Messages in this thread | | | Date | Fri, 27 May 2005 18:12:17 +0200 | From | Tobias Reinhard <> | Subject | Problem with concurrent SATA-Writes |
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Hi All!
I have a problem with two SATA-Discs. I have an onboard SIL3114 with four SATA-Ports an onboard NVIDIA with two SATA-Ports - both controllers are disable via BIOS (and are not detected by Linux)(only for this test of course - normally I have other HDD on this ports). The only controller that is found is the add-on controller in a PCI-Slot (SIL3112). And that is the one I have trouble with.
If I read or write (via dd) from the first one -> no problems. Same when read or write from the second or when I read (only read!) from both at the same time. Data-Transfer-Rate is around 45MB/s for one HDD.
The problem occures when I try to write on both discs at the same time. For example I write /dev/zero to the first one and then start to write /dev/zero to the second one. The System-Load goes up to 4 with nearly 100% io-wait and nearly no really write-access to the drives.
Any hints?
- no errormessages in syslog - happens with Kernel 2.6.11.7 and with 2.6.12-rc5 - HDDs are Samsung Spinpoint 200GB - (I use the SCSI-SATA-Drivers) - anything else you need?
Thanks
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