John R Pierce wrote: > Stewart Williams wrote: >> John R Pierce wrote: >> >>> Stewart Williams wrote: >>> >>>> The block I/O is the thing that concerns me as mostly I am serving a >>>> 650MB file via samba to 5 clients and I think this is where I need the >>>> speed. >>>> >>> is this a sequential or random access application thats using this >>> file? is it read only/mostly, or is it random update? >>> >> I'm not sure, how can I find this out? >> > > well, what is the nature of the application thats using this file? > do you really mean just a single 650MB (sub 1GB) file? > is this something like a quickbooks file? (thats kind of what it sounds > like from your other answers). It is indeed a quickbooks file. The file is currently at 645MB and grows about 20MB per week. > given what you have now, and what information we've been given, I would > > A) disable BIOS raid, configuring it for JBOD w/ ACHI enabled > B) mdadm mirror disks 0 and 1, and put the OS on that > C) mdadm mirror disks 2 and 3, and put your shared SMB filesystem on > that Is that a better choice than RAID 1+0?