This document summarizes the status of the ongoing JFS 1.x test effort of the IBM Linux Technology Center Test Team. It includes the test approach, unresolved issues, environment, test cases, and some observations of JFS 1.x and identifies areas where additional testing could be useful. Unless otherwise indicated, only results from the latest JFS versions are given.
Focus tests including dbench, cerberus, bonnie++, iozone, fs_inod, linktest, lftest, fs_maim and postmark are run on 2-way machines for each JFS drop. These tests are run to verify the basic functionality and stability of the code and are usually of short duration (<24 hours). Stress tests include 72+ hour runs of dbench, cerberus and/or bonnie++ and are usually run after focus tests are done. Integration runs typically involve JFS in an enterprise environment with DB2 or Oracle, WebSphere and EVMS.
There are no unresolved issues at this point in the test effort.
As new features (such as logging outside the volume, extending the filesystem and defragmentation) are made available, new tests should be developed to verify the added functionality.
This section details the distributions, and kernel versions, and defines the hardware configurations used during testing.
Initial test efforts focused on commercially available distributions. The LTC is continually evaluating its test environment and may add additional distributions in the future. The distributions and releases for the test effort were as follows:
| Name | Processor | Memory | Storage |
|---|---|---|---|
| Test1 | (2) P3-550MHz | 2Gb | (3) 17Gb |
| Test2 | (4) P3-700 MHz Xeon | 2Gb | (6) 18Gb |
| Test3 | (8) P3-700 MHz | 10Gb | (2) 35Gb |
| Test4 | (8) P3-700 MHz | 10Gb | (2) 35Gb+5.2Tb SAN |
| Location: | http://ltp.sourceforge.net |
| Description: | lftest is a tool/test designed to create large files and lseek from the beginning of the file to the end of the file after each block write. This test verifies large file support and can be used to generate large files for other filesystem tests. |
| Target Test Duration: | 60+ hours or until target filesize is reached |
| Average Test Duration: | N/A |
| Hardware: | Test4 |
| Kernels: | 2.4.17+jfs-1.0.14 and 2.4.18+jfs-1.0.15 |
| Distributions: | SuSE 7.3 |
| Parameters: | lftest 1958976 (should fill a 1.9 Tb JFS volume) |
| Observations: | The JFS filesystem was created with mkfs.jfs and reported a size of 2005991424 1-k blocks. lftest was started with the size parameter of 1958976 blocks. A single large file(1.9Tb) was created that completely filled the volume. |
| Location: | http://ltp.sourceforge.net |
| Description: | shortpart is a subset of fs_maim. it performs: mount, create a file, umount and fsck X number of times in rapid succession |
| Target Test Duration: | iterative |
| Average Test Duration: | almost 15 hours |
| Hardware: | Test1 |
| Kernels: | 2.4.17+jfs-1.0.14 |
| Distributions: | SuSE 7.3 |
| Parameters: | shortpart 100000 (mount, create a file, umount and fsck, 100000 times in rapid succession) |
| Observations: | The JFS volume handled the filesystem utility abuse without corruption. Test completed without any errors. |
| Location: | http://ltp.sourceforge.net |
| Description: |
Linux Test Project Suite is an all-around suite with some good filesystem and I/O tests. |
| Target Test Duration: |
96 hours |
| Average Test Duration: |
96 hours |
| Hardware: |
Test2 |
| Kernels: | 2.4.18+jfs-1.0.15 |
| Distributions: | SuSE 7.3 |
| Parameters: |
N/A |
| Observations: |
Test completed without any filesystem errors. |
| Location: |
http://sourceforge.net/projects/va-ctcs
|
| Description: |
A Test Control System with stressful tests for hardware burn-in. Good all around filesystems tests. |
| Target Test Duration: |
60 hours |
| Average Test Duration: |
60 hours |
| Hardware: |
Test1, Test2 |
| Kernels: |
2.4.18+jfs-1.0.16 |
| Distributions: | SuSE 7.3 |
| Parameters: |
newburn |
| Observations: |
Test completed without any filesystem errors. |
| Location: |
http://www.netapp.com/tech_library/postmark.html
|
| Description: |
Filesystem benchmark that simulates load generated by enterprise applications such as email, news and web-based commerce. |
| Target Test Duration: |
variable (dependent on size parameters and number of iterations) |
| Average Test Duration: |
typically >12 hours |
| Hardware: |
Test1 |
| Kernels: |
2.4.18+jfs-1.0.16 |
| Distributions: | SuSE 7.3 |
| Parameters: |
set size 1000 20000 set number 500000 set seed 42 set transactions 50000 set read 15000 set write 10000 set buffering false |
| Observations: |
Test completed without any filesystem errors. |
| Location: |
http://www.iozone.org
|
| Description: |
Filesystem benchmark tool (read, write, re-read, re-write, read backwards, read strided, fread, fwrite, random read, pread, aio_read, aio_write) |
| Target Test Duration: |
24 hours |
| Average Test Duration: |
24 hours |
| Hardware: |
Test1 |
| Kernels: |
2.4.18+jfs-1.0.16 |
| Distributions: | SuSE 7.3 |
| Parameters: |
IOZone -A (16 iterations) |
| Observations: |
Test completed without any filesystem errors. |
| Location: |
ftp://samba.org/pub/tridge/dbench/
|
| Description: |
Filesystem benchmark that generates good filesystem
load |
| Target Test Duration: |
.5 hour(s) |
| Average Test Duration: |
22 minutes |
| Hardware: |
Test1 |
| Kernels: |
2.4.18+jfs-1.0.16 |
| Distributions: | SuSE 7.3 |
| Parameters: |
dbench is run in a loop, adding 1 client on each iteration,
usually up to 10 clients. |
| Observations: |
Test completed without any filesystem errors. |
| Location: |
N/A |
| Description: |
Cycle the power on the machine while writing to a jfs volume (usually using dbench or bonnie++). Bring the machine back up mounting the jfs volume. |
| Target Test Duration: |
N/A |
| Average Test Duration: |
N/A |
| Hardware: |
Test1, Test2 |
| Kernels: |
Latest: 2.4.18+jfs-1.0.16 |
| Distributions: | SuSE 7.3 |
| Parameters: |
N/A |
| Observations: |
fsck.jfs caught errors, log was replayed and volume was not corrupted. The jfs volume was then mounted without error. |
| Last modified on: August 02, 2006 - 10:13:16 PDT. |