Benjamin Franz wrote: > Robert Heller wrote: >> I suspect that this is a simular case to what I did: I have a server >> with 4 drives. I have several (small) RAID1 partitions (/boot, /, >> /usr, /var, etc.) with 4 mirrors and one large RAID5 with three >> partitions and a hot spare (a LVM volumn group, containing /home and >> some other partitions). I would guess that the admin with the "8-way >> RAID1 for the OS" probably also has a 6 or 8 disk RAID5 or RAID6 for >> the bulk of the disks > Yup. 8 way RAID1 for the OS, 8 way RAID6 for the data. I was hoping when > I setup the 8-way RAID1 for the OS that I would get really good read > speeds since md is supposed to stripe reads from RAID1, but in practice > the RAID6 completely kills it for read performance (~61 MB/sec from the > RAID1 partition vs ~200 MB/sec from the RAID6 partition). What are you running? I think there was a patch that evened out the reads across all members as it would at times solely read from one and then another...