Hi all, Pardon if this isn't the best place to post this email...maybe it belongs on the lucene-user list . Also, it's basically windows-specific,so not of use to everyone...
The question: does NTFS fragmentation affect search performance "a little bit" or "a lot"? It's obvious that "fragmentation will slow things down", but is it a factor of .1, 10 , or 100? (i.e what order of magnitude)? As a follow up: should solr/lucene users periodically remind Windows sysadmins to defrag their drives ? On a production system, I ran the windows defrag "analyzer" and found heavy fragmentation on the lucene index. 11,839 492 MB \data\index\search\_6io5.cfs 7,153 433 MB \data\index\search\_5ld6.cfs 6,953 661 MB \data\index\search\_8jvj.cfs 5,824 74 MB \data\index\search\_5ld7.frq 5,691 356 MB \data\index\search\_9eev.fdt 5,638 352 MB \data\index\search\_8mqi.fdt 5,629 352 MB \data\index\search\_8jvj.fdt 5,609 351 MB \data\index\search\_88z8.fdt 5,590 355 MB \data\index\search\_96l5.fdt 5,568 354 MB \data\index\search\_8zjn.fdt 5,471 342 MB \data\index\search\_5wgo.fdt 5,466 342 MB \data\index\search\_5uo1.fdt 5,450 340 MB \data\index\search\_5hrn.fdt 5,429 345 MB \data\index\search\_6nyy.fdt 5,371 353 MB \data\index\search\_8sob.fdt Incidentally, we periodically experience some *very* slow searches. Out of curiousity, I checked for file fragmentation (using 'analyze' mode of the nfts defragger) nota bene: Windows sysinternals has a utility "Contig.exe" whic allows you to defragment individual drives/directories. We'll use that to defragmeent the index direcotires will
