Hello Valdis, Friday, March 4, 2005, 8:55:52 AM, you wrote:
> IBM's AIX 4.3 and later support LZ compression on their JFS file system. > I was able to measure a 10-15% speed-up by converting /usr to compressed > even on a 133MZ Power604e chip because even back then, it was faster to > read half as many blocks off a SCSI disk and decompress. Interesting. > So it's been at least a potential win for a decade or so, assuming your > filesystem is able to deal well with fragments (you can't really win unless > you take a 4K or so logical block, compress it to some number of 512-byte > chunks, and then store the resulting chunks cheaply - JFS does the > blocks-and-frags efficiently, so it's easy to win. I wonder if NTFS compression does it well... I was always scared of compression on NTFS because of possible slowdowns and just the fact that compression adds another level of complexity to all reads/write and possible future recovery if something breaks down. -- Best regards, Maciej
