On 30 January 2011 12:15, Roman Mamedov <rm@xxxxxxxxxx> wrote: > On Sun, 30 Jan 2011 12:09:02 +0000 > Mathias BurÃn <mathias.buren@xxxxxxxxx> wrote: > >> Right, it's just that I don't want to destroy my data. I've ran a few >> bonnie++ benchmarks with different mount options though. You can find >> them here: http://stuff.dyndns.org/logs/bonnie_results.html >> It actually looks like stripe=384 helped performance a bit. Currently >> retrying the same mount options but with 32MB stripe cache instead of >> 8MB. > > Be aware that it's not just 32MB of RAM, it's > > Â"stripe_cache_size * 4096 (page size) * number of disks". > > In other words on 6 disks this stripe cache will consume 768 MB of RAM. > > -- > With respect, > Roman > Thanks. New results up for those interested: http://stuff.dyndns.org/logs/bonnie_results.html It looks like the best performance (for me) is gained using rw,noatime,nouser_xattr,data=writeback,stripe=384 , 8192 stripe_cache_size, NCQ turned on (31), md0 readahead of 65536. I did switch place between the SSD and a HDD so there's only 2 HDDs on the PCI-E controller now, that are part of the RAID. The other 4 are on the internal SATA controller. csv format: "Host","Chunk size","Sequential Output",,,,,,"Sequential Input",,,,"Random Seeks",,"Files","Sequential Create",,,,,,"Random Create",,,,,,"Mount options","stripe_cache_size","NCQ","md0 readahead","Comment" ,,"Per Chr",,"Block",,"Rewrite",,"Per Chr",,"Block",,"Seeks",,,"Create",,"Read",,"Delete",,"Create",,"Read",,"Delete",,,,,, ,,"K/sec","CPU","K/sec","CPU","K/sec","CPU","K/sec","CPU","K/sec","CPU","/sec","CPU",,"/sec","CPU","/sec","CPU","/sec","CPU","/sec","CPU","/sec","CPU","/sec","CPU",,,,, "ion","7G",13916,98,158905,91,71718,39,14539,99,295079,57,482.8,3,16,20747,99,"+++++","+++",24077,93,21249,99,"+++++","+++",25854,99,"rw,noatime,nouser_xattr,data=writeback,stripe=384",8192,31,65536,"4 on host 2 on pci-e" A bit messy. I did find another PCI-E SATA controller that is generation 2.0, and looks like it may do the trick. This one: http://www.newegg.com/Product/Product.aspx?Item=N82E16816115053 "HighPoint RocketRAID 2640x1 PCI-Express x1 Four-Port SATA and SAS RAID Controller Card". It's ~â110 on eBay, a bit hefty. I might just save up and build a NAS box from scratch, with some mainboard which has 8 SATA from the start etc. // Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
