i have updated from 5.1.1 to os 6.0
hi i need some help, im using iphone 3gs, when i connect it to my mac it says theres an update to my iphone which i did install, but few minutes after its telling me that i need to restore my iPhone. i did restore it but i cannot configure it anymore, in itunes it says there is no sim card installed in the iphone that your attempting to activate.
in itunes its telling me theres no sim card installed in the iphone you are attemptng to activate.
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Hello. First time using this. Still trying to figure out how to post my questions. I seem to have lost some of my settings and now I cannot configure my airport connection. How do I get my settings back?
If you are using cable and a Nethear router sounds like from the information you provide before your Airport setting are setup improperly. PPoE is not something a cable service would need to work. Fallow the steps I will provide bellow, I will add some screen shots also to assist if necessary.
1 - Open System Preferences from (Menu)
2 - Click "Network"
3 - From the Network window you are going to wanna make sure Location is : Automatic and Show is : Airport
4 - Once the Show: Airport is select you should see a window like this, my window is selected for Ethernet simply because I am no longer running Tiger but the window will look the same.
5 - You will want to click on the PPPoE tab and you should see this
6 - You're gonna wanna make sure " connection using PPPoE " is not select, if it is make sure to uncheck this option
7 - Once this is uncheck make sure to click "Apply Now"
8 - You will want to click back on to the "TCP/IP" tab and make sure IPv4 is set to " Using DHCP "
9 - If the option to " Apply Now" is available again please click this
10 - Once this is done go to your Aiport Menu and see if your network is listed and select your network and eneter the password if necessary.
11 - If after these steps you still have issues I would recommend Power Cylcing your Router and Modem for about 5 minutes
12 - Make sure all lights are off when unplugging the Router and the Modem
13 - Some Modems have backup batterys so you may have to push in a tiny button on the back with a pin -
I cannot configure pop account in mail, says it is offline. What to do?
I cannot configure pop account in mail, says it is offline. What to do?
Welcome to Apple Communities
Download it here and install. Sometimes the download fails with Software Update -
Please assist with the iMessage configuration. My iMessage used to work with the previous version. With 6.1 I cannot configure iMessage properly. After I sign in using my apple id. It directs me to the next page with all the email add associated with the I. d. After confirming the email addresses it verifies then reverts back to the previous page with the sign in portion. What should I do?
Using FaceTime http://support.apple.com/kb/ht4319
Troubleshooting FaceTime http://support.apple.com/kb/TS3367
The Complete Guide to FaceTime + iMessage: Setup, Use, and Troubleshooting
http://tinyurl.com/a7odey8
Troubleshooting FaceTime and iMessage activation
http://support.apple.com/kb/TS4268
Using FaceTime and iMessage behind a firewall
http://support.apple.com/kb/HT4245
iOS: About Messages
http://support.apple.com/kb/HT3529
Set up iMessage
http://www.apple.com/ca/ios/messages/
Troubleshooting Messages
http://support.apple.com/kb/TS2755
Setting Up Multiple iOS Devices for iMessage and Facetime
http://macmost.com/setting-up-multiple-ios-devices-for-messages-and-facetime.htm l
FaceTime and iMessage not accepting Apple ID password
http://www.ilounge.com/index.php/articles/comments/facetime-and-imessage-not-acc epting-apple-id-password/
Unable to use FaceTime and iMessage with my apple ID
https://discussions.apple.com/thread/4649373?tstart=90
For non-Apple devices, check out the TextFree app https://itunes.apple.com/us/app/text-free-textfree-sms-real/id399355755?mt=8
Cheers, Tom -
ADOBE 12.exe downloaded. FLASH will download but won't install. The error message is "CANNOT CONFIGURE
APPLICATION."You can try to run the Flash installer as Administrator.
Latest Flash player versions here:
*http://www.adobe.com/special/products/flashplayer/fp_distribution3.html -
802.3ad (mode=4) bonding for RAC interconnects
Is anyone using 802.3ad (mode=4) bonding for their RAC interconnects? We have five Dell R710 RAC nodes and we're trying to use the four onboard Broadcom NetXtreme II NICs in a 802.3ad bond with src-dst-mac load balancing. Since we have the hardware to pull this off we thought we'd give it a try and achieve some extra bandwith for the interconnect rather than deploying the traditional acitve/standby interconnect using just two of the NICs. Has anyone tried this config and what was the outcome? Thanks.
