Create a super tmpfs by constructing a RAID-0 array of remote RAM disks using TGT and iSCSI. In this example we'll export two 25 GB remote RAM disks and use mdadm for the RAID device. Format them with ext4 and disable journaling for a fast in-memory file system.

On the target (server):

# ramdisk 1
mkdir /tmp/rd1
mount -t tmpfs -o size=25G tmpfs /tmp/rd1
dd if=/dev/zero of=/tmp/rd1/lun bs=1M

# ramdisk 2
mkdir /tmp/rd2
mount -t tmpfs -o size=25G tmpfs /tmp/rd2
dd if=/dev/zero of=/tmp/rd2/lun bs=1M

# target 1
tgtadm --lld iser --op new --mode target --tid 1 -T iqn.2015-01.cln5.rd1
tgtadm --lld iser --op bind --mode target --tid 1 -I ALL
tgtadm --lld iser --op new --mode logicalunit --tid 1 --lun 1 --backing-store /tmp/rd1/lun

# target 2
tgtadm --lld iser --op new --mode target --tid 2 -T iqn.2015-01.cln5.rd2
tgtadm --lld iser --op bind --mode target --tid 2 -I ALL
tgtadm --lld iser --op new --mode logicalunit --tid 2 --lun 1 --backing-store /tmp/rd2/lun

On the client (initiator) connect to the devices using a tool such as iscsiadm. Then create the RAID array and file system:

# create the raid array
mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/sdb /dev/sdc

# setup the file system
mkfs.ext4 -b 4096 -O ^has_journal /dev/md0

And there you have it.