06-02-2010
A typical computer system consists of one hard drive which uses only a single channel of communication to transfer data. On a RAID-0 system which uses multiple channels to transfer information, data is transferred twice as fast. This significantly increases data read and write speeds.
HTH
10 More Discussions You Might Find Interesting
1. IP Networking
For some reason 8.1 Mandrake Linux seems much slower than Windows 2000 with my cable modem. DSL reports test says they conferable speed with Windows2 though.
This is consistant slow with both of my boxes, at the same time. Linux used to be faster, but not with Mandrake. Any way to fix this? (17 Replies)
Discussion started by: lancest
17 Replies
2. Shell Programming and Scripting
Hi ,
I need to copy every day about 35GB of files from one file system to another.
Im using the cp command and its toke me about 25 min.
I also tried to use dd command but its toke much more.
Is there better option ?
Regards. (6 Replies)
Discussion started by: yoavbe
6 Replies
3. Solaris
friends,
Suppose I am typing metastat command and it is showing:
d100: Concat/Stripe
Size: 369495 blocks (180 MB)
Stripe 0: (interlace: 32 blocks)
Device Start Block Dbase Reloc
c1d0s0 16065 Yes Yes
c1d0s1 0 No Yes... (4 Replies)
Discussion started by: saagar
4 Replies
4. UNIX for Dummies Questions & Answers
i)wc -c/etc/passwd|awk'{print $1}'
ii)ls -al/etc/passwd|awk'{print $5}' (4 Replies)
Discussion started by: karthi_g
4 Replies
5. Linux
Hi,
I have the Lacie Big Disk, which is a external hard drive enclosure in a hardware RAID0 array of 2x250GB disks. The RAID controller seems to have died, leaving me with 2 working hard drives but no way to get the data. I tried hooking the drives up to a windows machine and using Raid... (4 Replies)
Discussion started by: dangral
4 Replies
6. UNIX for Advanced & Expert Users
Hi,
I have this mirrored system with soft-partitions.
I have a difficulty determining the lucreate cmd in this env.
#metastat -p
d0 -m d10 d20 1
d10 1 1 c1t2d0s0
d20 1 1 c1t3d0s0
d1 -m d11 d21 1
d11 1 1 c1t2d0s5
d21 1 1 c1t3d0s5
d100 -p d1 -o 58720384 -b 8388608
d200 -p d1 -o... (1 Reply)
Discussion started by: chaandana
1 Replies
7. UNIX for Dummies Questions & Answers
i'm trying to decide if to move operations from one of these hosts to the other. but i cant decide which one of them is the most powerful.
each host has 8 cpus.
HOSTA
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Intel(R) Xeon(R) CPU ... (6 Replies)
Discussion started by: SkySmart
6 Replies
8. Hardware
Hey all,
I've got an old HP9000 L1000 server with HP-UX installed. The drives that the OS is running on are in RAID0. I am concerned for the reliability of the server. The four hard drives in the front of the server are LVD 18.2 drives. I know with RAID0, if one drive fails, they all fail. ... (2 Replies)
Discussion started by: mroselli
2 Replies
9. Solaris
Hello all, this is my first time posting here. Where I work we have multiple servers (x3-2's) running Solaris 10u11 with 2 drives configured as RAID0, 300GB per. There are 4-6 open slots for drives to clone to.
Past attempts to clone/backup these drives has failed. One of the machines is... (1 Reply)
Discussion started by: eprlsguy
1 Replies
10. UNIX for Dummies Questions & Answers
Hi there,
I've setup a raid0 array of 3 identical disks using :
mdadm --create --verbose /dev/md0 --level=stripe --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1I'm using dstat to monitor the disk activity :
dstat --epoch -D sdb,sdc,sdd --disk-util 30The results show that the stress is not... (8 Replies)
Discussion started by: chebarbudo
8 Replies
LEARN ABOUT OPENDARWIN
fifo
fifo(3tcl) fifo(3tcl)
NAME
fifo - Create and manipulate u-turn fifo channels
SYNOPSIS
package require Tcl
package require memchan
fifo
DESCRIPTION
fifo creates a stream-oriented in-memory channel and returns its handle. There is no restriction on the ultimate size of the channel, it
will always grow as much as is necessary to accommodate the data written into it.
In contrast to the channels generated by memchan a channel created here effectively represents an U-turn. All data written into it
can be read out, but only in the same order. This also means that a fifo channel is not seekable.
The channels created here can be transferred between interpreters in the same thread and between threads, but only as a whole. It is
not possible to use them to create a bi- or unidirectional connection between two interpreters.
Memory channels created by fifo provide two read-only options which can be queried via the standard fconfigure command. These are
-length
The value of this option is the number of bytes currently stored in the queried memory channel.
-allocated
The value of this option is the number of bytes currently allocated by the queried memory channel. This number is at least as big as
the value of -length.
As the channels generated by fifo grow as necessary they are always writable. This means that a writable fileevent-handler will fire con-
tinuously.
The channels are also readable if they contain more than zero bytes. Under this conditions a readable fileevent-handler will fire continu-
ously.
NOTES
One possible application of memory channels created by memchan or fifo is as temporary storage device to collect data coming in over a pipe
or a socket. If part of the processing of the incoming data is to read and process header bytes or similar fifo are easier to use as they
do not require seeking back and forth to switch between the assimilation of headers at the beginning and writing new data at the end.
SEE ALSO
fifo2, memchan, null
KEYWORDS
channel, fifo, i/o, in-memory channel, memchan, stream
COPYRIGHT
Copyright (c) 1996-2003 Andreas Kupries <andreas_kupries@users.sourceforge.net>
Memory channels 2.1 fifo(3tcl)