Re: Element Size - RAID 10 SAN

Hi, Art S. Kagel wrote: > For a 2K > pagesize I like 16 or 32K blocks and I think that would work for 4K & 8K > pagesizes just as well if not better. That's interesting. We're using RAID 1+0 SAN too, informix pagesize 2K and the current stripe size is a whopping 128 KB. How much would decreasing it to 16 or 32 KB theoretically help? Is it worth a try to change it? Thanks, Alex

Aleksander wrote: > Hi, > > Art S. Kagel wrote: > >> For a 2K pagesize I like 16 or 32K blocks and I think that would work >> for 4K & 8K pagesizes just as well if not better. > > > That's interesting. We're using RAID 1+0 SAN too, informix pagesize 2K > and the current stripe size is a whopping 128 KB. How much would > decreasing it to 16 or 32 KB theoretically help? Is it worth a try to > change it? It's certainly worth the time to experiment and test it yourself. Personally, yes IB this will increase throughput under load and release some disk overhead from write operations improving read performance, HOWEVER, I always recommend that you test it out yourself! Every hardware/software/array configuration is different. Art S. Kagel

Aleksander wrote: > Hi, > > Art S. Kagel wrote: > >> For a 2K pagesize I like 16 or 32K blocks and I think that would work >> for 4K & 8K pagesizes just as well if not better. > > > That's interesting. We're using RAID 1+0 SAN too, informix pagesize 2K > and the current stripe size is a whopping 128 KB. How much would > decreasing it to 16 or 32 KB theoretically help? Is it worth a try to > change it? It's certainly worth the time to experiment and test it yourself. Personally, yes IB this will increase throughput under load and release some disk overhead from write operations improving read performance, HOWEVER, I always recommend that you test it out yourself! Every hardware/software/array configuration is different. Art S. Kagel