Richard Tector wrote: > I'm suffering from very slow write performance on a Dell PowerEdge 860 > with the SAS5/IR controller (mpt driver) running either 6.2-RELEASE or > 6.2-STABLE with sources from yesterday. The controller hosts 2 Western > Digital 320GB SATA disks in a RAID1 configuration. > Reads approach 65MB/s however writes appear extremely slow, in the > region of 6-7MB/s with a dd and a blocksize of 1MB all the way down to > about 300KB/s while extracting a ports snapshot. > > It was suggested to me that perhaps write caching has been disabled on > the controller however no options exist within the BIOS configuration to > view/adjust *any* caching options.
You looked in the controller's BIOS, not motherboard's, right? There should be at least a "write through" vs "write back" switch... If you don't have a battery for the SAS controller, get one. > Has anyone else experienced this issue? No, but can you post the relevant bits for the controller from dmesg?
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