Forgot to cc linux-raid... keld On Fri, Aug 07, 2009 at 07:34:23PM +0200, Keld Jørn Simonsen wrote: > On Fri, Aug 07, 2009 at 12:52:34PM -0400, Harold Pritchett wrote: > > Keld Jørn Simonsen wrote: > > > >> It is a good idea to have a how-to. But there are already a few around. > >> I wrote something like it for our wiki at > >> http://linux-raid.osdl.org/index.php/Preventing_against_a_failing_disk > >> but with some more advanced features, such as you do not crash if one > >> disk fails, and you can reboot the system without a rescue disk, and you > >> get faster mirrored raid, avoiding the slow raid 1. It does not do LVM, > >> however, and I think that how-to should be enhanced with LVM. > > > > I guess this would depend upon the linux. Currently, I am working with > > Centos 5.3 and the only raid personalities available in the kernel on > > the DVD appear to be RAID0, RAID1, RAID5, and RAID6. With two disks > > this limits us to RAID0 and RAID1. > > I am also running centos 5.3 and raid10 is supported, and I run most of > my data on it. > > >>> I'm from the old school. I believe in lots of partitions. Create any > >>> additional partitions you may need. If you really want to, you can > >>> just create a single partition and put "/" in it. You still will > >>> need the "/boot" partition since you can't boot from an LVM partition. > >> > >> I think it is good to have a / , a /home, and possibly a /boot > >> partition, but having more partitions is probably just shooting > >> yourself in the > >> foot, because you may create space problems. Those smaill partitions can > >> easily hit some roof, like /var (when logs run full) and /tmp (doing temporary > >> work like editing in big files), /opt and /usr/local (installing big new packages) > >> and why should /usr and / be on different partition - that beats me. > > > > As I said, I'm from the old school originally cutting my teeth on BSD unix in > > the 1980's. In those days, disks were always too small. A couple of 20 MB > > disks (that's MB, not GB) was a LOT of space back then. By using multiple > > partitions you could keep a run-away from crashing the whole system when it > > filled up /tmp or /var. > > I am also from that time, starting out with UNIX V6 on RL05 with 2.5 MB on a PDP-11/45. > And we had a *big* 40 MB disk in the corner. Later we ran VAX'en and BSD > 4.2 - still I think it is better to keep the system things in one > partition. Anyway why not describe both, and tell of pros and cons. > > > But once again, this personal preferences. All you really need is /boot, / and > > some swap space. > > I agree with that. > > >>> You can now continue to install linux normally. I usually do it twice. > >>> the first time is to get an idea of how big each partition should be > >>> and the second time is to get it right. > >> > >> That is cumbersome, and probably caused by your use of many partitions. > >> It will turn some novices off. > > > > Make the default a single partition and put the multiple partition version in an > > appendix... In today's world of TeraByte disk drives for under $100.00 It may > > be the best idea to just put it all in a single file system. > > as sad you could decribe both. For pedagogical reasons, and because it > does not matter very much, you could probebly benefit from describing > the simpler version. > > >> why can't you boot from the working drive? > >> The system should be configured to do this. > >> > >>> 4. Boot from the linux rescue CD/DVD and start the system, no network. > >> > >> better avoid the rescue cd by making the system bootable from both drives.' > > > > can do... I just didn't think of this... > > > >>> 14. Wait for the mirror to sync. It may take several hours > >> > >> you can begin using the system immediately, while the raids are syncing. > > > > Good point. I knew that and just didn't say it. > > > >> it would be nice if you could reference our wiki, wherever you put up > >> your howto. > > > > I would be glad to... In fact, if we get something useful, you might want > > to put a copy on the wiki... > > to me it is very overlapping with what is already up there. > For now I cannot see the benefit of two howtos with the same aim. > Better consolidate it. > > best regards > keld -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
