Chris Stark writes:
I have a LSI MegaRAID i4 running in RAID 5 mode with 4 x 120 GB ATA drives as my "/home" partition. The write performance is deplorably bad (5 MB/s) but what's worse is that the system load shoots up to 15.0 or even higher when I transfer any file that takes longer than a couple of seconds. The system has quite a bit running on it (usually around 100 processes), but the load normally averages around 0.02 - 0.8 (when not transerferring files).
Try adding elevator=deadline to your kernel line in /etc/grub.conf and reboot.
This certainly helped. The transfer speed is up a little (~ 7 MB/s) and the system load is down to ~ 5.75. This is a marked improvement, but the load still seems a bit high and the write speed a bit low.
Is it just that this card is crap?
About a year ago I tried getting a Megaraid card working. The retail box proudly listed its supposed Linux compatibility.
I admit that the problem's ultimate cause were probably rooted in driver bugs in an early FC kernel.
But, after receiving utterly inexcusable goober replies from Megaraid's tech support mailbox, I just wrote them off as a lost cause.
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