Red Hat Bugzilla – Bug 90471
kernel crashes under file i/o load (i.e., bonnie++)
Last modified: 2007-04-18 12:53:35 EDT
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Description of problem:
Client has an application that builds (then deletes) a directory tree (5 layers
deep) with some 85000 directories and about 100 times that number of individual
files. Attached perl script triggers a crash -- eventually, but running
"bonnie++ -s 12g:1k -n 850000:1g:1k:85000" seems to reliably crash the system.
Seems to crash shortly after system needs to page (swap is 2GB). Test is run on
Machine is Dell 2650 w/PERC/3Di; 5 63GB drives in RAID5 config; 6GB RAM; 2 Xeon
CPUs @ 2.2GHz; HT disabled in BIOS.
Crash display not available (damned ACPI).
Version-Release number of selected component (if applicable):
Steps to Reproduce:
2.Apply all updates.
4.run: "bonnie++ -s 12g:1k -n 850000:1g:1k:85000" on default ext3 fs (/home).
Actual Results: Crash -- almost as if "halt" command executed.
Expected Results: test completion
Created attachment 91567 [details]
perl script to cause crash
Ok, after some run-around from Dell, the bottom line is that with intense
filesystem activity (not just blasting i/o), even with the card's cache for the
data partition in write-thru mode (as recommended by Dell), with enough i/o
load, the card will lock up, never to answer to the kernel again -- at least
until a hard reset.