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Just a think |
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I'm trying lvm, it's great ! |
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We can add remove logical volume, resize them on the fly, and a great |
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think : |
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use power of both disk combinated (strippes) |
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One disk speed for me in read = 45 mo /s |
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Two disk combinated in read = 75 mo /s |
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Have fun |
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Dale a écrit : |
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> Dirk Heinrichs wrote: |
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>> Am Freitag, 17. November 2006 23:30 schrieb ext Dale: |
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>> |
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>> |
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>>> Somewhat on topic here. How hard is it to do this with no previous |
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>>> knowledge of how it works? I am constantly running into the same thing |
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>>> the OP is and having to move things around. Currently I have two 80GB |
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>>> |
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>>> drives. Here is my partition scheme at the moment: |
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>>> |
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>>>> root@smoker / # mount |
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>>>> /dev/hda6 on / type reiserfs (rw) |
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>>>> /dev/hda1 on /boot type reiserfs (rw,noatime,notail) |
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>>>> /dev/hda7 on /home type reiserfs (rw) |
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>>>> /dev/hda8 on /usr type reiserfs (rw) |
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>>>> /dev/hda9 on /usr/portage type reiserfs (rw) |
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>>>> /dev/hda10 on /data type reiserfs (rw) |
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>>>> root@smoker / # |
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>>>> root@smoker / # df |
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>>>> Filesystem 1K-blocks Used Available Use% Mounted on |
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>>>> /dev/hda6 9765136 1896004 7869132 20% / |
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>>>> /dev/hda1 146612 45880 100732 32% /boot |
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>>>> /dev/hda7 9765136 1236144 8528992 13% /home |
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>>>> /dev/hda8 9765136 4269660 5495476 44% /usr |
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>>>> /dev/hda9 5859272 3052004 2807268 53% /usr/portage |
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>>>> /dev/hda10 43762436 10667796 33094640 25% /data |
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>>>> root@smoker / # |
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>>>> |
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>>> Just looking to get a better grasp on this since it sounds like |
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>>> something I need to try. |
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>>> |
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>> |
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>> OK, here's my proposal: First, decide which volume management system to use |
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>> (LVM or EVMS). LVM is just one more volume management tool which you would |
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>> have to learn (beside fdisk, mkfs.*, raid tools, ...), while EVMS does it |
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>> all, and more. Then, do the real work: |
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>> |
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> |
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> Which one is better and good for someone new to this? I'm fairly |
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> descent at Linux. Just thought I would warn you I am not a guru, |
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> yet. ;-) I'm working on it though. |
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>> You mentioned you have two 80G disks, but in the output above I only see one |
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>> in use. If this is really the case, you could start converting to LVM/EVMS |
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>> with the second one (assuming you don't use SW RAID, which I have no |
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>> knowledge of). Emerge LVM or EVMS, depending on your choice, and make sure |
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>> you have CONFIG_BLK_DEV_DM in your kernel. Then either switch to runlevel 1 |
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>> or use a LiveCD to do the real work. |
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>> |
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> |
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> I do have two 80GB drives. One is a Maxtor and one is a Western |
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> Digital. The Maxtor is faster since it has more cache. It is hda and |
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> the one I boot off of. I use the other to back up on before a major |
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> upgrade, like gcc or something that can really screw things up. Even |
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> did it once before a --depclean too. Never needed it but I had it if |
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> I did. I usually boot the Gentoo CD and mount the partitions and just |
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> do a cp -av and let it roll by. I never could master that tar thing |
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> others use. |
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>> 1) Create one big partition on the second disk, with type LVM |
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>> 2) Create a volume group from this partition, choose whatever name you like. |
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>> 3) Create logical volumes inside this volume group, one for each partition |
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>> you have on hda, except /boot and /, create filesystems on them and mount |
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>> them somewhere. From the values above, you still have /var and /opt inside |
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>> hda6. Create new LV's for these two also. |
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>> 4) Copy over the data partitionwise, like: cd /home && tar -clf - .| |
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>> tar -C /mnt/home -xBpvf - |
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>> 5) Change fstab accordingly and check RC_VOLUME_ORDER in /etc/conf.d/rc. |
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>> 6) Rename your old /var and /opt (to /var.save and /opt.save) and recreate |
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>> them as empty directories (you will mount the new LV's there). |
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>> 7) Since you didn't touch /boot and /, you should now be able to boot with |
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>> working LVM/EVMS setup. If this is the case, we can now do some changes on |
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>> hda. |
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>> 8) You will need to boot a LiveCD now, for shrinking hda6 to a reasonable |
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>> amount (256M). |
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>> 9) Create a (temporary) LV, create a filesystem, mount it somewhere and use |
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>> tar as above to copy over / to the new filesystem. |
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>> 10) Repartition hda: Delete all partitions except hda1 (/boot). Create 2 new |
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>> ones, hda2 (/, 256M) and hda3 (rest of the disk, type LVM), make a |
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>> filesystem on hda2 and mount it. |
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>> 11) Delete the old (renamed) /var.save and /opt.save from the temporary copy |
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>> of /, then use tar again to copy your / back to hda1. |
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>> 12) Add hda3 to the already existing volume group. |
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>> 13) (Optional) You could now move all logical volumes to hda3 and afterwards |
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>> delete hdb1 from the volume group. This would enable you to setup SW RAID 1 |
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>> (Mirroring) in the future. If you want to use all 160G, keep it as it is. |
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>> 14) reboot, without LiveCD. Hopefully your system should be up and running |
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>> now. |
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>> 15) Delete the temporary LV from step 9). |
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>> |
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>> |
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>> Enjoy your new flexibility. |
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>> |
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>> Bye... |
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>> |
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>> Dirk |
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>> |
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> |
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> OK. I did a cfdisk /dev/hdb and I found type "8E Linux LVM" and I |
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> assume that it is the one you mentioned. I have not changed anything |
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> just yet. I'm just exploring the idea here. So . . I make a boot |
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> partition like I normally would, hda1. Then create another partition |
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> that is the LVM type, primary or logical or doesn't matter? Is that |
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> correct? Is that all I have to do with cfdisk? I assume the rest is |
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> done elsewhere. This is the part I am trying to get my head wrapped |
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> around. I can't seem to figure out how it gets split up quite yet. |
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> Maybe you can "dummy" it down a bit for me? LOL |
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> |
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> Can I also assume the 2006 Gentoo CD supports this? You also realize |
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> this is going to screw up my uptime? It sounds like this may be worth |
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> it though. Alexander mentioned a snapshot. Is that like making a |
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> backup? Sounds like a windoze restore point or whatever they call |
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> that thing. I don't use windoze at all here. I just mess with |
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> everybody elses crap. |
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> |
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> My plan, copy my OS over to hdb, then set up LVM or EVMS on hda and |
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> then copy it back. I like my Maxtor since it is faster. All this |
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> from the Gentoo CD of course. I'm OK with that Gentoo CD. It only |
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> took me about three times to get my install to boot. O_O I plan to |
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> eventually use all 160GB of space but the mirror sounds neat too. I'm |
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> on dial-up so I can't fill up a hard drive to fast anyway. Sucky |
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> 26K. :-( |
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> |
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> Thanks for the help. Links are welcome. I try to read as much as I |
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> can. |
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> |
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> Dale |
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> |
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> :-) :-) :-) |
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___________________________________________________________________________ |
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Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! |
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Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses |
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http://fr.answers.yahoo.com |
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