Thank you very much. I'll need to go back and reread this and digest it some more. I hadn't thought of doing multiple RAID types on the drives. I have two and did RAID1 for /boot and was going to RAID1 the rest. However, I really want RAID0 for speed and capacity on some file systems. The swap comment is interesting, too. I have two small partitons for swap - one on each drive and I was going to parallel them per one of DRobbins articles.
> > From: "Boyd Stephen Smith Jr." <[EMAIL PROTECTED]> > Date: 2006/02/20 Mon PM 01:30:59 EST > To: gentoo-user@lists.gentoo.org > Subject: Re: [gentoo-user] raid/partition question > > On Monday 20 February 2006 11:51, [EMAIL PROTECTED] wrote about > 'Re: Re: [gentoo-user] raid/partition question': > > As an extension of this question since I'm working on setting up a > > system now. > > > > 3. Neither. See below. First a discussion of the two options. > > 1. Is fine, but it forces you to choose a single raid level for all your > data. I like raid 0 for filesystems that are used a lot, but can easily > be reconstructed given time (/usr) and especially filesystems that don't > need to be reconstructed (/var/tmp), raid 5 or 6 for large filesystems > that I don't want to lose (/home, particularly), and raid 1 for critical, > but small, filesystems (/boot, maybe). > > 2. Is a little silly, since LVM is designed so that you can treat multiple > pvs as a single pool of data OR you can allocate from a certain pv -- > whatever suits the task at hand. So, it rarely makes sense to have > multiple volume groups; you'd only do this when you want a fault-tolerant > "air-gap" between two filesystems. > > Failure of a single pv in a vg will require some damage control, maybe a > little, maybe a lot, but having production encounter any problems just > because development had a disk go bad is unacceptable is many > environments. So, you have a strong argument for separate vgs there. > > 3. My approach: While I don't use EVMS (the LVM tools are fine with me, at > least for now) I have a software raid 0 and a hw raid 5 as separate pvs in > a single vg. I create and expand lvs on the pv that suits the data. I > also have a separate (not under lvm) hw raid 0 for swap and hw raid 6 for > boot. I may migrate my swap to LVM in the near future; during my initial > setup, I feared it was unsafe. Recent experience tells me that's (most > likely) not the case. > > For the uninitiated, you can specify the pv to place lv data on like so: > lvcreate -L <size> -n <name> <vg> <pv> > lvresize -L <size> <vg>/<lv> <pv> > The second command only affect where new extents are allocated, it will not > move old extents; use pvmove for that. > > -- > Boyd Stephen Smith Jr. > [EMAIL PROTECTED] > ICQ: 514984 YM/AIM: DaTwinkDaddy > -- > gentoo-user@gentoo.org mailing list > > -- gentoo-user@gentoo.org mailing list
