rptest: produce more data in FullDiskReclaimTest to trigger gc condit…

…ions

For reasons not well understood each partition needs to have at least 2
segments for eviction to be triggered. We have tried to change this
condition in #22686 but
had to revert it in
#22995.

For now, produce more data to increase the chance of each partition
having at least 2 segments worth of data.

(cherry picked from commit 79d706e)

src/v/storage/disk_log_impl.cc

@@ -404,6 +404,12 @@ disk_log_impl::request_eviction_until_offset(model::offset max_offset) {
         _eviction_monitor.reset();
 
         co_return model::next_offset(max_offset);
+    } else {
+        vlog(
+          gclog.debug,
+          "[{}] no segments to evict up to {} offset; skipping eviction",
+          config().ntp(),
+          max_offset);
     }
 
     co_return _start_offset;

tests/rptest/tests/full_disk_test.py

@@ -288,7 +288,7 @@ def observed_data_size(pred):
             return pred(observed_total)
 
         # write around 30 megabytes into the topic
-        produce_total_bytes(self.redpanda, self.topic, nbytes(30))
+        produce_total_bytes(self.redpanda, self.topic, nbytes(100))
 
         # wait until all that data shows up. add some fuzz factor to avoid
         # timeouts due to placement skew or other such issues.