The fragmentation tag has no wiki summary.
0
votes
2answers
93 views
Scientific data storage: many small files, one volume or several?
I have about 8 TB worth of 'sample' data with the following characteristics:
each sample: 5-15 GB in one folder containing ~20k files and ~10k subfolders (2000 top-level, 5 sub-level containing a ...
1
vote
3answers
73 views
Rebuilding the Management Studio Index in SQL Server 2005
Does anyone know if using the SQL Server Management Studio Index Rebuild, rebuilds the index online or offline?
Reading the help documentation doesn't say anything on this (so I would assume it is ...
0
votes
1answer
39 views
Fragmented packets on Red Hat Linux
Our application runs on Red Hat Linux 8.0 3.2-7, Linux kernel version 2.4.32.
We've found that the OS does not know how to handle fragmented packets. When receiving a large amount of fragmented ...
0
votes
0answers
98 views
Database fragmentation with PostgreSQL 8.1
I'v got a 220M db running under PgSQL 8.1 (upgrade not possible ATM.).
If I do a reindex, the db size goes to 220 but then it starts growing over time (it shoudln't), a few megs per day.
I did ...
3
votes
1answer
157 views
Is there a way of setting an MTU lower for traffic destined to a specific IP address on Cisco ASA?
I have a number of VPN sites where the MTU is lower than standard (1500). I have had at least one site where fragmentation of packets has had an effect on the success of building an IPSEC tunnel.
...
0
votes
1answer
82 views
(RFC-791) Application Layer PDU size, guaranteed to pass without fragmentation
I am writing a client-server python application, a part of which is using UDP Multicast to communicate. And my current concern is about fragmentation.
RFC 791 (page 24) says:
Every internet ...
6
votes
2answers
104 views
Can a tmpfs become fragmented?
Since a tmpfs exists only in memory, can it become fragmented like memory can? Are there mechanisms to automatically defragment the memory, and thus increase - even slightly - the access speed of ...
3
votes
3answers
452 views
What might prevent IKE handshake success in building an IPSEC tunnel?
We use Cisco ASA for our IPSEC VPNs, using the EZVPN method. From time to time we encounter problems where an ISP has made a change to their network and our VPN stops working. Nine times out of ten ...
2
votes
4answers
124 views
How accurate are Diskeeper's claims that fragmentation causes crashes, aborted bootups and other mayhem?
A white paper published by Diskeeper Corporation states at page 3 that,
The most common problems caused by file fragmentation are:
a) Crashes and system hangs/freezes
b) Slow boot up and ...
0
votes
1answer
101 views
how to do fragmentation attack via ubuntu machine
I wish to test my system which has snort installed on it.
I want to do fragmentation attack such as tiny fragment attack and wish that it should be logged by snort.
any suggestions? any graphical ...
1
vote
1answer
157 views
Index fragmentation and reorganizing database pages
Say you have a database with heavy index fragmentation. Say this database also has a lot of free space due to frequent deletes in its data file. This free space is not contiguous.
If I rebuild all ...
0
votes
2answers
252 views
How can Windows defragmentation tools cause internal fragmentation in SQL Server?
I was just reading this article where the author talks about the file system fragmentation that can be caused by growing database files. There was one bit that I didn't quite follow.
What about ...
3
votes
1answer
110 views
IPv4 Fragmentation over ethernet
I was under the assumption that fragmentation only happens at the router however this makes me wonder how datagrams get to the router without first being fragmented at the source to comply with the ...
1
vote
3answers
1k views
NETAPP Fragmentation
We all know that once a disk (or storage system for that matter) gets introduced into use, the performance degrades due to fragmentation of files. This seems to be why disk defragmentors are in ...
4
votes
4answers
1k views
Does Windows Defrag utility reports fragmentation correctly on a RAID system?
We have a server with a RAID volume. Windows DEFRAG shows very high fragmentation (90%) on the volume. My chief asked if DEFRAG reported fragmentation is correct (or near correct) or not.
We don't ...
4
votes
2answers
397 views
What is the equivalent of Cisco's 'ip virtual-reassembly' for a Juniper ISG 2000
I tested my dns servers with the oarc test and my size limit is at least 1403 bytes. I performed the same test before my Juniper ISG 2000 and the result is 2047 bytes.
According to the chapter IP ...
3
votes
3answers
623 views
Could MFT fragmentation be a problem on my busy file server?
Windows Server 2003 SP2
LUN mounted from SAN
Millions of small files across hundreds of thousands of directories (100GB total)
NTFS with 4k cluster size
While doing the initial file crawl for backups ...
0
votes
2answers
210 views
Why can't I rebuild some SQL Server indices?
I've got a table in my SQL Server 2005 database with two indices that are heavily fragmented (33.3% and 85.7%). The table looks like the following:
CREATE TABLE [dbo].[Seasons](
[SeasonID] ...
1
vote
1answer
434 views
How is Win32_DefragAnalysis FilePercentFragmentation Calculated
SCOM 2007 R2 added a fragmentation analsysis health check that is producing warnings on many of my servers. To try to understand how SCOM is determines the fragmentation level, I created the following ...
0
votes
1answer
85 views
Is there a way to determine fragmentation statistics about a single file on Win2003?
Basically, I don't care about fragmentation on the disk as a whole, I'm just curious about one file in particular... in my case, a SQL database and transaction log file. I'm looking for something ...
2
votes
2answers
535 views
How can I deliberately fragment specific files? (NTFS)
This may have been asked but...
I'm trying to profile the impact of file fragmentation on one of our business applications. What's the easiest and cleanest way to cause a 20GB file to fragment into ...
3
votes
8answers
979 views
Swap file fragmentation: fact or fiction?
This is about Windows, but I'm sure it applies to other OS as well.
I've heard people say that if you want better performance, you should avoid swap file fragmentation. To do this, you can either ...
1
vote
1answer
353 views
FTP Client upload: preallocate file before starting the transfer
I'd like to limit server disk fragmentation when multiple clients upload to an FTP server simultaneously.
Is there a way to tell FTP server to preallocate disk space for a big block of an incoming ...
11
votes
6answers
3k views
SQL Database physical file fragmentation
I know that there are really three kinds of fragmentation that I need to be concerned about as a DBA:
Index Fragmentation in the SQL data files, including clustered index (table) fragmentation. ...
