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06-06-2002 06:02 AM
06-06-2002 06:02 AM
VA7400 Hot spare/redundancy
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06-06-2002 08:13 AM
06-06-2002 08:13 AM
Re: VA7400 Hot spare/redundancy
You can change space reserved for Active Hot Spare. If you have not changed Active Hot Spare mode yet, it is in default mode called Automatic which means: VA will reserve space of largest disk for hot spare per redudancy group if you have less than 15 disks per RG, or space of 2 largest disk per RG if you have more than 15 disks per RG. This can be changed to 0 or 1 largest disk.
CommandView command is armmgr option -h
None or
Automatic or
LargestDisk or
LargestTwoDisk.
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06-06-2002 01:09 PM
06-06-2002 01:09 PM
Re: VA7400 Hot spare/redundancy
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06-06-2002 02:39 PM
06-06-2002 02:39 PM
Re: VA7400 Hot spare/redundancy
The redundancy is the RAID overhead. For RAID 1 and 0/1, it's 50% (the data is mirrored). For RAID5DP, it's dependent on the number of drives (and their size) in the redundancy group - it always uses 2 (effectively).
How it (RAID5DP) really works is for each stripe of data on the RG, it keeps 2 parity blocks (one XOR parity and the other CRC). RAID5Dp generally uses significantly less space for redundancy than RAID0/1.
If you're not using AutoRAID, you can recover a lot of that redundancy space by switching to AutoRAID.
The net of all this is: you WANT that space for redundancy - otherwise, a disk going bad will destroy your data!
BTW: I don't suggest you run without active spares. If you have a disk fail, the unit will rebuild your data on the spare. With no spare, and enough disk failures, you *will* lose all your data.
Good luck!
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08-07-2002 03:57 AM
08-07-2002 03:57 AM
Re: VA7400 Hot spare/redundancy
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08-07-2002 04:00 AM
08-07-2002 04:00 AM
Re: VA7400 Hot spare/redundancy
raid 0
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