Compaq ProSignia 500 Compaq Backup and Recovery for Microsoft SQL Server 6.X - Page 55
Network Layout: Backup of 4 Servers Across 1 Shared 100Base-T Segment
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Compaq Backup and Recovery for Microsoft SQL Server 6.x Page 55 storage server is to avoid creating a serialization point at the storage server's network interface while it processes incoming requests from multiple sources75. The network layout is shown in Figure 2. Figure 2 - Network Layout: Backup of 4 Servers Across 1 Shared 100Base-T Segment The storage server dedicated a tape drive group for each concurrent backup job using the ARCserve Manager, and the RAID Option was used to stripe the drives in each group. RAID-0 arrays of 2 drives each were configured for each concurrent backup job up to 4 jobs, and RAID-5 arrays of 3 drives were configured for up to 2 jobs. More than 2 RAID-5 arrays could not be configured as ARCserve supports only 8 drives and each RAID-5 array requires at least 3 drives. With this setup, backup jobs were initiated simultaneously on from 2 to 4 database servers. The below chart shows the throughput results, average CPU and PCI bus76 usages on the tape server, and the average utilization of the network: 75 Slower performance was observed when using only a single NIC on the storage server to receive data from up to 4 other servers. 76 The PCI % usage shown in the chart was taken as an average of the load observed between the 2 peer-buses. 1997 Compaq Computer Corporation, All Rights Reserved Doc No 444A/0797