In-memory RAID

For test purposes a RAID can be created over in-memory drives (see In-memory drives chapter). in-memory RAID shall not be used for production because in-memory drives lose its data over the engine or the server restart. Here is the example how to create an in-memory RAID by the CLI commands:

$ xnr_cli bdev malloc create --block-size 4096 --num-blocks 65536
$ xnr_cli bdev malloc create --block-size 4096 --num-blocks 65536
$ xnr_cli bdev malloc create --block-size 4096 --num-blocks 65536
$ xnr_cli bdev malloc create --block-size 4096 --num-blocks 65536
$ xnr_cli raid create --name xnraid --level 5 --chunk-size 16 --bdevs Malloc0,Malloc1,Malloc2,Malloc3
$ xnr_cli raid show --name xnraid --output tiny