Ivan Voras wrote: > Most of new hardware RAID controllers offer stripe sizes of 128K, 256K > and some also have 512K and 1M stripes. In the simplest case of RAID0 of > two drives, knowing that the data is striped across the drives and that > FreeBSD issues IO request of at most 64K, is it useful to set stripe > sizes to anything larger than 32K? I suppose something like TCQ would > help the situation but does anyone know how is this situation usually > handled on the RAID controllers? Short answer: yes. Larger stripe sizes would allow better performance for continuous read/write. In theory they will negatively affect small size read/write but in practice you will notice that larger stripe size would give better performance in almost all cases. -- Xin LI <delphij_at_delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve!Received on Mon Mar 31 2008 - 16:55:52 UTC
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