Measurements with FDDRL and ETERNUS CS8200 VTL

The FDDRL backups on Logical Volumes of a ETERNUS CS8200 VTL were performed with the same configuration used in the previous HSMS/ARCHIVE backup chapter:

• Server: SE710-20D (1220 RPF)
• Storage-System: ETERNUS DX8700, 16 Gbit/s FC, 2,5" SSD-M Drives
  Volumes: NK2 format, 2 RAID-Groups (RAID1), 4-channel connection
• ETERNUS CS8200 VTL: FC-connection with 16 Gbit/s via 2 channels, Logical Drives (LD) IBM 03590E1A (BS2000: DEVICE-TYPE=TAPE-C4)

The following throughputs were achieved with DUMP-DISK and RELOAD-DISK with single disk to single LD, 2 disks parallel to 2 LDs, and 2 disks multiplex (MUX) to 1 LD, both with FastDPAV and without PAV:

FDDRL	FDDRL throughput (MB/s)
	DUMP FastDPAV	RELOAD FastDPAV	DUMP without PAV	RELOAD without PAV
1 disk	297	245	275	202
2 disk	588	464	553	398
2 disk MUX	295	247	294	250

In all cases with FastDPAV as well as with 2 disks and Multiplexing without PAV the virtual drives posed the bottleneck.