Recommendations for improving read and seek times of BTRFS.
by David McFarland
Hi,
I have a question on recommendations for configuring BTRFS and opinions on if it is the correct filesystem to use for the following scenario at this time?
The system will have about 24TB of storage.
The minimal file size to be stored is 32KB and the maximum is 16GB.
We expect the mean distribution of files to be around 128KB-3MB.
We also expect that smaller files 3MB or less will be hit more frequently than the larger files.
The systems read performance is critical and our initial benchmarking with bonnie++ indicates BTRFS has poorer seek speeds and read performance than both XFS and EXT4.
My initial thoughts on this are to split the storage into a number of volumes, which will be optimised for file size ranges. i.e.
2 SSD for files 32KB – 256KB in size
5 HDD for files 256KB – 128MB in size
5 HDD for files 128MB – 16GB in size
Does this seem like a sensible approach? Is there any recommendations for optimising BTRFS with a focus on improving read performance and seek times for each of these ranges?
Thanks,
David
12 years, 7 months
kadischi post failed -- Reposted here -- iptables always started no matter what
by Phil Meyer
Please tolerate this post intended for the livecd-creator list. They
are bouncing me now days. Maybe its time I changed deodorant? I dunno ...
I am desperate!
---
livecd-tools-15.7-1.fc15.x86_64
Kickstarts all contain:
firewall --disabled
selinux --disabled
I even went as far as this:
%packages
---
[stuff deleted]
---
-system-config-firewall*
and
%post
---
[stuff deleted]
---
/sbin/chkconfig iptables off
/sbin/chkconfig ip6tables off
echo '#' > /etc/sysconfig/iptables
echo '#' > /etc/sysconfig/ip6tables
echo '#' > /etc/sysconfig/iptables-config
echo '#' > /etc/sysconfig/ip6tables-config
echo "#\n--disabled" > /etc/sysconfig/system-config-firewall
%end
What happens is that /etc/sysconfig/iptables, /etc/sysconfig/iptables,
and /etc/sysconfig/system-config-firewall ALWAYS get recreated AFTER
%post runs!
That causes the iptables kernel modules to load, and filtering started,
even though iptables is actually configured for off and does not start.
What is doing that? I cannot find it.
Any help is appreciated.
Thanks!
12 years, 7 months
Fedora 15 - boot menu
by Ronda Strauch
Hi, I'm trying to install Fedora 15 from a live CD, but the boot menu did
not appear so I could select "install a new system." Upon booting, a
message came up that my system didn't support GNOME 3 so it fellback. But
then it continued to a blue screen with Applications and Places in a user
menu. How do I get to an install window to load Fedora on the hard drive?
12 years, 7 months
proxy_ajp.conf removed
by solarflow99
Does anyone know why this was done? I can only see that it happened from
the httpd changelog, but no explanation anywhere, or how to create this
.conf file. It seems unwise to automatically load this module with no
config.
12 years, 7 months
Building X11R6.8 in Fedora 15 - Flex not found
by Doug Kuvaas
I am trying to build an older version of X Server on Fedora 15 to
allow me to run a legacy application. Fedora 8, which functions
correctly for our application, will not install on a new computer for
some reason, presumably because the new hardware uses UEFI, and Fedora
15 does not correctly run the application.
When I try to build X11R6.8 from source, I get the following error
"ld: cannot find -lfl". Doing some digging, I found that this error
is because the linker cannot find the flex library, however flex is
installed. I am running a minimal install of Fedora 15 i686 with the
dev libraries and tools installed, nothing else.
Kernel Version is 2.6.38.6-26.rc1.fc15.i686.PAE
Does anyone have any ideas on how to clear this error? All the
answers I found just said to install flex.
12 years, 7 months
Comparitive Desktop Environments
by Aaron Konstam
This morning I decided to try the various desktop environments available
to me, just to see how I react to each. Now nothing I am going to say is
designed to knock any particular environment. By now everyone knows I
have a number of complaints about Gnome 3.
So this morning I tried to get around in LXDE and KDE. I found I quickly
got lost in both. In LXDE I could not get LXTerm (I think that its name)
to be anything but transparent, rather than black letters on a white
background. I could never get any of the Background Images displayed in
the Background program to actually appear as backgrounds. I managed to
put Xterm in the Application menu but I could not get it as an option
in a panel. The way to shut down was fairly well hidden.
In KDE I also had problems. I could not find a way to get a Home
filesystem displayed so I could find a file I wanted to edit. I could
not get Rhythmbox to play . I had to use KsCD. Just now I found the
FileManagwer so scratch that problem. Once I found the FileManager I
found how to eject the Disk. A process that had eluded me for awhile.
Logging out and shutting down under Leave is as cute as the Gnome having
those options under the user name (+ Alt key), and equally obscure for
the first time user.
My point is all these DEs have things you can do which are hard to find
for the first time user. I may admit that Gnome 3 may be the most
obscure but not by much. In each case, some time must be spent initially
to figure out how to do things.
--
=======================================================================
The shortest distance between any two puns is a straight line.
=======================================================================
Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam(a)sbcglobal.net
12 years, 7 months
Upgrading to kde-4.7 on FC 14
by George R Goffe
Hi,
I'm trying to figure out how to upgrade to KDE-4.7 on my FC 14 system.
Could someone give me a hint/clue please?
Regards and thanks,
George...
"It's not what you know that hurts you, It's what you know that ain't so." Wil Rogers... Wil would say, "STIFF THE FED"!!!
12 years, 7 months
gdesklets
by Benjamin
Hallo everybody!
I have a question concerning gdesklets. I have installed ist and made a
nice profile for my desktop. But: Everytime i press the "Show desktop"
also the gdesklets disappear. Does someone know how to fix the desklets
on the desktop?
Version gdesklets:
0.36.3
fedora 15.
Thx. Benjamin.
12 years, 7 months
"wireless disabled in software"
by Timothy Murphy
WiFi on my Thinkpad T60 has stopped working recently.
I'm running Fedora-15/KDE.
When I hover over the NetworkManager icon in the panel
I read "Disconnected Wireless disabled in software"
I'm wondering who gives this message,
and what it means?
My WiFi card is Intel/PRO 3945ABG
The driver seems to be iwl3945.
I might mention that WiFi works fine on this machine
under Windows XP.
--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland
12 years, 7 months
