Poor application performance when using XFS filesystem on HP Gen8 systems
Issue
- performance was ok on HP Gen7 (Smart Array P410) servers using xfs filesystem with application load
xfs_info data = bsize=4096 blocks=89128960, imaxpct=25 = sunit=0 swidth=0 blks
- poor performance observed on HP Gen8 (Smart Array P420) servers with xfs filesystem and same application load
xfs_info data = bsize=4096 blocks=89128960, imaxpct=25 = sunit=64 swidth=192 blks
- measured iostats show 10x increase in amount of data sent to storage for same application script:
totals read kb write kb avgrq-sz rkb/s wkb/s Gen7 120,942 860,063 18 602 4,300 Gen8 482,576 11,948,034 181 2,412 59,740
Environment
- Red Hat Enterprise Linux 6.4 (2.6.32-358.2.1.el6 20-Feb-2013)
- xfsprogs-3.1.1-7.el6
- random writes present from application
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