I don't but may be the documents might help ?
http://www.iop.org/EJ/article/1742-6596/119/4/042015/jpconf8_119_042015.pdf?request-id=bcddc94d-7727-4a8a-8201-4d1b837a1eac
http://www.oracleracsig.org/pls/apex/Z?p_url=RAC_SIG.download_my_file?p_file=1002938&p_id=1002938&p_cat=documents&p_user=nobody&p_company=994323795175833
http://www.oracle.com/technology/global/cn/events/download/ccb/10g_rac_bp_en.pdf
Edited by: Hub on Nov 18, 2009 10:10 AM -
Oracle database 10g RAc an ASM configuration
Hi all,
I want to ask to everybody something about Oracle 10g RAC and ASm configuration. We plan to migrate to Oracle 10g from 9i, and we will begin configuring oracle but we have to decide which configuration are the best.
Our materials are bellow:
Hardware: RP 3440 (HP)
OS : HPUX 11i Ver 1
Storage: EVA 4000 (eva disk group)
The problem is:
Our supplier recommand us to use HP serviguard + HP serviceguard extension for RAC+ RAc and Raw device as configuration.
But we want to use Oracekl Clusterware + RAC + ASM
My question is if anybody know what is the best configuration, we want to use ASm.
Can we use HP serviguard and ASM.
Some documentations or link explain oracle RAC and ASM configuration will be appreciate.
Thanks for your help.
Regards.
raitsarevoHello,
there's no extra RAC software package, but the option is only offered, if one of the supported cluster layers for the respective OS has been installed before.
10.1.0.3 looks like a complete redesign, but anyway it is a patch, you have to install 10.1.0.2 first. -
Every time i try to update adobe shockwave i get a cannot configure messege
when i run the add - on manager check to see if your plug-ins are outdated --- it tells me i need to update adobe shockwave--- i go through the steps to download and it gives me an error Host cannot configure--- i have a gateway pc with windows 8 that will not update to windows 8.1 is there anything you can do to help?
Perform a clean installation of Flash Player as follows.
# From the following page, save the uninstaller somewhere handy, like the desktop.
#* [http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html#main_Download_the_Adobe_Flash_Player_uninstaller Uninstall Flash Player for Windows | Adobe Support]
# From the following page, save the installer for other browsers. If you also use Flash Player in Internet Explorer, also save the ActiveX version.
#* [http://helpx.adobe.com/flash-player/kb/installation-problems-flash-player-windows.html#main-pars_text_4 Direct downloads of Flash Player for Windows | Adobe Support]
# Exit all applications.
# Run the uninstaller.
# In Windows Explorer, try to open the following folders. If they still exist, delete them manually.
#* <pre>C:\Windows\system32\Macromed\Flash\</pre>
#* <pre>C:\Windows\SysWOW64\Macromed\Flash\</pre>
#* <pre>%AppData%\Adobe\Flash Player\</pre>
#* <pre>%AppData%\Macromedia\Flash Player\</pre>
# Restart your computer.
# Run the installer for other browsers.
# Run the ActiveX installer if you downloaded it. -
Oracle database 10g RAC and ASM configuration
Hi all,
I want to ask to everybody something about Oracle 10g RAC and ASm configuration. We plan to migrate to Oracle 10g from 9i, and we will begin configuring oracle but we have to decide which configuration are the best.
Our materials are bellow:
Hardware: RP 3440 (HP)
OS : HPUX 11i Ver 1
Storage: EVA 4000 (eva disk group)
The problem is:
Our supplier recommand us to use HP serviguard + HP serviceguard extension for RAC+ RAc and Raw device as configuration.
But we want to use Oracekl Clusterware + RAC + ASM
My question is if anybody know what is the best configuration, we want to use ASm.
Can we use HP serviguard and ASM.
Some documentations or link explain oracle RAC and ASM configuration will be appreciate.
Thanks for your help.
Regards.
raitsarevoHello,
there's no extra RAC software package, but the option is only offered, if one of the supported cluster layers for the respective OS has been installed before.
10.1.0.3 looks like a complete redesign, but anyway it is a patch, you have to install 10.1.0.2 first.
Maybe you are looking for
-
Set default filename for file save dialog on Save button click
Hi, I am using AxAcroPDF (version 9.0) control to view pdf files in windows forms (C#). The pdf loads into the viewer in the form. Now, when I click on the Save button in the viewer, a Save dialog pops up with a default filename having complete path
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24" iMac Calibration issue PLEASE HELP!!!
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JDBC---RFC will Support Sync?????????
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IS OPENING ISOs A PROBLEM FOR YOU ?
Hello to everybody, Here's what I found last night : *http://www.poweriso.com/download.htm* and on bottom of page : "PowerISO for OSX -- This is a free utility for Mac OSX which can extract, list, and convert image files (including ISO, BIN, DAA, an