Unstable output of FFSB (Filesystem benchmark)


 
Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers Unstable output of FFSB (Filesystem benchmark)
# 1  
Old 06-23-2016
Unstable output of FFSB (Filesystem benchmark)

I'm trying to benchmark a RAID-6 server using FFSB and the result is really unstable to detect the pattern.

Scenario -1:

Block-size - 65536 (64KB)
Number of threads - 10
Number of files - 10
Min and Max filesize - 400m
Read size - 400m
Direct IO - on
Random-read=off


Read throughput - 420MB/s (This is expected)


Scenario - 2:

Block-size - 65537 (64KB + 1 Byte)
Number of threads - 10
Number of files - 10
Min and Max filesize - 400m
Read size - 400m
Direct IO - on
Random-read=off

Read throughput - 30GB/s (this is not)


Can anyone explain this behaviour?
Login or Register to Ask a Question

Previous Thread | Next Thread

8 More Discussions You Might Find Interesting

1. AIX

Mount Filesystem in AIX Unable to read /etc/filesystem

Dear all, We are facing prolem when we are going to mount AIX filesystem, the system returned the following error 0506-307The AFopen call failed : A file or directory in the path name does not exist. But when we ls filesystems in the /etc/ directory it show -rw-r--r-- 0 root ... (2 Replies)
Discussion started by: m_raheelahmed
2 Replies

2. UNIX for Dummies Questions & Answers

hwo to find shared filesystem and local filesystem in AIX

Hi, I wanted to find out that in my database server which filesystems are shared storage and which filesystems are local. Like when I use df -k, it shows "filesystem" and "mounted on" but I want to know which one is shared and which one is local. Please tell me the commands which I can run... (2 Replies)
Discussion started by: kamranjalal
2 Replies

3. UNIX Benchmarks

unix benchmark thread?

Type: UltraSPARC IIIi 1,593 Mhz x2 Ram: 16G Disk: 2*70G fw scsi drives Load: db application kernel: Sunos5.10 pgms: compiled Sun cc -O2 ============================================================== BYTE UNIX Benchmarks (Version 3.11) System -- SunOS sun.spmbox.com 5.10... (2 Replies)
Discussion started by: mr_manny
2 Replies

4. UNIX Benchmarks

HP hardware benchmark

CPU: 1 x PA8600, 440MHz RAM: 1GB Hardware model: 9000/800/N4000-44 BYTE UNIX Benchmarks (Version 3.11) System -- HP-UX xxx B.11.11 U 9000/800 615379343 unlimited-user license Start Benchmark Run: Tue Apr 4 05:43:42 IST 2006 1 interactive users. Dhrystone 2 without register... (0 Replies)
Discussion started by: blowtorch
0 Replies

5. UNIX Benchmarks

Precompiled Benchmark software

Hi, Is there a precompiled binary for Solaris 8 available? I need to bench mark our Oracle server, as we are upgrading from SFv880 to SFv890. Both are fully loaded. I can't find a sun machine that I can compile the software on. Tks JohnHo (0 Replies)
Discussion started by: John Ho
0 Replies

6. Linux

Benchmark for Linux

I work in a computer company which sells computer configurations and parts of them. And I want to give a choice to customers. If they want to buy a PC with Linux installed, not Windows. But I find difficult to test the Graphic Cards in Linux OS. I have searched the web and I didn't found any... (2 Replies)
Discussion started by: vlatkop
2 Replies

7. UNIX Benchmarks

AMD-K5 Benchmark

AMD-K5 Processor at 133Mhz 32MB RAM 5 GB Hard Drive 10MB NIC 1MB ARC Graphics Card PS/1 Keyboard CD-ROM Floppy Drive Kickin' Fast BABY! hehe BYTE UNIX Benchmarks (Version 3.11) System -- FreeBSD evil-linux.net 5.0-RELEASE FreeBSD 5.0-RELEASE #0: Thu Jan 16 22:16:53 GMT 2003... (0 Replies)
Discussion started by: Phobos
0 Replies

8. UNIX Benchmarks

Ultra 10 benchmark

CPU/Speed: Ultrasparc IIi / 300MHz Ram: 128MB (Not enough) Motherboard: Sun Ultra 5/10 Bus: 4 PCI Cache: 512K Ecache Controller: Onboard IDE ATA/33 Disk: 40GB IBM ATA/100 Load: Low, 1 user, apache, samba, ipf, dtlogin disabled. Kernel: Solaris 5.10 b72 Kernel ELF?: yes pgms: I used the... (0 Replies)
Discussion started by: 98_1LE
0 Replies
Login or Register to Ask a Question
disktab(5)							File Formats Manual							disktab(5)

Name
       disktab - disk description file

Syntax
       #include <disktab.h>

Description
       The file is a simple data base that describes disk geometries and disk partition characteristics.  The format is patterned after the termi-
       nal data base.  Entries in consist of a number of fields separated by colons (:).  The first entry for each disk gives the names  that  are
       known for the disk, separated by vertical bars (|).  The last name given should be a long name fully identifying the disk.

       The following list indicates the normal values stored for each disk entry:
       Name Type Description
       ns   num  Number of sectors per track
       nt   num  Number of tracks per cylinder
       nc   num  Total number of cylinders on the disk
       ba   num  Block size for partition `a' (bytes)
       bd   num  Block size for partition `d' (bytes)
       be   num  Block size for partition `e' (bytes)
       bf   num  Block size for partition `f' (bytes)
       bg   num  Block size for partition `g' (bytes)
       bh   num  Block size for partition `h' (bytes)
       fa   num  Fragment size for partition `a' (bytes)
       fd   num  Fragment size for partition `d' (bytes)
       fe   num  Fragment size for partition `e' (bytes)
       ff   num  Fragment size for partition `f' (bytes)
       fg   num  Fragment size for partition `g' (bytes)
       fh   num  Fragment size for partition `h' (bytes)
       pa   num  Size of partition `a' in sectors
       pb   num  Size of partition `b' in sectors
       pc   num  Size of partition `c' in sectors
       pd   num  Size of partition `d' in sectors
       pe   num  Size of partition `e' in sectors
       pf   num  Size of partition `f' in sectors
       pg   num  Size of partition `g' in sectors
       ph   num  Size of partition `h' in sectors
       se   num  Sector size in bytes
       ty   str  Type of disk (e.g. removable, winchester)

       The entries can be automatically generated with the program.

Files
See Also
       chpt(8), newfs(8)

																	disktab(5)