Re: md RAID 10 on Linux 2.6.20?
On Thu, 22 Nov 2007 22:09:27 -0500, [EMAIL PROTECTED] said: [ ... ] a RAID 10 personality defined in md that can be implemented using mdadm. If so, is it available in 2.6.20.11, [ ... ] Very good choice about 'raid10' in general. For a single layer just use '-l raid10'. Run 'man mdadm', the '-l' option and also the '-p' option for the more exotic variants. Also 'man 4 md' the RAID10 section. The pairs are formed naturally out of the block device list (first with second listed, and so on). 8 drive RAID 10 would actually consist of 5 md devices (four RAID 1's and one RAID 0). [ ... ] one RAID 10, that would of course be better both in terms of management and probably performance I would guess. [ ... ] Indeed easier in terms of management and there are some interesting options for layout. Not sure about performance, as sometimes I have seen strange interactions with the page cache either way, but usually '-l raid10' is the way to go as you say. - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: md RAID 10 on Linux 2.6.20?
[EMAIL PROTECTED] wrote: Hi all, I am running a home-grown Linux 2.6.20.11 SMP 64-bit build, and I am wondering if there is indeed a RAID 10 personality defined in md that can be implemented using mdadm. If so, is it available in 2.6.20.11, or is it in a later kernel version? In the past, to create RAID 10, I created RAID 1's and a RAID 0, so an 8 drive RAID 10 would actually consist of 5 md devices (four RAID 1's and one RAID 0). But if I could just use RAID 10 natively, and simply create one RAID 10, that would of course be better both in terms of management and probably performance I would guess. Is this possible? Yes, and you are correct on the performance. Read the man page section on near and far copies of data carefully, and some back posts to this list. Most of us find that using far copies generates slightly slower write performance and significantly better read performance. -- bill davidsen [EMAIL PROTECTED] CTO TMR Associates, Inc Doing interesting things with small computers since 1979 - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
md RAID 10 on Linux 2.6.20?
Hi all, I am running a home-grown Linux 2.6.20.11 SMP 64-bit build, and I am wondering if there is indeed a RAID 10 personality defined in md that can be implemented using mdadm. If so, is it available in 2.6.20.11, or is it in a later kernel version? In the past, to create RAID 10, I created RAID 1's and a RAID 0, so an 8 drive RAID 10 would actually consist of 5 md devices (four RAID 1's and one RAID 0). But if I could just use RAID 10 natively, and simply create one RAID 10, that would of course be better both in terms of management and probably performance I would guess. Is this possible? Thanks in advance! Best regards, Thomas Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: md RAID 10 on Linux 2.6.20?
On Thursday November 22, [EMAIL PROTECTED] wrote: Hi all, I am running a home-grown Linux 2.6.20.11 SMP 64-bit build, and I am wondering if there is indeed a RAID 10 personality defined in md that can be implemented using mdadm. If so, is it available in 2.6.20.11, or is it in a later kernel version? In the past, to create RAID 10, I created RAID 1's and a RAID 0, so an 8 drive RAID 10 would actually consist of 5 md devices (four RAID 1's and one RAID 0). But if I could just use RAID 10 natively, and simply create one RAID 10, that would of course be better both in terms of management and probably performance I would guess. Is this possible? Why don't you try it and see, or check the documentation? But yes, there is native RAID10 in 2.6.20. NeilBrown - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
