Quoting Eran Tromer, from the post of Wed, 06 Apr: > > RAID1 you double the amount of writes, whereas in RAID0 you balance the > > number of reads and writes between more than one disk, > > files stored far apart on the (logical) disk. In RAID1 there are two > copies of the data, each with an independent disk head assembly, so > (with a good implementation) you'll end up having one disk serving the > first file and the second serving the second file, and each will only do
well, in that case why not do a mirror group of 3 drives as well? :-) In certain cases, as you mention, it will indeed be faster, the give-and-take of slow writes against fast reads is what people should check for usefulness with their application. as for whether the linux kernel balances reads between disks - compare the following: http://jenna.scso.com/hotsanic/diskio/sda.html http://jenna.scso.com/hotsanic/diskio/sdb.html the numbers for reads are sort of close, but the writes are quite different. I can't explain that. -- The tragically hip Ira Abramov http://ira.abramov.org/email/ ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
