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How do we achieve RAID5 using MirrorUX or LVM i.e striping with parity?

 
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Santhosh.H
Frequent Advisor

‎01-14-2002 03:36 AM

‎01-14-2002 03:36 AM

How do we achieve RAID5 using MirrorUX or LVM i.e striping with parity?

Is it possible? If yes procedure?
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Bill Hassell
Honored Contributor

‎01-14-2002 04:11 AM

‎01-14-2002 04:11 AM

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Re: How do we achieve RAID5 using MirrorUX or LVM i.e striping with parity?

Not possible with Mirror/UX and LVM. Striping with parity (RAID5) requires a tremendous amount of special code to write to all the disks in the stripe set which is why you don't often see this done in the operating system.

Now if you upgrade to 11.11, you can change from LVM to VxVM (Veritas Volume Manager) where this code is implemented. However, there will be a significant performance impact on your system when using RAID5 in software. The complexity of creating the stripes and parity records, then writing to as many as 5 disks at the same time, plus handling a disk replacement is best served in specialized hardware, not the operating system.


Bill Hassell, sysadmin
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Santhosh.H
Frequent Advisor

‎01-14-2002 04:16 AM

‎01-14-2002 04:16 AM

Re: How do we achieve RAID5 using MirrorUX or LVM i.e striping with parity?

So we cant do RAID5 with Mirrirdisk/ux sw.
Summary
MirrorDisk/ux sw is only used to achieve upto 3 disk mirroring thats it nothing more? please conform
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harry d brown jr
Honored Contributor

‎01-14-2002 04:36 AM

‎01-14-2002 04:36 AM

Re: How do we achieve RAID5 using MirrorUX or LVM i.e striping with parity?

That is correct, MirrorUX is simply mirroring, not raid5, and you may only have a few mirrors. Mirroring is done at the Logical Volume (LV [filesystem]) level, and not at the Volume Group (VG) level. MirrorUX also requires that you purchase a license from HP, and the cost will depend upon the "tier" (the type of server).

Do you have SUN experience?

live free or die
harry
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Santhosh.H
Frequent Advisor

‎01-14-2002 04:40 AM

‎01-14-2002 04:40 AM

Re: How do we achieve RAID5 using MirrorUX or LVM i.e striping with parity?

No sun experience. Only "Live free with Linux" as u state
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harry d brown jr
Honored Contributor

‎01-14-2002 04:56 AM

‎01-14-2002 04:56 AM

Re: How do we achieve RAID5 using MirrorUX or LVM i.e striping with parity?

Welcome to HPux. The reason I asked, is because it's very useful to know ones background, so that we can speak (type) to them in a language that they can easily understand. What flavor of linux do you prefer?

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harry
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Santhosh.H
Frequent Advisor

‎01-14-2002 05:03 AM

‎01-14-2002 05:03 AM

Re: How do we achieve RAID5 using MirrorUX or LVM i.e striping with parity?

HI harry d brown jr
I prefer Redhat which is more neat and simple. I tried linux mandrake 8.1 which made my system vey slow also it has too much of unnecessary graphics. I want to be hard core sys admin. There is no point working in graphics i only prefer to do the professional way. If anything interesting u can write to me at santhosh@timken.com
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