A computer components & hardware forum. HardwareBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » HardwareBanter forum » General Hardware & Peripherals » Storage & Hardrives
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

performance degradation backing up small files



 
 
Thread Tools Display Modes
  #1  
Old April 26th 04, 10:23 PM
alan
external usenet poster
 
Posts: n/a
Default performance degradation backing up small files

Has anyone experienced performance degradation when backing up large
volumes of files from a NAS array? I am researching complaints that
backing up large volumes of small files (128k)results in a noticeable
performance drop. One suggested solution was to segregate small files
and back them up over the LAN rather than the SAN. Does this make
sense?

Thanks,
Alan
  #2  
Old April 26th 04, 10:45 PM
Rob Turk
external usenet poster
 
Posts: n/a
Default

"alan" wrote in message
m...
Has anyone experienced performance degradation when backing up large
volumes of files from a NAS array? I am researching complaints that
backing up large volumes of small files (128k)results in a noticeable
performance drop. One suggested solution was to segregate small files
and back them up over the LAN rather than the SAN. Does this make
sense?

Thanks,
Alan


First step is to find out where the bottleneck is. With large numbers of
small files, maybe the disks are overwhelmed by seek requests. More often
the backup software has a bottleneck keeping track of all those small
transactions in the index database.

Measure disk I/O on the NAS, and on the backup server. Find out where the
bottleneck is. Once you find that out, it's time to talk about possible
fixes.

Rob


  #3  
Old April 27th 04, 05:47 AM
Al Dykes
external usenet poster
 
Posts: n/a
Default

In article ,
alan wrote:
Has anyone experienced performance degradation when backing up large
volumes of files from a NAS array? I am researching complaints that
backing up large volumes of small files (128k)results in a noticeable
performance drop. One suggested solution was to segregate small files
and back them up over the LAN rather than the SAN. Does this make
sense?

Thanks,
Alan



Is this thru an ethernet switch ? FWIW I once saw a _very_ strange
problem that sort of fit your description. After eliminating lots of
things, I sort of narrowed it down to the switch (an otherwise
excellent HP procurve box in use for a year.) A call to HP support
told me quickly that it was a "known problem" and that I should reboot
the swicth. If the problem reoccured there was a microcode update
avaiable.

FWIW

--
Al Dykes
-----------
adykes at p a n i x . c o m
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Implementing a RAID System Chris Guimbellot General 33 February 3rd 05 10:43 AM
novice asks - Installing a scanner John McGaw General 8 September 20th 04 05:19 PM
my new mobo o/c's great rockerrock Overclocking AMD Processors 9 June 30th 04 08:17 PM
Strange files saved the hard disk SunMyoung Yoon General 1 January 3rd 04 05:44 AM
Using cabs files to make an installation CD KILOWATT General 2 September 8th 03 10:11 PM


All times are GMT +1. The time now is 12:58 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 HardwareBanter.
The comments are property of their posters.