Hi all,
I very enjoyed this thread and cannot resist my experience regarding this
issue.
Holger
WARNING: Of cause all data are specific to the current test environment and
just should give you an impression what combinations of store/restore
parameters can lead to what elapsed time in this special environment; but
there should be no problem to adapt the results to other systems if you keep
in mind the change in CPU power and IO bus bandwidth.
Test environment:
-----------------
979-200, MPE/iX 5.5, pp C.55.07, 256 MB main memory, 2 x ST34371W FWSCSI
discs in system volume set, all backup devices connected to a single
dedicated host adapter card.
For the store to disc tests a Nike model 10 with 8 mechanics was used; it
was configured in an unsupported mode (all spindles are configured as
'Individual Disk Units') which means no disc has had any redundancy
configured within in the Nike; so, this Nike simply looks like a bunch of
slow FWSCSI discs to the MPE/iX box.
Test data:
----------
All store/restore tests were based on the same amount of data to work with:
3 copies of the group PUB.SYS in a special test account, spreaded over 2
ST34371W FWSCSI discs; the total amount of data was nearly 912 MB; the
restore tests were done by simply overwrite the existing data in the system
volume set.
All DDS tests were done with a HPC1537.
1. Using native-STORE (no TurboStore) -------------------------------------
-------------------------------------
1.a) best STORE results
-----------------------
DDS1: hw comp., STORE param. MAXTAPEBUF + INTER, 1108 KB/sec
DDS2: hw comp., STORE param. MAXTAPEBUF + INTER, 1103 KB/sec
DDS3: hw comp., STORE param. MAXTAPEBUF + INTER, 1807 KB/sec
DLT4000: hw comp., STORE param. MAXTAPEBUF, 2700 KB/sec
DLT7000: hw comp., STORE param. MAXTAPEBUF, 3958 KB/sec
1.b) best RESTORE results by tape created with
----------------------------------------------
DDS1: hw comp., STORE param. MAXTAPEBUF, 1054 KB/sec
DDS2: hw comp., STORE param. MAXTAPEBUF + INTER, 1052 KB/sect
DDS3: hw comp., STORE param. MAXTAPEBUF, 1303 KB/sec
DLT4000: hw comp., STORE param. MAXTAPEBUF, 2066 KB/sec
DLT7000: hw comp., STORE param. MAXTAPEBUF + INTER, 2723 KB/sec
2. using TURBOSTORE
-------------------
-------------------
2.a best STORE results
----------------------
DDS1: hw comp., MAXTAPEBUF + INTER + COMPRESS=LOW, 1126 KB/sec
DDS2: hw comp., MAXTAPEBUF + COMPRESS=LOW, 1117 KB/sec
DDS3: hw comp., MAXTAPEBUF, 1807 KB/sec
DLT4000: hw comp., MAXTAPEBUF + COMPRESS=LOW, 3043 KB/sec
DLT7000: hw comp., MAXTAPEBUF + COMPRESS=LOW, 4133 KB/sec
disk: MAXTAPEBUF + INTER + COMPRESS=LOW, 4891 KB/sec
2.b best RESTORE results by tape created with
------------------------------------------------------
DDS1: hw comp., MAXTAPEBUF + INTER + COMPRESS=LOW, 1086 KB/sec
DDS2: hw comp., MAXTAPEBUF + INTER + COMPRESS=LOW, 1061 KB/sec
DDS3: MAXTAPEBUF + INTER + COMPRESS=HIGH, 1355 KB/sec
DLT4000: MAXTAPEBUF + INTER + COMPRESS=HIGH, 2371 KB/sec
DLT7000: MAXTAPEBUF + COMPRESS=HIGH, 3023 KB/sec
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