http://h18000.www1.hp.com/products/quickspecs/13258_div/13258_div.html
http://h10010.www1.hp.com/wwpc/us/en/sm/WF31a/12169-304612-304622-304622-304622-3936307.html
- Provide specs of MSL tape library
HP Integrity blade products
http://h18004.www1.hp.com/products/blades/components/c-class-integrity-bladeservers.html
HP Blade enclosures
http://h18004.www1.hp.com/products/blades/components/enclosures/c-class/index.html
HP Blade answer center
http://h30424.www3.hp.com/index.html?bpKey=Blades_Content_Menu#sc=&rm=598&sp=
HP Blade system power sizer
http://h71028.www7.hp.com/ActiveAnswers/cache/347628-0-0-0-121.html
HP Storage
http://h18000.www1.hp.com/products/quickspecs/12893_div/12893_div.html
Oracle
Weblogic server installation guide
http://download.oracle.com/docs/cd/E15523_01/doc.1111/e14142/prepare.htm#i1183981
20100701
20100630
Installing perl modules online
- need internet access to linux box
sudo perl -MCPAN -e 'install Config::IniFiles'
>>>> before that
#yum install perl-CPAN
>>> configure CPAN
# cpan
>> configure most of the steps in cpan
or from cpan
# cpan
cpan shell -- CPAN exploration and modules installation (v1.9205)
ReadLine support available (maybe install Bundle::CPAN or Bundle::CPANxxl?)
cpan[1]> install "Config::IniFiles";
sudo perl -MCPAN -e 'install Config::IniFiles'
>>>> before that
#yum install perl-CPAN
>>> configure CPAN
# cpan
>> configure most of the steps in cpan
or from cpan
# cpan
cpan shell -- CPAN exploration and modules installation (v1.9205)
ReadLine support available (maybe install Bundle::CPAN or Bundle::CPANxxl?)
cpan[1]> install "Config::IniFiles";
20100521
SSD - Solid State Devices
Solid states devices
Advantages:
Disadvantages:
SSD architecture and types:
NAND flash nonvolatile memory
Where is it used
Vendors and Martket share
When you hear Solid states devices, first point to loot is they are green.
Green , yeah they are engery efficient, fast, low form factor, best suited for next generation servers.
SSD is a collection of memory chips combined with additional technologies that allow it to appear as a normal hard drive. No doubt technology was invented in 1980 and first NAND drive was manufactured in 1989, but use of this became more seen in early 2010.
Solid state drives are data storage devices that uses solid state memory to store persistant data.
Advantages:
- Faster startup and access due to no moving parts
- Seek time is very less when compared to normal HDD.
- Data throughput is very much higher when compared to normal HDD.
- Uses low power and silient during all operations
- High mechanical reliability
- Endures high shocks, temperature, altitudes and vibrations
Disadvantages:
- Expencive
- Low capacity at same form factor
- Asymmetric performance
- Limited lifetimes - limted number of write opeartions
SSD architecture and types:
- SSD is of two types: NAND flash nonvolatile memory and DRAM volatile memory
NAND flash nonvolatile memory
- N-channel MOSFET again - Its the building block of NAND flash nonvolatile memory, required at 1 per cell.
- Nand based SSD uses non volatile flash memory and does not need a battery to retain the data.
- Flash based SSD are slower than DRAM based SSD.
- SSD work by directly writing into flash memroy - NAND Gates/cells.
- Data is written into cells at 1 bit at a time
- Cells are arranged into pages and these are grouped into blocks
- Pages ranges from 512 bytes to 4096 bytes
- Blocks ranges from 32 to 128 pages
- So a block can be anywhere between 16KB to 512KB
- Block size is important factor for Flash drive to work
- Data is written into drive as one bit at a time but is deleted at block level - block by block
- Block is marked BAD if the performance is dropped below normal acceptable level
- Data is moved avay from BAD blocks
- Writing data to SSD is sequencital just like magnetic tapes and optical devices.
- Fastest SSD
- Incorprates a builtin battery or will have an uninteruptted power supply
- Uses DRAM for data storage
- While is the power is off, data in RAM is copied to backup storage and soon after the power is restored the data is copied back to main RAM.
- Its like a SWAP space
- SSD Controller
- Processor - Firmware execution, garbage cleaning, caching and security functions
- ECC - Error correction code - Data error detection and correction
- Flash controller - For standard NAND gates I/O operations
- I/O Controller - SATA controller - External native hardware interface ( can be SAS also)
- Controller memory - ROM - used by controller for program execution
- Cache memory - for intermediate caching of data
Where is it used
Vendors and Martket share
20100420
things i forget
1. To change system date and time on linux
date -s "04/20/2010 14:22:00"
2. enable logging on Cisco firewall
logging on
logging timestamp
logging monitor debugging
logging trap informational
logging history critical
logging facility 23
logging device-id ipaddress inside
logging host inside 10.50.8.112
3. MRTG
mkdir /var/www/html/mrtg/devicename
/usr/bin/cfgmaker --global WorkDir:/var/www/html/mrtg/devicename/ --output /etc/mrtg/devicename.cfg snmpstring@devicename
indexmaker --output=/var/www/html/mrtg/devicename/index.html /etc/mrtg/devicename.cfg
env LANG=C /usr/bin/mrtg /etc/mrtg/devicename.cfg
- crontab entry
0-59/5 * * * * env LANG=C /usr/bin/mrtg /etc/mrtg/devicename.cfg
4. How to view .pcap files
tcpdump -ttttnnr tcp_dump.pcap
date -s "04/20/2010 14:22:00"
2. enable logging on Cisco firewall
logging on
logging timestamp
logging monitor debugging
logging trap informational
logging history critical
logging facility 23
logging device-id ipaddress inside
logging host inside 10.50.8.112
3. MRTG
mkdir /var/www/html/mrtg/devicename
/usr/bin/cfgmaker --global WorkDir:/var/www/html/mrtg/devicename
indexmaker --output=/var/www/html/mrtg/devicename
env LANG=C /usr/bin/mrtg /etc/mrtg/devicename
- crontab entry
0-59/5 * * * * env LANG=C /usr/bin/mrtg /etc/mrtg/devicename.cfg
4. How to view .pcap files
tcpdump -ttttnnr tcp_dump.pcap
20100329
Intel processor - Qual core, core 2 duo, core 2 quad information
Cores/threads
Cores and threads go hand in hand. Multi-core processors are single chips that contain two or more distinct processors or execution cores in the same integrated circuit. Multi-threading allows each core to work on two tasks at once, thereby letting you do more things simultaneously, producing faster, more efficient results. Now your computer can keep up with even your heaviest multitasking.
