Raid1 replaced with raid10?

2007-05-04 Thread Peter Rabbitson
Hi, I asked this question back in march but received no answers, so here it goes again. Is it safe to replace raid1 with raid10 where the amount of disks is equal to the amount of far/near/offset copies? I understand it has the downside of not being a bit-by-bit mirror of a plain filesystem. Are

Re: Raid1 replaced with raid10?

2007-05-04 Thread Bill Davidsen
Peter Rabbitson wrote: Hi, I asked this question back in march but received no answers, so here it goes again. Is it safe to replace raid1 with raid10 where the amount of disks is equal to the amount of far/near/offset copies? I understand it has the downside of not being a bit-by-bit mirror of

raid10 on centos 5

2007-05-04 Thread Ruslan Sivak
I am trying to set up raid 10 and so far with no luck. I have 4 drives, and Anaconda will not let me do raid 10. mdadm doesn't have the raid 10 personality loaded. When I create the array manually like so: 2 drives in /dev/md11 as raid1 2 drives in /dev/md12 as raid1 md11 and md12 in

RE: raid10 on centos 5

2007-05-04 Thread Patrick_Boyd
No LVM over the two RAID 1's is more like RAID 1c which is just a concatenation of RAID 1's. You don't get the striping that you get in RAID 10. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ruslan Sivak Sent: Friday, May 04, 2007 11:22 AM To:

Re: raid10 on centos 5

2007-05-04 Thread Ruslan Sivak
[EMAIL PROTECTED] wrote: No LVM over the two RAID 1's is more like RAID 1c which is just a concatenation of RAID 1's. You don't get the striping that you get in RAID 10. That's what I guessed. Can anyone let me know if it's possible to set up a real md raid10? Do I need to custom compile

Re: raid10 on centos 5

2007-05-04 Thread Justin Piszcz
cat /proc/mdstat is the raid10 personality installed? On Fri, 4 May 2007, Ruslan Sivak wrote: [EMAIL PROTECTED] wrote: No LVM over the two RAID 1's is more like RAID 1c which is just a concatenation of RAID 1's. You don't get the striping that you get in RAID 10. That's what I guessed.

Re: raid10 on centos 5

2007-05-04 Thread Ruslan Sivak
Justin Piszcz wrote: cat /proc/mdstat is the raid10 personality installed? No, it's not. How would I go about installing it? Personalities: [raid0] [raid1] [raid6] [raid5] [raid4] Russ - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL

Re: raid10 on centos 5

2007-05-04 Thread Justin Piszcz
Compile into the kernel, boot new kernel then create your RAID 10 volume with mdadm :) On Fri, 4 May 2007, Ruslan Sivak wrote: Justin Piszcz wrote: cat /proc/mdstat is the raid10 personality installed? No, it's not. How would I go about installing it? Personalities: [raid0] [raid1]

Re: raid10 on centos 5

2007-05-04 Thread Ruslan Sivak
Justin Piszcz wrote: Compile into the kernel, boot new kernel then create your RAID 10 volume with mdadm :) So a custom kernel is needed? Is there a way to do a kickstart install with the new kernel? Or better yet, put it on the install cd? Russ - To unsubscribe from this list: send

Re: raid10 on centos 5

2007-05-04 Thread Justin Piszcz
Unsure for CentOS, I use Debian and always compile my own kernel. Justin. On Fri, 4 May 2007, Ruslan Sivak wrote: Justin Piszcz wrote: Compile into the kernel, boot new kernel then create your RAID 10 volume with mdadm :) So a custom kernel is needed? Is there a way to do a kickstart

Re: raid10 on centos 5

2007-05-04 Thread David Greaves
Ruslan Sivak wrote: So a custom kernel is needed? Is there a way to do a kickstart install with the new kernel? Or better yet, put it on the install cd? have you tried: modprobe raid10 ? David - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to

Re: raid10 on centos 5

2007-05-04 Thread Ruslan Sivak
David Greaves wrote: Ruslan Sivak wrote: So a custom kernel is needed? Is there a way to do a kickstart install with the new kernel? Or better yet, put it on the install cd? have you tried: modprobe raid10 ? David Yes, no such luck. Russ - To unsubscribe from this list:

RE: raid10 on centos 5

2007-05-04 Thread Guy Watkins
} -Original Message- } From: [EMAIL PROTECTED] [mailto:linux-raid- } [EMAIL PROTECTED] On Behalf Of Ruslan Sivak } Sent: Friday, May 04, 2007 12:22 PM } To: linux-raid@vger.kernel.org } Subject: raid10 on centos 5 } } I am trying to set up raid 10 and so far with no luck. I have 4

RE: RAID6 question

2007-05-04 Thread Guy Watkins
} -Original Message- } From: [EMAIL PROTECTED] [mailto:linux-raid- } [EMAIL PROTECTED] On Behalf Of Guy Watkins } Sent: Saturday, April 28, 2007 8:52 PM } To: linux-raid@vger.kernel.org } Subject: RAID6 question } } I read in processor.com that Adaptec has a RAID 6/60 that is patented. }

Re: raid10 on centos 5

2007-05-04 Thread Ruslan Sivak
Eli Stair wrote: You shouldn't need to build a new kernel, just extract the SRPM for the initial install (CentOS 5, no updated kernels), use the config for the appropriate kernel (SMP, UP, i386/x86_64), enable the raid10 module and do a 'make modules'. You may need to do a minor amount of

Re: raid10 on centos 5

2007-05-04 Thread Eli Stair
You shouldn't need to build a new kernel, just extract the SRPM for the initial install (CentOS 5, no updated kernels), use the config for the appropriate kernel (SMP, UP, i386/x86_64), enable the raid10 module and do a 'make modules'. You may need to do a minor amount of tweaking in the

RE: raid10 on centos 5

2007-05-04 Thread Guy Watkins
} -Original Message- } From: Ruslan Sivak [mailto:[EMAIL PROTECTED] } Sent: Friday, May 04, 2007 7:22 PM } To: Guy Watkins } Cc: linux-raid@vger.kernel.org } Subject: Re: raid10 on centos 5 } } Guy Watkins wrote: } } -Original Message- } } From: [EMAIL PROTECTED]