vxfs fragmentation..

 
Russ Hancock_1
Frequent Advisor

vxfs fragmentation..

We've been having a number of issues for Netbackup on our rp5470, network timeouts is the failure message after files to tape for hours on end...
Anyway, in the past Veritas have pointed at fragmentation of the drive as an issue. Could someone tell me if the following report shows a fragmented drive ? please.

And I guess the next question: should defrag be run on a running oracle instance?!

Thanks
Russ


Directory Fragmentation Report
Dirs Total Immed Immeds Dirs to Blocks to
Searched Blocks Dirs to Add Reduce Reduce
total 4012 11804 2550 3 142 1121

Extent Fragmentation Report
Total Average Average Total
Files File Blks # Extents Free Blks
1826288 26 1 14943153
blocks used for indirects: 1664
% Free blocks in extents smaller than 64 blks: 4.32
% Free blocks in extents smaller than 8 blks: 2.52
% blks allocated to extents 64 blks or larger: 81.14
Free Extents By Size
1: 103241 2: 83462 4: 26539
8: 13152 16: 5467 32: 2384
64: 1320 128: 1024 256: 457
512: 156 1024: 84 2048: 8
4096: 1 8192: 2 16384: 0
32768: 0 65536: 0 131072: 1
262144: 0 524288: 0 1048576: 1
2097152: 0 4194304: 1 8388608: 1
16777216: 0 33554432: 0 67108864: 0
134217728: 0 268435456: 0 536870912: 0
1073741824: 0 2147483648: 0

Russ
1 REPLY 1
likid0
Honored Contributor

Re: vxfs fragmentation..

Here are some things to look at:

There are three factors which can be used to determine the
degree of fragmentation:
â ¢ Percentage of free space in extents of less than eight blocks in length
â ¢ Percentage of free space in extents of less than 64 blocks in length
â ¢ Percentage of free space in extents of length 64 blocks or greater
An unfragmented file system will have the following characteristics:
â ¢ Less than 1 percent of free space in extents of less than eight blocks in length
â ¢ Less than 5 percent of free space in extents of less than 64 blocks in length
â ¢ More than 5 percent of the total file system size available as free extents in lengths of 64
or more blocks

A badly fragmented file system will have one or more of the following characteristics:
â ¢ Greater than 5 percent of free space in extents of less than 8 blocks in length
â ¢ More than 50 percent of free space in extents of less than 64 blocks in length
â ¢ Less than 5 percent of the total file system size available as free extents in lengths of 64 or


So as you can see your file system is not badly fraged, but it could do with some defraging.

You can defrag online with no problems, BUT i would recomend doing it, on a mantainance window(at night), because it gives io and cpu a good work out.
Windows?, no thanks