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тАО02-13-2003 02:40 PM
тАО02-13-2003 02:40 PM
VA7100 RAID Allocations
Command View shows the following allocations:
Logical Drives 94 GB
Unallocated 59 GB
Redundancy 79 GB
Active Spare 33 GB
Do I have to add more disks to get a more even balance between raid 5 and raid 0 + 1? Or is there a command I need to run?
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тАО02-13-2003 02:48 PM
тАО02-13-2003 02:48 PM
Re: VA7100 RAID Allocations
It might be useful if you provided more info on your array and environment (firmware rev, bdf, complete stats from the array, etc).
Regards, --bmr
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тАО02-13-2003 02:49 PM
тАО02-13-2003 02:49 PM
Re: VA7100 RAID Allocations
try creating one more LUN, for example, 30GB in size and look if VA behavior will change. Attach armdsp -a output to your next reply
Eugeny
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тАО02-13-2003 02:56 PM
тАО02-13-2003 02:56 PM
Re: VA7100 RAID Allocations
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тАО02-13-2003 03:01 PM
тАО02-13-2003 03:01 PM
Re: VA7100 RAID Allocations
Please let us know on your testing after LUN creation
Eugeny
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тАО02-14-2003 06:27 AM
тАО02-14-2003 06:27 AM
Re: VA7100 RAID Allocations
data...from what I can tell in the early stages of investgating this most of the data form this new LUN is being stored in 5DP Mode. Also
check on the pre-existing LUN 1 and all 50GB still stored in 5DP. This a production box so I do not want to be carefull in looking at this. Thanks for the note about HP18. Then upgrade is planned for some scheduled downtime in April....I will also change the FC port to fabric at that time as this array is direct attached. Thanks for the help and as the testing continues I will post the results.
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тАО02-14-2003 09:23 AM
тАО02-14-2003 09:23 AM
Re: VA7100 RAID Allocations
It takes a switch (the "fabric device") to allow you to operate in 'fabric login' mode. This allows your FC HBA and storage device to run in full-duplex mode, which can double your bandwidth (or not, depending on your typical access pattern).
If you have apps that more or less read and write equally, most of the time, and they are all fairly busy, full-duplex will help a lot. If you have one app, and it mostly reads, you won't see any perceptible difference in overall performance.
Also, to add a fabric while still maintaining no single point of failure in your storage scheme, you need to add a pair of switches, not just one. So, going "fabric" just for performance adds some appreciable cost, and needs to be approached intelligently to be sure you'll get the benefit you expect.
Fortunatly, if no other servers are involved (i.e., no need for security or zoning), HP sells the 8-port Brocade 2Gb FC switches in an "Entry" configuration, meaning no zoning functionality. In this limited application, the switches are under $5K each.
So, there are some considerations to going "fabric". Hope the background helps...
--bmr
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тАО02-17-2003 09:09 AM
тАО02-17-2003 09:09 AM
Re: VA7100 RAID Allocations
Still cannot understand why the VA7100 wants to allocate all the space as 5dp even the new LUN I made is 99% stored in 5dp.
I think at my next cycle of upgrades in a few months a will redo the luns and the array and just force the va7100 in use 1+0 all the time.
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тАО02-17-2003 09:34 AM
тАО02-17-2003 09:34 AM
Re: VA7100 RAID Allocations
Eugeny
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тАО02-17-2003 09:37 AM
тАО02-17-2003 09:37 AM
Re: VA7100 RAID Allocations
Eugeny