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тАО04-29-2004 09:46 AM
тАО04-29-2004 09:46 AM
getting VA7100 to do RAID 10
We recently purchased a VA7100 to connect to our N-Class HP9000.
I added several LUNs to the array using CommandView, but I don't see any option to force the LUN to use particular drives... nor are there any options to force it to use RAID 10 instead of AutoRaid.
I RTFM, and according to it I have to issue an
'armmgr -C raid10 /path/to/device', but when I do, I get an "Box Level RAID is not supported by this Array."
Any ideas? I would like to setup the LUNs and specify which physical drives they are to be associate with, as well as specify the raid levels. Is this possible?
THanks,
James
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тАО04-29-2004 08:26 PM
тАО04-29-2004 08:26 PM
Re: getting VA7100 to do RAID 10
you cannot specify which LUN uses which drives. *All* LUNs in a VA use *all* available disks in the Redundancy Group (the 7100 has only one RG), to optimize performance an flexibility.
You *could* change the setting from "raid1+0" to "hpautoraid", but you cannot do the reverse (even if you knew you had enough free space on your disks). Even for a change to autoraid a *full backup* is recommended!
Actually you do not have to explicitly set raid1+0, as long as you leave enough space available (i.e. do not assign more than about 50% of gross capacity to LUNs, the VA will always use raid1+0. It only moves the least used blocks to RAID5DP *IF* you request to assign more LUN space.
So don't touch the setting, rather add disks if you have slots available. Which will also improve performance (see above)
Regards,
Bernhard
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тАО04-30-2004 03:47 AM
тАО04-30-2004 03:47 AM
Re: getting VA7100 to do RAID 10
So, if I have 12 36GB drives, I should only create 12*36/2 = 216 GB worth of LUNs or less to get it to do RAID 1+0?
If I can't specify which LUNs use which drives (I suppose all LUNs use all drives?), is there any performance benefit to creating more than one LUN? We have one busy database, and I would've like to isolate that to it its own set of drives...
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тАО04-30-2004 06:25 AM
тАО04-30-2004 06:25 AM
Re: getting VA7100 to do RAID 10
With a VA7100, with 12 x 36 GB drives, with Active Hot Spare set to AUTO and in RAID 1+0 mode, you have a maximum amount of usable space of 196.8 GB.
Since you are in AUTORAID mode, I would think that if you keep your total space allocated to LUNs below 196.8 GB everything should stay in RAID 1+0.
In doing the calculations you have to remember that you will NOT get the full 36GB out of each disk.
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тАО04-30-2004 06:26 AM
тАО04-30-2004 06:26 AM
Re: getting VA7100 to do RAID 10
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тАО04-30-2004 06:53 AM
тАО04-30-2004 06:53 AM
Re: getting VA7100 to do RAID 10
So is there any performance benefit to using multiple LUNs instead of one big LUN?
From what I understand, it's not possible to create two LUNs and put each one on a seperate primary controller... correct?
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тАО04-30-2004 02:27 PM
тАО04-30-2004 02:27 PM
Re: getting VA7100 to do RAID 10
VA7100 has only one RG and one controller. so you can't set up multiple performance paths.
regds
Naveej
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тАО05-02-2004 02:52 PM
тАО05-02-2004 02:52 PM
Re: getting VA7100 to do RAID 10
The VA7100 can demonstrate maximum performance with a single LUN. However not all OSs will by default. If it├в s Windows, you OK. If it├в s HPUX, then you must either increase the default SCSI queue depth to 24 to 36 (for a single LUN and 36 disks), or create 3 or 4 LUNs.
BTW, if decide to create more LUNs, reformat the array and select the whole array to be RAID 1+0, you├в ll get a little more usable capacity. And, you don├в t need to stripe the LUNs, the VA will do this