Feizhou spake the following on 1/31/2007 7:09 AM: > Jerry Geis wrote: >> Is there any performance lost in using a software raid array >> with only 1 disk? >> >> I was wanting to use the mdadm monitoring tools to monitor the >> machines single disk drive for failures and such. Is there any >> performance hit for such a setup? > > I assume you are talking about RAID1 arrays. No, you won't. Rather, you > will get a performance loss if you carve up your disk into more than one > partition. > >> >> Some machines have RAID some machines dont (for me) and >> I was thinking about a common setup. >> >> Also then if I want in the future I can actually just add the second >> disk and now I have RAID. > > I don't think you can actually build an array with missing disks. Yes, you can build an array with missing disks, and you shouldn't see much write difference with a missing drive in raid1, but might see a lower read performance (lower than having the raid array, but near equal to a single non-raid drive). With software raid5, you usually see some degradation with both write and read. -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!!