As per this understanding, Core 2 Duo will have dual processor with capabale of running 2 X 2 threads
Dual core processor will have dual processor with capable of running 1 X 2 threads
Intel® Smart Cache
Cache is a fast storage area where the processor places frequently accessed data. Smart Cache is Intel’s performance-maximized data storage. It allows each processor core to dynamically utilize up to 100% of available cache and obtain data from the cache at higher throughput rates. By keeping more data closer to the processor for fast execution, overall performance is improved. This is of particular benefit when running rich media titles and games, as well as everyday productivity applications.
Intel Tubo Boost Technology
Available on select models of the all new 2010 Intel® Core™ processor family, Intel® Turbo Boost Technology dynamically redirects power and accelerates performance to match your workload. Previously, unused portions of the chip would be “turned off,” leaving some cores idle. Intel® Turbo Boost Technology reroutes that unused performance to the cores that are active, boosting their performance without wasting power. As a result, you automatically get extra performance whenever you need it, and increased energy efficiency when you don’t.
Intel® Hyper-Threading Technology
Available on all new 2010 Intel® Core™ processor family, Intel® Hyper-Threading Technology delivers more efficient use of processor resources and improved performance on multithreaded software. This allows you to run demanding desktop applications simultaneously while maintaining system responsiveness. For example, Intel® Hyper-Threading Technology helps multimedia enthusiasts create, edit and encode graphically intensive files while running background applications, such as virus protection software, without compromise to performance.
http://www.intel.com/technology/product/demos/multi/demo.htm?iid=tech_multi-core+body_demo
Running applications simultaneously which are of nature:
-- Multiple threaded applications
-- Multiple applications
Intels HT technology enables two threads to be processed in a single processor, allowing parallel partial execution. Ex. thread1 and thead2 are processed in a single processor simultaneously and output are provided simultaneously. This requries HT enabled chipset.
Dual core processors enable two threads to be fully processed in parallel in their own processor cores. Similarly Quad core allows four threads to be processed in parallel simultaneously.
HT on multicore processors allows twice as many threads to be processed in parallel.
Cores and threads go hand in hand. Multi-core processors are single chips that contain two or more distinct processors or execution cores in the same integrated circuit. Multi-threading allows each core to work on two tasks at once, thereby letting you do more things simultaneously, producing faster, more efficient results. Now your computer can keep up with even your heaviest multitasking.
As per this understanding, Core 2 Duo will have dual processor with capabale of running 2 X 2 threads
Dual core processor will have dual processor with capable of running 1 X 2 threads
Intel® Smart Cache
Cache is a fast storage area where the processor places frequently accessed data. Smart Cache is Intel’s performance-maximized data storage. It allows each processor core to dynamically utilize up to 100% of available cache and obtain data from the cache at higher throughput rates. By keeping more data closer to the processor for fast execution, overall performance is improved. This is of particular benefit when running rich media titles and games, as well as everyday productivity applications.
Intel Tubo Boost Technology
Available on select models of the all new 2010 Intel® Core™ processor family, Intel® Turbo Boost Technology dynamically redirects power and accelerates performance to match your workload. Previously, unused portions of the chip would be “turned off,” leaving some cores idle. Intel® Turbo Boost Technology reroutes that unused performance to the cores that are active, boosting their performance without wasting power. As a result, you automatically get extra performance whenever you need it, and increased energy efficiency when you don’t.
Intel® Hyper-Threading Technology
Available on all new 2010 Intel® Core™ processor family, Intel® Hyper-Threading Technology delivers more efficient use of processor resources and improved performance on multithreaded software. This allows you to run demanding desktop applications simultaneously while maintaining system responsiveness. For example, Intel® Hyper-Threading Technology helps multimedia enthusiasts create, edit and encode graphically intensive files while running background applications, such as virus protection software, without compromise to performance.
http://www.intel.com/technology/product/demos/multi/demo.htm?iid=tech_multi-core+body_demo
Running applications simultaneously which are of nature:
-- Multiple threaded applications
-- Multiple applications
Intels HT technology enables two threads to be processed in a single processor, allowing parallel partial execution. Ex. thread1 and thead2 are processed in a single processor simultaneously and output are provided simultaneously. This requries HT enabled chipset.
Dual core processors enable two threads to be fully processed in parallel in their own processor cores. Similarly Quad core allows four threads to be processed in parallel simultaneously.
HT on multicore processors allows twice as many threads to be processed in parallel.
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