Wazzzzzzzzzza
IS-IT--Management
We are using ArcServe 6.61 Enterprise Edition on an NT Server (SP6) with an Exabyte Mammoth M2 Tape Drive.
By default we enabled "Hardware Compression" (in the Device Manager) for all our backups and until recently we could fit a 70GB backup onto one tape. A sample job log for a successfully completed back would be:
Total Size (Disk) . . . . . . . . . . 69,685.99 MB
Total Size (Media) . . . . . . . . 70,756.18 MB
Elapsed Time . . . . . . . . . . . . 5h 41m 51s
Average Throughput . . . . . .206.95 MB/min
Last week, a second tape was needed to complete the backup. We disabled Hardware Compression and enabled "Software Compression" with the following results:
Total Size (Disk) . . . . . . . . . . 70,852.42 MB
Total Size (Media) . . . . . . . . 49,932.25 MB
Elapsed Time . . . . . . . . . . . . 17h 40m 0s
Average Throughput . . . . . . 66.79 MB/min
Although the backup completed on one tape, at 17 hours, the performance is unacceptably slow!
My questions are:
1. A compression ratio of approximately 30% is achieved via software compression. How can I see what degree of compression is performed when "hardware compression" is enabled.
2. Are these performance figures "common" for Software Compression? Although our ArcServe Server is old (it used to be our SAP server!) it has 4 x Pentium Pro 200Mhz and 4GB of RAM - which should be sufficient.
Thanks
By default we enabled "Hardware Compression" (in the Device Manager) for all our backups and until recently we could fit a 70GB backup onto one tape. A sample job log for a successfully completed back would be:
Total Size (Disk) . . . . . . . . . . 69,685.99 MB
Total Size (Media) . . . . . . . . 70,756.18 MB
Elapsed Time . . . . . . . . . . . . 5h 41m 51s
Average Throughput . . . . . .206.95 MB/min
Last week, a second tape was needed to complete the backup. We disabled Hardware Compression and enabled "Software Compression" with the following results:
Total Size (Disk) . . . . . . . . . . 70,852.42 MB
Total Size (Media) . . . . . . . . 49,932.25 MB
Elapsed Time . . . . . . . . . . . . 17h 40m 0s
Average Throughput . . . . . . 66.79 MB/min
Although the backup completed on one tape, at 17 hours, the performance is unacceptably slow!
My questions are:
1. A compression ratio of approximately 30% is achieved via software compression. How can I see what degree of compression is performed when "hardware compression" is enabled.
2. Are these performance figures "common" for Software Compression? Although our ArcServe Server is old (it used to be our SAP server!) it has 4 x Pentium Pro 200Mhz and 4GB of RAM - which should be sufficient.
Thanks