Re: Are there rescue disks that recognise LVM2 and RAID
On Mon, Apr 03, 2006 at 08:52:36AM +0200, Francesco Pietra wrote: > notice that for budgetary reasons i am setting up raid1 with a couple of > low-cost 300GB SATA hds. People have been reporting problems lately having trouble getting the Linux kernel to tell which SATA disk is which. Could having RAID1, which makes the contents of the two drives identical, finesse this difficulty? -- hendrik -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Are there rescue disks that recognise LVM2 and RAID
On Mon, Apr 03, 2006 at 08:52:36AM +0200, Francesco Pietra wrote: > thank you. to summarize, from the point of view of security (i mean security > to save the os, not the data, which can be easily saved elsewhewere) is that > better to make raid1 (amd64 dual) through linux-debian software or to make What speaks for software RAID is performance (only very expensive RAID controllers are faster), and ease of recovery in case of hardware (motherboard) failure. You would typically need a spare RAID controller, which will become rather expensive. > hardware raid1 ? (as far as i understand even hardware raid1 involves some > software and if hardware fails to boot, how to boot?). > > notice that for budgetary reasons i am setting up raid1 with a couple of > low-cost 300GB SATA hds. i had preferred expensive SATA, just to have the It is typically useful to choose enterprise-level SATA drives, because these are designed to run through 24/7/365. > scsi-type mechanics, or i had preferred totaly scsi but for the hd size i > need for the computations the budget and the complexity of higher raid > prevented me to go on with scsi. You could have gone with software RAID on SCSI. But of course SCSI is still at least as twice as expensive as 1 rpm 160 GByte Raptors... -- Eugen* Leitl http://leitl.org";>leitl http://leitl.org __ ICBM: 48.07100, 11.36820http://www.ativel.com 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE signature.asc Description: Digital signature
Re: Are there rescue disks that recognise LVM2 and RAID
thank you. to summarize, from the point of view of security (i mean security to save the os, not the data, which can be easily saved elsewhewere) is that better to make raid1 (amd64 dual) through linux-debian software or to make hardware raid1 ? (as far as i understand even hardware raid1 involves some software and if hardware fails to boot, how to boot?). notice that for budgetary reasons i am setting up raid1 with a couple of low-cost 300GB SATA hds. i had preferred expensive SATA, just to have the scsi-type mechanics, or i had preferred totaly scsi but for the hd size i need for the computations the budget and the complexity of higher raid prevented me to go on with scsi. francesco On Monday 03 April 2006 03:06, [EMAIL PROTECTED] wrote: > On Sun, Apr 02, 2006 at 08:58:27PM -0400, [EMAIL PROTECTED] wrote: > > On Sun, Apr 02, 2006 at 09:16:19PM +0200, Alexander Sieck wrote: > > > On Sun, Apr 02, 2006 at 03:00:15PM +0200, Francesco Pietra wrote: > > > > Why is rescue needed when raid1. please explain > > > > francesco pietra > > > > > > RAID1 does not protect you to do: 'rm -rf /*' as root, just as one > > > example. > > > > Not if you upgrade a kernel and fail to make sure that the new one > > supports RAID or if it happens to have a subtly broken version of LVM > > or something. Or if you manage accidentally to set up lilo to boot only > > and unbootable system or ... > > Or if you reconfigure your RAID and you make a mistake and your RAID > partitions contain files essential to the boot process > > -- hendrik -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Are there rescue disks that recognise LVM2 and RAID
On Sun, Apr 02, 2006 at 08:58:27PM -0400, [EMAIL PROTECTED] wrote: > On Sun, Apr 02, 2006 at 09:16:19PM +0200, Alexander Sieck wrote: > > On Sun, Apr 02, 2006 at 03:00:15PM +0200, Francesco Pietra wrote: > > > Why is rescue needed when raid1. please explain > > > francesco pietra > > > > > RAID1 does not protect you to do: 'rm -rf /*' as root, just as one example. > > Not if you upgrade a kernel and fail to make sure that the new one > supports RAID or if it happens to have a subtly broken version of LVM > or something. Or if you manage accidentally to set up lilo to boot only > and unbootable system or ... Or if you reconfigure your RAID and you make a mistake and your RAID partitions contain files essential to the boot process -- hendrik -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Are there rescue disks that recognise LVM2 and RAID
