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Re: SATA write performance problems (on HP MicroServer) (Edgar =?iso-8859-1?B?RnXf?=) writes:

>I have performance problems writing to the SATA discs on my HP MicroServer.
>In the BIOS, IDE is switched to AHCI. The discs do NOT have 4k sectors.
>I can read more than 70MB/s.

>I can write 110 to 120 transfers per second regardless of block size.
>With 64k blocks, that's 6.7MB/s. If I use 32k blocks, it's 3.6MB/s, on 16k 
>blocks 1.9MB/s and so on.
>I ruled out alignment problems by moving the test partition, one block at a 
>time, seven times. No difference.

Does your drive have write-caching disabled? You can enable it with 'dkctl wd0 
setcache rw'.

                                Michael van Elst
                                "A potential Snark may lurk in every tree."

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