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Questions tagged [fragmentation]

File system fragmentation is the inability of a file system to lay out related data sequentially (contiguously), an inherent phenomenon in storage-backed file systems that allow in-place modification of their contents.

In computing, file system fragmentation, sometimes called file system aging, is the inability of a file system to lay out related data sequentially (contiguously), an inherent phenomenon in storage-backed file systems that allow in-place modification of their contents.

File system fragmentation increases disk head movement or seeks, which are known to hinder throughput.

Source: wikipedia

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Rebuilt nonclustered indexes quickly get fragmented again

I've got a couple of nonclustered indexes on tables that have rows inserted quite often. These indexes are currently around 90% fragmented, according to SQL Server. If I rebuild them, they go down to ~5% fragmentation but they quickly get back up to…
thecoop
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Can someone give me advice on these rules to prevent DDOS where fragmented packets are sent without the initial SYN fragment ?

iptables -N NEW_TCP_PACKETS_NO_SYN iptables -A INPUT NEW_TCP_PACKETS_NO_SYN -p tcp ! --syn -m state --state NEW -m limit --limit 10/day -j LOG --log-prefix "New packets but not syn:" iptables -A INPUT NEW_TCP_PACKETS_NO_SYN -p tcp ! --syn -m…
Kris
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Mysql 5.5 Defragmentation not reducing the fragmentation percent

We are running OPTIMIZE TABLE , but not seeing any fragmentation reduction. They are as high as 120% to 200%. Am calculating the fragmentation % using this: Data_Free / (Data_Length + Index_Length) My tables are using INNODB engine and …
Abhishek Ravi
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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 file, and to keep incrementing in big…
GregC
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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 ~.5-2MB data files and small settings files). I am…
Isaiah
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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 offline) but I would like to know, as I prefer using…
Dina
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(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 module must be able to forward a datagram of 68…
athspk
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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 indexes to remove fragmentation and then reorganize…
TiQ
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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 fairly wide use on Windows boxes. And they do…
mdpc
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how to set mtu on specfic udp connection?

is there iptables target to fragment packets, let say i have packet with length 1280 i want to split this packet into smaller 5 packets with maximum length equal 250 , is it possible to use firewall in linux (nftables, iptables) to fragment packet…
Hosni
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Packet fragmentation confusion

I was playing around with dpkt in Python, trying to decode PPPoE - and the program was working just fine, till I noticed that the Offset in the encapsulation IP packets was always 0, even with clearly fragmented packets. As can be seen, the server…
jcoppens
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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 that will provide very basic statistics - number of…
Michael Bray
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Windows Server 2012 R2 : Drive C: gets fragmented very quickly

We are running Windows Server 2012 R2 with the Hyper-V role installed. I have discovered that the host's volume C: get's fragmented very quickly (about 4% in only 1h). Our SCOM configuration triggers an alarm after hitting 25% fragmentation - and…
Matthias Güntert
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Fragmentation and packet size,using tcpdump

i am trying to understand concept of fragmentation: i have two virtual machines with public ip connected to a switch. tracepath shows packet not going through gateway from vm1: Trying to send icmp with 65507 bytes to vm2. ping -M want -s 65507…
Kevin Parker
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How to prevent file fragmenting when you are creating archive

i have a test environment with subversion, im making DUMP files (20GB) and then compressing it. It gives me 12GB file, but with over 500 fragments. Question is, is there a way to archive file into one file-piece? 7-zip, winrar or anything? Thanks
Alex
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