Flash memory as a hard drive replacement

FLASH MEMORY AS A HARD DRIVE REPLACEMENT Seminar by Hisham Pasha.N.K. Roll No:8 S5 MCA 06/03/11 GEC_Thrissur

OVERVIEW ,[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

HARD DISK STRUCTURE 06/03/11 GEC_Thrissur

STRUCTURE OF A USB FLASH DRIVE 06/03/11 GEC_Thrissur

Applications of flash memory ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

FLASH MEMORY USED IN DEVICES 06/03/11 GEC_Thrissur

FLASH DEGRADATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

FLASH MEMORY V/S HDD ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

Cost is a Key Factor 06/03/11 GEC_Thrissur

Advantages of Flash over HDD ,[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

FLASH AS A HARD DRIVE REPLACEMENT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],C*L*O/W*60*60*24*365 06/03/11 GEC_Thrissur

PROLONGING FLASH LIFE ,[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

1. PROLONGING FLASH LIFE BY REDUCING WRITES ,[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

Mounting Log Files Via NFS ,[object Object],[object Object],<server>:</path/to/dir> /var nfs sync 0 0 06/03/11 GEC_Thrissur

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],<server>:</path/to/dir> /var nfs sync,nofsc 0 0 /path/to/logs/<client host name><client IP>(rw,no_root_squash,no_subtree_check) 06/03/11 GEC_Thrissur

Redirecting Log Output Using Syslog ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

Redirecting Application Logs to Syslog ,[object Object],[object Object],[object Object],CustomLog “|/path/to/logging/script.pl”common 06/03/11 GEC_Thrissur

2.PROLONGING FLASH LIFE BY MOVING /tmp TO tmpfs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

Advantages of tmpfs over Ramdisks ,[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur %mount –t tmpfs –o size=100M,nr_inodes=1k,mode=777 tmpfs /tmp

3. PROLONGING FLASH LIFE BY MANAGING SWAP SPACE ,[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

Analyzing swap space ,[object Object],06/03/11 GEC_Thrissur %free -mt

Running without swap space ,[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur % grep swap /etc/fstab /dev/sda2 swap swap 0 0 % swapoff /dev/sda2 # /dev/sda2 swap swap defaults 0 0

4. PROLONGING FLASH LIFE BY MIGRATING FREQUENTLY WRITTEN FILES OFF FLASH ,[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

5. PROLONGING FLASH LIFE BY TUNING FILE SYSTEMS TO MINIMIZE WRITES ,[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

Standard Linux File System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],06/03/11 GEC_Thrissur

Queries? 06/03/11 GEC_Thrissur

Flash memory as a hard drive replacement

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Flash memory as a hard drive replacement