Calling Acp Neeku Rac Interview Pedutunna..tondaraga Raa!

[k2s]

[quote name='PMR aka OM' timestamp='1324402499' post='1301170977']

Andhukey kada , memu asalu build start seyyakunda mee ku oka 30 days mundhi request petti , pani avaganey vachi request petti 30 days ayyindi , ippudaina pani seyyandayya ani adugutaaamu..

[/quote]

we are very busy u know.....

[PMREDDY19]

[quote name='k2s' timestamp='1324402593' post='1301170982']

we are very busy u know.....
[/quote]

Telusley ,, a desam nundi evadu vachi ekkkada bokka lo emi pedataado ani mee jaagratha lo meeru ,,

condooms vesi unchutaaru kada n/w loki breach create chesi maaa Daggariki rakunda..

ayina kaani kodukulu maa apache meeda edho oka kotha technique tho atttack sesi dobbutaru,.


Ledantey server meedaki vachey automated requests tho overload chesi padestaaru , appudu Webserver gila gila kottuku sachipodhi..

malli daani kosam oka kkotha patch , version update...

[pavan_613]

vammoooo

[pavan_613]

[k2s]

[quote name='PMR aka OM' timestamp='1324402803' post='1301170993']

Telusley ,, a desam nundi evadu vachi ekkkada bokka lo emi pedataado ani mee jaagratha lo meeru ,,

condooms vesi unchutaaru kada n/w loki breach create chesi maaa Daggariki rakunda..

ayina kaani kodukulu maa apache meeda edho oka kotha technique tho atttack sesi dobbutaru,.


Ledantey server meedaki vachey automated requests tho overload chesi padestaaru , appudu Webserver gila gila kottuku sachipodhi..

malli daani kosam oka kkotha patch , version update...
[/quote]

adey bot crawling...

[PMREDDY19]

[quote name='CITI' timestamp='1324403474' post='1301171017']
vammoooo
[/quote]


e theddu motham sadivithey ,, nuvuv java ni vadilesi , Weblogic, Oracle DBA, Network admin gaa kuda try sesukovachu,...

[Gachibowli_Diwakar]

[quote name='PMR aka OM' timestamp='1324402077' post='1301170954']

Correstey ba,, inka neeku SAN lo LUNs antey telusaa ba. oka project lo daani meedda pedda lolli nadustundi naku..


nuuuvu velli tinupo,,mundhu..plate lo pettukoni raa mundhu..
[/quote]

DBA's scope is limited to gather information upto Filesystem reddy garu .. asalu volumes kuda maku out-of-scope .. yedho ma environment lo konni filesystems ki related volumes kanipisthaay kabatti ..naku telusu anthe

System Admins .. cluster chesi aah Luns ni provide chesi ..storage ki add chesthe .. we will take it from there

[tom bhayya]

[Gachibowli_Diwakar]

[quote name='PMR aka OM' timestamp='1324402803' post='1301170993']

Telusley ,, a desam nundi evadu vachi ekkkada bokka lo emi pedataado ani mee jaagratha lo meeru ,,

[color=#ff0000][b]condooms vesi unchutaaru kada n/w loki breach create chesi maaa Daggariki rakunda..[/b][/color]

ayina kaani kodukulu maa apache meeda edho oka kotha technique tho atttack sesi dobbutaru,.


Ledantey server meedaki vachey automated requests tho overload chesi padestaaru , appudu Webserver gila gila kottuku sachipodhi..

malli daani kosam oka kkotha patch , version update...
[/quote]

[Gachibowli_Diwakar]

[quote name='Alexander' timestamp='1324403672' post='1301171033']

[/quote]

[color=#282828][font=helvetica, arial, sans-serif][img]http://www.gifsoup.com/view7/2895029/brahmi-thinking-o.gif[/img][/font][/color][color=#282828][font=helvetica, arial, sans-serif] [/font][/color]

[RUDRAKSHA]

[quote name='Alexander' timestamp='1324403672' post='1301171033']

[/quote]

[Gachibowli_Diwakar]

[quote name='RUDRAKSHA' timestamp='1324403814' post='1301171046']


[/quote]
ba indhaaka nuvu adigina question ki answer .. if node 1 can reach to node4 .. and nodes 1 2 3 can communicate with each other .. how split brain syndrome works ante .. node 3 or node 4 1st ye node aithe node 4 ki connect avvaledho ..that will evict node 4 from cluster ..

ikada strategy simple .. if any of the nodes cannot ping to any other node in the cluster .. then the node which cannot ping to other node will evict that node from cluster

so .. logically speaking .. if nodes 2 and 3 can communicate to node 4 .. but node 1 cannot communicate to node 1 .. then the one that gets 1st will evict the other one .. ante either node 1 will evict node 4 .. or node 4 will evict node 1 ..

