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тАО12-14-2005 11:36 AM
тАО12-14-2005 11:36 AM
raid 0+1
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тАО12-14-2005 04:50 PM
тАО12-14-2005 04:50 PM
Re: raid 0+1
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тАО12-14-2005 07:11 PM
тАО12-14-2005 07:11 PM
Re: raid 0+1
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тАО12-14-2005 07:44 PM
тАО12-14-2005 07:44 PM
Re: raid 0+1
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тАО12-14-2005 09:11 PM
тАО12-14-2005 09:11 PM
Re: raid 0+1
In my humble opinion there is a huge difference...
Mirrored stripes is dangerous to use!
They are infact two stripes that you mirror.
If you loose 1 diskdrive, the entire stripe will be lost, and youre running on a RAID 0. That means that you can only loose one disk in that configuration.
Stiped mirrors on the other hand, is multiple mirrors that you stripe. That means that you can loose 50% of your drives and still be up and running.
I would never set up a mirrored stripe in a working enviroment.
But..
Who says that I'm allways right, actually I was wrong once in 1976. (-;
Regards
Dragomir Zekic
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тАО12-15-2005 01:18 AM
тАО12-15-2005 01:18 AM
Re: raid 0+1
If you loose a drive from each set you loose access to your LUN.
With 0+1,
Drives 1 2 3 4
Set 1 = 0 0 0 0
Set 2 = 0 0 0 0
Set 1 is striped and Mirrored with Set 2. If you loose a drive in Set 1, say dr2. No problem you have set 2 for backup. BUT if you loose ANY drive in the Set 2. Then you have lost all access.
With 1+0
Drives 1 2 3 4
Set 1 = 0 0 0 0
Set 2 = 0 0 0 0
Each drive from each set is Mirrored with each other, then striped. SET 1 DR1 is Mirrored with SET 2 DR1. Then continue down the line. If we loose DR2 of set 1, no problem, we have the other drive2 as a mirror. The only time you could loose access if you lost drive2 of the Set 2. As Dragomir stated, you can loose 50% of your drives as long as the drive isn't the mirrored pair.
It is a matter of odds.
BTW, MSA and Smart Array Controllers do Raid 1+0.
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тАО01-28-2006 06:17 AM
тАО01-28-2006 06:17 AM
Re: raid 0+1
how can I find what drives are in pair in raid 1 part of RAID1+0 array on SA (MSA) controllers?
If I split 1+0 array between 2 channels, are the members of pair on different channels?
This is important to understand how can array in MSA survive with enclosure failure.
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тАО01-29-2006 03:04 PM
тАО01-29-2006 03:04 PM
Re: raid 0+1
Please find the attached document. Hope this will help you to clarify..
Regards,
Shameer
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тАО01-30-2006 01:54 AM
тАО01-30-2006 01:54 AM
Re: raid 0+1
Take 6 drives, 3 from shelf A and 3 from shelf B. Disk A1 and B1 will be mirrored. A2 and B2, ...
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тАО01-30-2006 04:44 AM
тАО01-30-2006 04:44 AM