Raid performance problems (pdflush / raid5 eats 100%)

2007-10-02 Thread Goswin von Brederlow
Hi, we (Q-Leap networks) are in the process of setting up a high speed storage cluster and we are having some problems getting proper performance. Our test system consists of a 2x dual core system with 2 dual channel UW scsi controlers connected to 2 external raid boxes and we use iozone with

Re: Raid performance problems (pdflush / raid5 eats 100%)

2007-10-02 Thread Justin Piszcz
On Tue, 2 Oct 2007, Goswin von Brederlow wrote: Hi, we (Q-Leap networks) are in the process of setting up a high speed storage cluster and we are having some problems getting proper performance. Our test system consists of a 2x dual core system with 2 dual channel UW scsi controlers

Re: Raid performance problems (pdflush / raid5 eats 100%)

2007-10-02 Thread Goswin von Brederlow
Justin Piszcz [EMAIL PROTECTED] writes: Have you tried a 1024k stripe and 16384k stripe_cache_size? I'd be curious what kind of performance/write speed you get with that configuration. Justin. stripe_cache_size is not in KiB of memory but in multiples of some internal structures. So 16384