[RUDRAKSHA]

[quote name='Silence..Please' timestamp='1324404234' post='1301171085']
ba indhaaka nuvu adigina question ki answer .. if node 1 can reach to node4 .. and nodes 1 2 3 can communicate with each other .. how split brain syndrome works ante .. node 3 or node 4 1st ye node aithe node 4 ki connect avvaledho ..that will evict node 4 from cluster ..

ikada strategy simple .. if any of the nodes cannot ping to any other node in the cluster .. then the node which cannot ping to other node will evict that node from cluster

so .. logically speaking .. if nodes 2 and 3 can communicate to node 4 .. but node 1 cannot communicate to node 1 .. then the one that gets 1st will evict the other one .. ante either node 1 will evict node 4 .. or node 4 will evict node 1 ..
[/quote]

so here what is the role of voting disk .if nodes themselves can evict other dead node whats the use of voting disk.

[k2s]

[quote name='Silence..Please' timestamp='1324404234' post='1301171085']
ba indhaaka nuvu adigina question ki answer .. if node 1 can reach to node4 .. and nodes 1 2 3 can communicate with each other .. how split brain syndrome works ante .. node 3 or node 4 1st ye node aithe node 4 ki connect avvaledho ..that will evict node 4 from cluster ..

ikada strategy simple .. if any of the nodes cannot ping to any other node in the cluster .. then the node which cannot ping to other node will evict that node from cluster

so .. logically speaking .. if nodes 2 and 3 can communicate to node 4 .. but node 1 cannot communicate to node 1 .. then the one that gets 1st will evict the other one .. ante either node 1 will evict node 4 .. or node 4 will evict node 1 ..
[/quote]




[quote name='k2s' timestamp='1324401426' post='1301170900']

[size=5][color=#000000][font=tahoma, verdana, sans-serif]It occurs when the instance members in a RAC fail to ping/connect to each other via this private interconnect, but the servers are all pysically up and running and the database instance on each of these servers is also running. These individual nodes are running fine and can conceptually accept user connections and work independently. So basically due to lack of commincation the instance thinks that the other instance that it is not able to connect is down and it needs to do something about the situation. The problem is if we leave these instance running, the sane block might get read, updated in these individual instances and there would be data integrity issue, as the blocks changed in one instance, will not be locked and could be over-written by another instance. Oracle has efficiently implemented check for the split brain syndrome.[/font][/color][/size]


[size=5][color=#000000][font=tahoma, verdana, sans-serif]In RAC if any node becomes inactive, or if other nodes are unable to ping/connect to a node in the RAC, then the node which first detects that one of the node is not accessible, it will evict that node from the RAC group. e.g. there are 4 nodes in a rac instance, and node 3 becomes unavailable, and node 1 tries to connect to node 3 and finds it not responding, then node 1 will evict node 3 out of the RAC groups and will leave only Node1, Node2 & Node4 in the RAC group to continue functioning.[/font][/color][/size]

[size=5][color=#000000][font=tahoma, verdana, sans-serif]The split brain concepts can become more complicated in large RAC setups. For example there are 10 RAC nodes in a cluster. And say 4 nodes are not able to communicate with the other 6. So there are 2 groups formed in this 10 node RAC cluster ( one group of 4 nodes and other of 6 nodes). Now the nodes will quickly try to affirm their membership by locking controlfile, then the node that lock the controlfile will try to check the votes of the other nodes. The group with the most number of active nodes gets the preference and the others are evicted. Moreover, I have seen this node eviction issue with only 1 node getting evicted and the rest function fine, so I cannot really testify that if thats how it work by experience, but this is the theory behind it.[/font][/color][/size]
[color=#000000][font=tahoma, verdana, sans-serif]When we see that the node is evicted, usually oracle rac will reboot that node and try to do a cluster reconfiguration to include back the evicted node.[/font][/color]

[size=5][color=#000000][font=tahoma, verdana, sans-serif]You will see oracle error: ORA-29740, when there is a node eviction in RAC. There are many reasons for a node eviction like heart beat not received by the controlfile, unable to communicate with the clusterware etc.[/font][/color][/size]

[size=5][color=#000000][font=tahoma, verdana, sans-serif] [/font][/color][/size]
[/quote]

[PMREDDY19]

[quote name='Silence..Please' timestamp='1324403660' post='1301171031']

DBA's scope is limited to gather information upto Filesystem reddy garu .. asalu volumes kuda maku out-of-scope .. yedho ma environment lo konni filesystems ki related volumes kanipisthaay kabatti ..naku telusu anthe

System Admins .. cluster chesi aah Luns ni provide chesi ..storage ki add chesthe .. we will take it from there
[/quote]

ALa emi kaadhu baa,, maa Danilo , existing DB ni replicating ona newly built DEV servers akkkada unna sixxe disks ni kothaa servers loki kaavali antaaru ,

maa Storage vallu emo no way memu ala ivvatledhu ippdu, wehad one standardised size now a days.. so u need to take thisbig disk and partition on ur end ani edho cheptunnaru , naaku emo sagam sagam telusu ..

edho aa meetings lo coer up chesi manage chestunan now a days..