machine stops at GRUB screen during boot process
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From: Rahul on 29 Apr 2010 20:17 Bit Twister <BitTwister(a)mouse-potato.com> wrote in news:slrnhtk28t.6i2.BitTwister(a)cooker.home.test: > Yep, I set mine up to run labels. Running with /dev/xxxx can have > fstab problems when dinking around with partition/mount order. > > UUID is pretty static until you reformat and forget to set old UUID. :-( > blkid gives me: blkid /dev/mapper/VolGroup00-LogVol01: TYPE="swap" /dev/mapper/VolGroup00-LogVol00: UUID="a761cfce-afe3-468a-b6fd- ce0bb28b6a7a" TYPE="ext3" /dev/sda1: LABEL="/boot" UUID="3fc6f861-15f9-4260-b404-86dd14368f95" TYPE="ext3" /dev/sda2: TYPE="swap" /dev/sdb1: UUID="faeccc9c-6824-4f20-b425-d08a62e1d95f" TYPE="ext3" /dev/VolGroup00/LogVol01: TYPE="swap" /dev/VolGroup00/LogVol00: UUID="a761cfce-afe3-468a-b6fd-ce0bb28b6a7a" SEC_TYPE="ext2" TYPE="ext3" Would I have been better off using the UUID's in grub? Although grub itself doesn't know them I think. But I can use them on the kernel lines that are passed as linux options. On the other hand I can use LABEL's too in that context. Are there any pros and cons of using LABELs versus UUIDs in various contexts? -- Rahul
From: Bit Twister on 29 Apr 2010 21:39 On Fri, 30 Apr 2010 00:17:30 +0000 (UTC), Rahul wrote: > Are there any pros and cons of using LABELs versus UUIDs in various > contexts? Like I said, if you have to reformat after a crash, before restoring backup, you need to set reformatted partition's UUID same as value used/seen in /etc/fstab and/or in grub's menu.lst. Otherwise you have to edit the files to set new UUID values.
From: Robert Heller on 29 Apr 2010 21:45 At Thu, 29 Apr 2010 23:51:11 +0000 (UTC) Rahul <nospam(a)nospam.invalid> wrote: > > Robert Heller <heller(a)deepsoft.com> wrote in news:G- > mdnWtRPso8kUfWnZ2dnUVZ_hmdnZ2d(a)posted.localnet: > > > You don't have to worry about the LVM volumns 'moving around' because > > of device discovery order -- the volumn group works like a e[234]fs > > LABEL. You should be using LABEL= for all file systems on 'bare' on bare > > partititions (eg /dev/sd<mumble>1 for /boot). (You *can* use LABEL= for > > file systems on LVM volumns, but you don't *have* to.) > > > > But there is no way to teach grub to use LABELs or Logvols, right? No. Grub is stuck with what the BIOS understands. Grub is one up on LILO: grub understands what the ext2 file system is all about. LILO only knows about sector addresses (either CHS or LBA). To understand LABEL= and LVM requires the linux kernel itself, which is what grub or lilo need to find and load into memory. It is quite literally a bootstrapping process, hence the name: grub (and lilo) are boot[strap] loaders... > -- Robert Heller -- Get the Deepwoods Software FireFox Toolbar! Deepwoods Software -- Linux Installation and Administration http://www.deepsoft.com/ -- Web Hosting, with CGI and Database heller(a)deepsoft.com -- Contract Programming: C/C++, Tcl/Tk
From: Robert Heller on 29 Apr 2010 21:45 At Fri, 30 Apr 2010 00:17:30 +0000 (UTC) Rahul <nospam(a)nospam.invalid> wrote: > > Bit Twister <BitTwister(a)mouse-potato.com> wrote in > news:slrnhtk28t.6i2.BitTwister(a)cooker.home.test: > > > Yep, I set mine up to run labels. Running with /dev/xxxx can have > > fstab problems when dinking around with partition/mount order. > > > > UUID is pretty static until you reformat and forget to set old UUID. :-( > > > > blkid gives me: > > blkid > /dev/mapper/VolGroup00-LogVol01: TYPE="swap" > /dev/mapper/VolGroup00-LogVol00: UUID="a761cfce-afe3-468a-b6fd- > ce0bb28b6a7a" TYPE="ext3" > /dev/sda1: LABEL="/boot" UUID="3fc6f861-15f9-4260-b404-86dd14368f95" > TYPE="ext3" > /dev/sda2: TYPE="swap" > /dev/sdb1: UUID="faeccc9c-6824-4f20-b425-d08a62e1d95f" TYPE="ext3" > /dev/VolGroup00/LogVol01: TYPE="swap" > /dev/VolGroup00/LogVol00: UUID="a761cfce-afe3-468a-b6fd-ce0bb28b6a7a" > SEC_TYPE="ext2" TYPE="ext3" > > > Would I have been better off using the UUID's in grub? Although grub itself > doesn't know them I think. But I can use them on the kernel lines that are > passed as linux options. On the other hand I can use LABEL's too in that > context. > > Are there any pros and cons of using LABELs versus UUIDs in various > contexts? LABELs are more 'human friendly' -- you can set them to something you will remember and understand. UUID are machine generated sequences that have no appearent meaning. > -- Robert Heller -- Get the Deepwoods Software FireFox Toolbar! Deepwoods Software -- Linux Installation and Administration http://www.deepsoft.com/ -- Web Hosting, with CGI and Database heller(a)deepsoft.com -- Contract Programming: C/C++, Tcl/Tk
From: Rahul on 29 Apr 2010 23:12
Robert Heller <heller(a)deepsoft.com> wrote in news:NMydne_fjOuAq0fWnZ2dnUVZ_oGdnZ2d(a)posted.localnet: > LABELs are more 'human friendly' -- you can set them to something you > will remember and understand. UUID are machine generated sequences that > have no appearent meaning. > Ah ok, thanks! I thought there was something "permanant" about a uuid. Some kind of unique drive<->uuid mapping. Like a MAC address. -- Rahul |