patch 19121549 is not applicable

Error : The opatch Applicable check failed.  The patch /tmp/19380115/19121549 is not applicable to /app/grid
Error:Patch Applicable check failed for /app/grid


SOLUTION : unset ORA_CRS_HOME , unset ORA_ASM_HOME
                    chown -R oracle:oinstall  /tmp/19380115

has a disk HB, but no network HB, DHB has rcfg

11gR2 GI Node May not Join the Cluster After Private Network is Functional After Eviction due to Private Network Problem (Doc ID 1479380.1)

do not use ext4 for oracle database files

http://kevinclosson.net/2012/03/06/yes-file-systems-still-need-to-support-concurrent-writes-yet-another-look-at-xfs-versus-ext4/

has a disk HB, but no network HB, DHB has rcfg

http://sqlsewer.blogspot.ro/2013/07/oracle-crs-is-not-starting-has-disk-hb.html

But if Ping and SSH did work between nodes via interconnect interface and still ocssd log did complain about interconnect HeartBeat (no network HB) then interconnect interface is jammed. You can try to restart it to get it fixed (NOTE! It is usually the working node interconnect interface that is needed to restart (like error message is saying in ocssd.log (it is complaining node1)). For example if node2 CRS is not starting then restart node1 interconnect interface ) :
[root@<node1> <node1>]# ifdown eth1
[root@<node1> <node1>]# ifup eth1
And check that eth1 is looking ok:
[root@<node1> <node1>]# ifconfig

See also http://oradbastuff.blogspot.ro/2014/11/has-disk-hb-but-no-network-hb-dhb-has_27.html 
Best idea : upgrade Gi to 11.2.0.4

ord

„Adevărata libetate n-are nimica de-a face cu neregula şi anarhia: fără datorii nu există drepturi, fără ordine nu-i libertate“.

how to measure latency and iops on netapp volumes

stats show -i 1 -n 10 -e volume:*:latency

stats show -i 2 -n 10 -e volume:*:ops

stats show -i 1 -n 10 -e system:system:ops 

linux tuning

http://www.slideshare.net/brendangregg/performance-tuning-ec2-instances

problems with 4 TB hard drive in B110i raid controller

The Smart Array B110i controller is not compatible with drives larger than 2TB in RAID. It's not well-documented or noted online, but you've run into a product limitation. Remember, this controller predates the introduction of 4TB disks by a bit.

If you need to use those specific 3rd party disks, then you're going to have to swap controllers or use software RAID.

serverfault.com 

custom ssd for proliant

http://h30499.www3.hp.com/t5/ProLiant-Servers-ML-DL-SL/Custom-SSD-Drives-in-Proliant-DL380/td-p/5804993#.VGHlEfmsUbg

http://serverfault.com/questions/528875/third-party-ssd-solutions-in-proliant-gen8-servers/528989#528989

http://serverfault.com/questions/521393/are-there-any-san-vendors-that-allow-third-party-drives/521395#521395

how to limit long running queries in oracle database

http://www.pythian.com/blog/oracle-limiting-query-runtime-without-killing-the-session/

nunta

http://smartwoman.hotnews.ro/Nunta-in-Romania-o-pierdere-de-timp-de-bani-de-nervi 

check number of files in a folder

http://serverfault.com/questions/192158/use-nagios-to-monitor-files-in-folders
Note : inside the script, you must modify the maxdepth  from 1 to 3 ( or whateever you want )