On Sat, Sep 01, 2007 at 12:16:00PM +1000, Alex Samad wrote: > raid 1 / > raid 1 /boot > raid 5 - pv > > I have been looking at why not to raid 5 and I would go to raid 10 but I can > only put 3 drives in my machine. > > Currently have 3x250G and am looking at getting 3x500G, if I go to mdadm > raid1, > then I have 500G safe 500G unsafe which is not really what I want. > > I am going to stick with the /, /boot raid1 sets. > > But I was thinking about setting up the rest of the space as pv's and them > using lvm's dm-mirror to manage the mirroring of space ? then if I don't > want > any redundancy on my space I can lvcreate without dm-mirror. > > Any one doing this, I haven't had much experience with dm-mirror. > my thoughts were > > 1 big vgroup > and lots of lv's some with mirrors and some without ?
I don't see a mirror option in Etch's LV create. Here's how I would do it: Partition 1: 3-way raid1 64 MB for /boot Partition 2: 3-way raid1 300 MB for / Partition 3: 1/2 of remainder on each drive Partition 4: the other 1/2 of remainder. Drives are a,b, and c. md0: a1, b1, c1 >> raid1 /boot md1: a2, b2, c2 >> raid1 / md2: a3, b4 >> raid1, as PV for LVM md3: b3, c4 >> raid1, as PV for LVM md4: c1, a4 >> raid1, as PV for LVM This way, you can still loose one drive and be safe. It gives you 750 GB safe, 0 unsafe. Of course, performance won't be as good as if you had 4 drives so that you didn't have more than one busy md per drive, but this is a good compromise. Why is it that you can't fit in a 4th drive? Are there only 3 bays? What about an external bay that operates at SATA speeds; look at addonics. Doug. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]