mps(4) driver (LSI 6Gb SAS) commited to stable/8

Dmitry Morozovsky marck at
Fri Feb 18 23:03:24 UTC 2011

On Fri, 18 Feb 2011, Jeremy Chadwick wrote:

JC> > KDM> I just merged the mps(4) driver to stable/8, for those of you with LSI 6Gb
JC> > KDM> SAS hardware.
JC> > 
JC> > [snip]
JC> > 
JC> > Again, thank you very much Ken.  I'm planning to stress test this on 846 case 
JC> > filled with 12 (yet) WD RE4 disks organized as raidz2, and will post the 
JC> > results.
JC> > 
JC> > Any hints to particularly I/O stressing patterns?  Out of my mind, I'm planning 
JC> > multiple parallel -j'ed builds, parallel tars, *SQL benchmarks -- what else 
JC> > could you suppose?
JC> Please be aware of a performance issue affecting certain models of WD
JC> RE4 disks.  Specifics are still sketchy, but you should read the thread
JC> "immense delayed write to file system (ZFS and UFS2), performance
JC> issues" in full to get an idea of the problem:

Well, my disks are (possibly happily ;) not RE4-GP but real RE4 (yellow labels, 
Raid Edition Ready)

But thanks, I'll take additional time to log smartctl data during the 

D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck at ]
*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at ***

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