Date: Wed, 17 Jun 2009 13:35:52 +0200 From: =?windows-1252?Q?Matej_=8Aerc?= <matej.serc@gmail.com> To: freebsd-questions@freebsd.org Subject: Very slow disk speed / mpt0: LSILogic SAS/SATA Adapter Message-ID: <497fe93d0906170435l5a3a18ccw2159d99443055122@mail.gmail.com>
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Hi, we have a HP ProLiant server with RAID 0/1 controller onboard. It is detected as mpt0 (I have attached a part of dmesg output at the end of the mail). As reported by some already ( http://www.mail-archive.com/freebsd-performance@freebsd.org/msg02446.html), we are also getting extremely slow write speeds. I read somewhere that there are some improvements which could solve the situation in 7.2 (our system has 7.1 installed and I am currently unable to turn it off and it will stay so for at least 3 months). There are some information that setting hw.mpt.enable_sata_wc=1 solves the write speed (it actually does as I tested!), but I would like to know more about how danger that option is. We are using softupdates and now have this hw.mpt.enable_sata_wc=0, after reading that it might be very dangerous when using sata_wc=1. I am really looking forward to getting more information about this, it is actually driving me nuts. We have a number of other servers and there are no problems with RAID controllers at all. And as I said, I cannot actually turn of this machine and bring it back to reinstall new OS. Thank you very much for your comments and thoughts, Matej The server model is ML110G5. mpt0: <LSILogic SAS/SATA Adapter> port 0xd000-0xd0ff mem 0xfcefc000-0xfcefffff,0xfcee0000-0xfceeffff irq 16 at device 0.0 on pci5 mpt0: [ITHREAD] mpt0: MPI Version=1.5.16.0 mpt0: Capabilities: ( RAID-0 RAID-1E RAID-1 ) mpt0: 1 Active Volume (2 Max) mpt0: 3 Hidden Drive Members (10 Max)
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