On Sun, Apr 02, 2006 at 09:16:19PM +0200, Alexander Sieck wrote: > On Sun, Apr 02, 2006 at 03:00:15PM +0200, Francesco Pietra wrote: > > Why is rescue needed when raid1. please explain > > francesco pietra > > > RAID1 does not protect you to do: 'rm -rf /*' as root, just as one example. Not if you upgrade a kernel and fail to make sure that the new one supports RAID or if it happens to have a subtly broken version of LVM or something. Or if you manage accidentally to set up lilo to boot only and unbootable system or ... -- hendrik -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Are there rescue disks that recognise LVM2 and RAID
On Sun, Apr 02, 2006 at 04:57:24AM -0400, [EMAIL PROTECTED] wrote: > I'm running an AMD64 etch system with most of the file system on > LVM2 on RAID-1. > > Are there rescue disks I could use in case things go wrong? AFAIK, most > rescue disks are for i386 and don't recognise RAID and LVM properly. The grml live-cd was made for tasks like that. It's not 64 bit but that shouldn't matter when rescuing a system ;-) Take a look at it: http://www.grml.org/ greets Jimmy -- Andreas "Jimmy" Gredler ,'"`. http://www.jimmy.co.at/ | [EMAIL PROTECTED] ( grml.org -ยป Linux for texttool-users and sysadmins `._, http://www.grml.org/| [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Are there rescue disks that recognise LVM2 and RAID
On Sun, Apr 02, 2006 at 03:00:15PM +0200, Francesco Pietra wrote: > Why is rescue needed when raid1. please explain > francesco pietra > RAID1 does not protect you to do: 'rm -rf /*' as root, just as one example. Alexander -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Are there rescue disks that recognise LVM2 and RAID
Why is rescue needed when raid1. please explain francesco pietra On Sunday 02 April 2006 10:57, [EMAIL PROTECTED] wrote: > I'm running an AMD64 etch system with most of the file system on > LVM2 on RAID-1. > > Are there rescue disks I could use in case things go wrong? AFAIK, most > rescue disks are for i386 and don't recognise RAID and LVM properly. > > -- hendrik -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Are there rescue disks that recognise LVM2 and RAID
On Sun, Apr 02, 2006 at 04:57:24AM -0400, [EMAIL PROTECTED] wrote: > I'm running an AMD64 etch system with most of the file system on > LVM2 on RAID-1. > > Are there rescue disks I could use in case things go wrong? AFAIK, most > rescue disks are for i386 and don't recognise RAID and LVM properly. > > -- hendrik > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > Hello, check mondo. It is currently not in testing for amd64, but in unstable. mondo (2.06-4+b1, 2.06-4) powerful disaster recovery suite ... Mondo is comprehensive. Mondo supports LVM, RAID, ext2, ext3, JFS, XFS, ReiserFS, VFAT, and can support additional file systems easily. ... Another possibility is mkCDrec http://mkcdrec.ota.be/project/index.html but as far as I know, it is not included in Debian (yet). ... MkCDrec supports ext2 , ext3, minix, xfs , jfs, reiserfs file systems, LVM and software RAID (multiple devices). ... Alexander -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Are there rescue disks that recognise LVM2 and RAID
Hi! Almost everything you could need fore rescuing a system can be done be booting a live system CD/DVD. I would recommend using KANOTIX 64, which is a debian derivative and runs quite fine. Sure, rescuing would be a little tricky this way, but therefor it supports RAID, LVM, almost every available device (nice on notebooks!) and so on. Christoph [EMAIL PROTECTED] wrote: Are there rescue disks I could use in case things go wrong? AFAIK, most rescue disks are for i386 and don't recognise RAID and LVM properly. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Are there rescue disks that recognise LVM2 and RAID
I'm running an AMD64 etch system with most of the file system on LVM2 on RAID-1. Are there rescue disks I could use in case things go wrong? AFAIK, most rescue disks are for i386 and don't recognise RAID and LVM properly. -- hendrik -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
