`storageperf` tests fail with default time limits on `h3` instances due to disk speed limitations

From https://cloud.google.com/compute/docs/compute-optimized-machines#h3_limitations > Persistent Disk and Google Cloud Hyperdisk performance is capped at 15,000 IOPS and 240 MBps throughput. This means the initial fio file write takes about an hour to complete (500GB @ 240MB/s) before the real tests even begin. With the default timeout of 20m, the storageperf tests for `h3` instances will always time out. I think a good solution would be write a smaller amount of data for h3 instances, perhaps 20 or 50G instead of 500 for the initial pre-test write. ``` root 82318 0.0 0.0 1244224 23324 ? Sl 14:45 0:00 \_ /etc/image_test2047922026/image_test -test.v -test.timeout 60m -test.run TestRandomReadIOPS|TestSequentialReadIOPS|TestRandomWriteIOPS|TestSequentialWriteIOPS root 82516 0.4 0.0 239496 4928 ? Sl 14:46 0:08 \_ fio --name=fill_disk --direct=1 --verify=0 --randrepeat=0 --bs=128K --iodepth=64 --rw=randwrite --iodepth_batch_submit=64 --iodepth_batch_complete_max=64 --ioengine=libaio --filesize=500G --filename=/dev/nvme0n2 root 82686 3.5 0.0 182592 9564 ? Ss 14:46 1:01 \_ fio --name=fill_disk --direct=1 --verify=0 --randrepeat=0 --bs=128K --iodepth=64 --rw=randwrite --iodepth_batch_submit=64 --iodepth_batch_complete_max=64 --ioengine=libaio --filesize=500G --filename=/dev/nvme0n2 ``` ``` [root@h3standard88pdbalanced-storageperf-6j2t8 jonathan]# iostat -x 2 Linux 5.14.0-570.49.1.el9_6.x86_64 (h3standard88pdbalanced-storageperf-6j2t8) 10/01/2025 _x86_64_ (88 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.02 0.00 0.04 0.00 0.00 99.94 Device r/s rkB/s rrqm/s %rrqm r_await rareq-sz w/s wkB/s wrqm/s %wrqm w_await wareq-sz d/s dkB/s drqm/s %drqm d_await dareq-sz f/s f_await aqu-sz %util nvme0n1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 nvme0n2 0.00 0.00 0.00 0.00 0.00 0.00 1920.00 245760.00 0.00 0.00 33.30 128.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 63.94 100.0 ```