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>Unfortunately, journaling uses a chunk of space. Imagine a journal on a >USB flash stick of 128M; a typical ReiserFS journal is 32 megabytes! >Sure it could be done in 8 or 4 or so; or (in one of my file system >designs) a static 16KiB block could reference dynamicly allocated >journal space, allowing the system to sacrifice performance and shrink >the journal when more space is needed. Either way, slow media like >floppies will suffer, HARD; and flash devices will see a lot of >write/erase all over the journal area, causing wear on that spot. - Smallest reiserfs3 journal size is 513 blocks - some 2 megabytes, which would be ok with me for a 128meg drive. Most of the time you need vfat anyway for your flashstick to make useful use of it on Windows. - reiser4's journal is even smaller than reiser3's with a new fresh filesystem - same goes for jfs and xfs (below 1 megabyte IIRC) - I would not use a journalling filesystem at all on media that degrades faster as harddisks (flash drives, CD-RWs/DVD-RWs/RAMs). There are specially-crafted filesystems for that, mostly jffs and udf. - You really need a hell of a power fluctuation to get a disk crippled. Just powering off (and potentially on after a few milliseconds) did (in my cases) just stop a disk write whereever it happened to be, and that seemed easily correctable. Jan Engelhardt -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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