3Ware 9550SX-4LP User Guide - Page 163

Changing An Existing Configuration Table 9: Valid Migration Paths Destination Source R0 R1 R5 R10 R50 Single JBOD Spare R0 R1 R5 R10 R50 Single JBOD Spare Yes No Yes Yes Yes No No No Yes No Yes Yes Yes Yes No No Yes No Yes Yes Yes No No No Yes No Yes Yes Yes No No No Yes No Yes Yes Yes No No No Yes Yes Yes Yes Yes No No No No No No No No No No No No No No No No No No No Warning: Never split a mirror into 2 single (identical) drives that you are booted or mounted from. The file system on the second drive will be left in an unclean state since any pending writes cannot be completed after the split occurs. Changing RAID Level You can use migrate to change the RAID level of an existing unit while the unit is online, without experiencing any data loss. When you change a RAID level, you may also add one or more drives to the unit. You can also migrate to change the unit's stripe size. For example, a four-drive RAID 5 with a 64KB stripe size can be migrated to a four-drive RAID 5 with 256KB stripe size. The steps below describe how to change a RAID level in 3DM2. Note: Once migration starts, the unit stays in the migrating state until the migration process is complete. The migration process cannot be aborted, and must be allowed to finish before a rebuild or verify to the unit is permitted. Warning: It is important that you allow migration to complete before adding to the unit. Making physical changes to the unit during migration may cause the migration process to stop, and can jeopardize the safety of your data. www.3ware.com 153