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Configuring RAID recovery

	General considerations
	RAID recovery mode of ZAR 8.4 is used to recover data when the array configuration (such as stripe size, or the order of the array member disks) is lost. If you determine the situation involves RAID reconstruction, select the appropriate mode in Task types. The drives should be accessible as a separate devices. This means you should either connect them to the regular (non-RAIDed) ports, or reconfigure the RAID controller as required to provide access to the drives independently.

	Array member disks selection
	Select disks which are members of the array. If the array is RAID5 with one disk missing, select all available array members - the missing disk will be reconstructed based on the RAID5 parity data.

	Array layout types and stripe sizes
	There are three layout types available, namely RAID0, RAID5 "Checkerboard", and RAID5 "MS/LDM". Microsoft Windows 2000/2003 uses "MS/LDM" layout for its software RAID5 arrays. Stripe sizes are measured in sectors, rather than in kilobytes. Calculation is simple: 1KB = 2 sectors. Maximum stripe size limit is 512 sectors (256KB). Generally, stripe size detection is pretty reliable, so it is recommended that you leave this setting as is. Factory default is minimum 2, maximum 512 sectors.

	Input restrictions and recommendations
	Generally, search for a RAID0 is cheaper than for a RAID5. Worst case overhead is to search for a RAID5 when there isn't one (parity will be recalculated out of the anticipation that one of the member disks is missing, which is costly in terms of execution time). If you know the array is RAID0, clear all RAID5 derivatives in the "Possible Layouts" box. If one disk is missing from a RAID5 array, mark all the available members of the array. The missing disk will be reconstructed automatically. When not sure to choose either "LDM" or "Checkerboard" RAID5 layout, select both. Avoid ordering to search the drive that was not a member of the array. This is especially important in case of a RAID5, because an additional drive will cause parity recalculation, resulting in even more disks to search, and the algorithm might get lost in all the possibilities.

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General usage

RAID reconstruction process

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