Hello All, I have an issue with fragmentation on a particular device thanks for any advice.
-Brady I have a Dell r510 with 12 disks 2xraid 5 (6 disks each) raid group1: 48 GB carved out for os mounted as / remaining space 2.7 TB for xfs mounted as /data1 raid group2: 48 GB for swap remaining space 2.7 TB for xfs mounted as /data2 The strange thing is that /data1 never gets fragmented where as /data2 is badly fragmented. I believe increase allocsize would help, but not sure how to explain why /data2(/dev/sdd) always gets fragmented and not /data1(/dev/sdb) This is on RHEL 5.5 kernel 2.6.18-194.11.1.el5 It's a data warehouse application. the I/O is balanced between /data1 and /data2: output of xfs_db [r...@sdw4 data1]# xfs_db -c frag -r /dev/sdb actual 14353, ideal 13702, fragmentation factor 4.54% [r...@sdw4 data1]# xfs_db -c frag -r /dev/sdd actual 408674, ideal 13719, fragmentation factor 96.64% df output /dev/sdb 2.7T 967G 1.8T 36% /data1 /dev/sdd 2.7T 1.1T 1.7T 39% /data2 LABEL=/data1 /data1 xfs allocsize=1048576,logbufs=8,noatime,nodiratime 0 0 LABEL=/data2 /data2 xfs allocsize=1048576,logbufs=8,noatime,nodiratime 0 0 raid config output: [r...@sdw4 data1]# omreport storage vdisk List of Virtual Disks in the System Controller PERC H700 Integrated (Slot 4) ID : 0 Status : Ok Name : boot State : Ready Hot Spare Policy violated : Not Assigned Virtual Disk Bad Blocks : No Secured : Not Applicable Progress : Not Applicable Layout : RAID-5 Size : 48.99 GB (52602470400 bytes) Device Name : /dev/sda Bus Protocol : SAS Media : HDD Read Policy : No Read Ahead Write Policy : Force Write Back Cache Policy : Not Applicable Stripe Element Size : 128 KB Disk Cache Policy : Disabled ID : 1 Status : Ok Name : data1 State : Ready Hot Spare Policy violated : Not Assigned Virtual Disk Bad Blocks : No Secured : Not Applicable Progress : Not Applicable Layout : RAID-5 Size : 2,742.89 GB (2945150484480 bytes) Device Name : /dev/sdb Bus Protocol : SAS Media : HDD Read Policy : No Read Ahead Write Policy : Force Write Back Cache Policy : Not Applicable Stripe Element Size : 128 KB Disk Cache Policy : Disabled ID : 2 Status : Ok Name : swap State : Ready Hot Spare Policy violated : Not Assigned Virtual Disk Bad Blocks : No Secured : Not Applicable Progress : Not Applicable Layout : RAID-5 Size : 48.99 GB (52602470400 bytes) Device Name : /dev/sdc Bus Protocol : SAS Media : HDD Read Policy : No Read Ahead Write Policy : Force Write Back Cache Policy : Not Applicable Stripe Element Size : 128 KB Disk Cache Policy : Disabled ID : 3 Status : Ok Name : data2 State : Ready Hot Spare Policy violated : Not Assigned Virtual Disk Bad Blocks : No Secured : Not Applicable Progress : Not Applicable Layout : RAID-5 Size : 2,742.89 GB (2945150484480 bytes) Device Name : /dev/sdd Bus Protocol : SAS Media : HDD Read Policy : No Read Ahead Write Policy : Force Write Back Cache Policy : Not Applicable Stripe Element Size : 128 KB Disk Cache Policy : Disabled
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