https://community.hpe.com/t5/disk-enclosures/eva-leveling-and-sparing/m-p/4710082#M36209 hi experts <BR />i need your help i am soo confused about leveling and sparing<BR />sparing is the reconstruction of data using the raid.<BR />leveling is redistribution of data across all disks in disk group.<BR />my question is<BR />1)the protection level is used for sparing only or also to make the leveling<BR />2)if i have an occupancy level of 98% but i have no disk failure just i want to add disks leveling can occur with no problem? if no for what i need free space for redistributing data? Sat, 06 Nov 2010 12:56:29 GMT ilayy 2010-11-06T12:56:29Z https://community.hpe.com/t5/disk-enclosures/eva-leveling-and-sparing/m-p/4710082#M36209 hi experts <BR />i need your help i am soo confused about leveling and sparing<BR />sparing is the reconstruction of data using the raid.<BR />leveling is redistribution of data across all disks in disk group.<BR />my question is<BR />1)the protection level is used for sparing only or also to make the leveling<BR />2)if i have an occupancy level of 98% but i have no disk failure just i want to add disks leveling can occur with no problem? if no for what i need free space for redistributing data? Sat, 06 Nov 2010 12:56:29 GMT https://community.hpe.com/t5/disk-enclosures/eva-leveling-and-sparing/m-p/4710082#M36209 ilayy 2010-11-06T12:56:29Z https://community.hpe.com/t5/disk-enclosures/eva-leveling-and-sparing/m-p/4710083#M36210 'sparing' is not the 'reconstruction' of data...<BR /><BR />The "protection level" defines the amount of spaced reserved in the disk group to be able to reconstruct data after a disk drive has failed. Think of it as a set of "virtualized spare disks".<BR /><BR />It is important to understand that the "protection level" does NOT provide any data redundancy. That is only done by the VRAID-level (1,5,6) of a virtual disk.<BR /><BR />You can create a virtual disk with VRAID-0, define the "protection level" to 'double', but you WILL lose data when a disk drive in that disk group fails.<BR /><BR /><BR />According to some best practices paper, the EVA should be able to do leveling as long as at least 5 GigaBytes are free in a disk group. Sat, 06 Nov 2010 15:14:55 GMT https://community.hpe.com/t5/disk-enclosures/eva-leveling-and-sparing/m-p/4710083#M36210 Uwe Zessin 2010-11-06T15:14:55Z