Hey all, Here is the summary of what the group's opinion is: UFS vs VxFS UFS VXFS UFS is a derivative of the Berkeley fast filesystem and is allocated in cylinder groups. Clusters of data are grouped together in blocks using pointers of indirection called inodes. The allocation is random based on free space availability. VxFS is an extent based, logging filesystem. Files are allocated as one or more adjacent blocks on disk. The larger the file, the bigger the advantage to this because the entire file can be allocated contiguously (assuming there is space available) which makes for very fast access on read. VxFS is typically faster in real usage and faster during a crash recovery. VxFS requires periodic defragmentation (depending on frequency and type of usage). Can be grown on the fly Can be grown as well as shrunk on the fly Logging can be enabled on the UFS Intent logging minimizes system downtime after abnormal shutdowns by logging filesystem transactions. Intent logging is a circular logging scheme that records pending changes to the filesystem structure. sync-on-close option not available Sync-on-close option available(i.e. the data is flushed on the disk as soon as file is closed) Disk space overhead for inodes Uses vector algorithm to keep the starting block number & number of blocks allocated thus no need of tracking each block allocation. Fragmentation overheads are minimal Fragmentation overhead are quite high. In the newest version a better algorithm minimizes the same Only one logging option Multiple logging options. You can choose them to suit your system/application availability. If you don't have to spend then use UFS with logging. But VxFS is quite flexible & better overall as compared to UFS. Regards Himanshu Get Your Private, Free E-mail from Indiatimes at http://email.indiatimes.com Buy the best in Movies at http://www.videos.indiatimes.com Bid for Air Tickets @ Re.1 on Air Sahara Flights. Just log on to http://airsahara.indiatimes.com and Bid Now ! _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagersReceived on Sat Feb 15 06:12:32 2003
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