Server :: PAE Kernel (2.6.18) Fails To Swap With Large Amounts Of Physical Ram?
Dec 8, 2009
We're load testing some of our larger servers (16GB+ RAM), and when memory starts to run low they are kicking off the oomkiller instead of swapping. I've checked swapon -s (which says we're using 0 bytes out of 16GB of swap), I've checked swappiness (60), I've tried upping the swap to 32GB, all to no avail. If we pull some RAM, and configure the box with 8GB of physical ram and 16 (or more) GB of swap, sure enough it dips into it and is more stable than a 16GB box with 16 or 32GB of swap.
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Feb 15, 2011
we've been trying to become a bit more serious about backup. It seems the better way to do MySQL backup is to use the binlog. However, that binlog is huge! We seem to produce something like 10Gb per month. I'd like to copy the backup to somewhere off the server as I don't feel like there is much to be gained by just copying it to somewhere else on the server. I recently made a full backup which after compression amounted to 2.5Gb and took me 6.5 hours to copy to my own computer ... So that solution doesn't seem practical for the binlog backup.Should we rent another server somewhere? Is it possible to find a server like that really cheap? Or is there some other solution? What are other people's MySQL backup practices?
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Mar 6, 2010
I am trying to move a large amount of files (over 30k and 86GB) to another HDD but I get a Augment list too large error?? I tried rsync, cp, mv and still the same error
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Jun 20, 2010
Why linux uses swap space, even if there are free physical memory available.
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Oct 27, 2010
I've been using GIMP's 'save for the web' tool to reduce the file sizes of images.
I now have a directory with about 50 images. I'd like to avoid processing them all by hand.
I have a (very) basic knowledge of programming, and I'm comfortable with the commandline. I don't mind doing some homework on how to use new tools.
All I'm really concerned with here is reducing the file sizes of the images I have.
What possible pathways are there for me to prepare large amounts of images for the web?
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Dec 20, 2009
i have a car stereo that reads a USB drive with all my music on it, however to sort through the music it uses a method of finding folders containing music, then displaying them all in a list. i find this interface annoying because in order to sort the music by artist i have to go and manually move it out of the album folders by hand, this takes a long time for 11+ GB of music so i was trying to use the linux CLI to quicken the process. use a command like this
Code:
mv /media/usb/music/*/*/* /media/usb/music/*/
but for some reason this moves all my music into the last folder alphabetically in my drive, the music is all pre-arranged like this /media/usb/music/artist/album/song
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Sep 1, 2009
Are there any tools out there that let me select a bunch of data and burn it to multiple cd's or DVD's? I'm using k3b but have to manually select cd and dvd size amounts.
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Oct 20, 2010
I am monitoring physical memory in a server I administer, and my hardware provider told me they had increased physical memory size to 4Gb... However, using several tools (free -m; top; dmesg | grep Memory; grep MemTotal /proc/meminfo I discovered that I actually have 3Gb, not 4... But, my doubt comes from the fact that dmesg | grem Memory tells me I have 3103396k/4194304k available The first number is effectively 3Gb, but the second one, is 4! so, why I am looking at this two different numbers?
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Apr 25, 2010
I am running Debian Lenny 2.6.26-2-amd64 and I have the following setup:
3 Raid6-Volumes each 19TB size (md0,md1,md2)
I would like to join the three of them to one large LV (of 57TB) formatted with a jfs fs.
I installed:
jfs_mkfs version 1.1.14, 06-Apr-2009
lvm version
LVM version: 2.02.39 (2008-06-27)
Library version: 1.02.27 (2008-06-25)
Driver version: 4.13.0
Prerequisite: the md are assembled and have synched:
Code:
cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] .....
I used jfs_mkfs on each of the three mds and mounted the drives to run some checks and they worked without a problem. I am pretty sure the drives/raids are OK. Then I created the VG "pod" with the three drives as members: .....
Then I created a 40TB LV for testing
Code:
lvcreate -L 40T pod
which gave me this
Code:
lvscan
ACTIVE '/dev/pod/lvol0' [40.00 TB] inherit
Then I went on formatting the drive using
Code:
jfs_mkfs /dev/pod/lvol0
Still - everything fine.
When trying to check the partition with jfs_fsck I get:
Code:
ujfs_rw_diskblocks: disk_count is 0
Unrecoverable error writing M to /dev/pod/lvol0. Cannot Continue.
The really funny thing is that I don't seem to get the error if I try to run the thing with a 25TB LV everything looks fine: There is nothing in syslog that would point to the source of this error. Also - if I try to mount the 40TB partition, everything is fine - but when I try to write to it, the whole system hangs and there is no way to recover.
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Sep 12, 2010
When we want to setup a linux system, there is a common a suggestion like set the swap space as twice as big than your physical memory, I want to know why do we need this and how is this suggestion come from?
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Oct 24, 2010
I have a system with 2G of memory and swap memory of 4G.
This is the output from :
PHP Code:
How could they do to the memory cache to be used as much? Because, occasionally, swap is used and note that the system could use the memory cache does not swap ...
Slackware current 64 multilib.
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Aug 31, 2010
Just wanted to see if any one had this experience? I just did a fresh install of the recent LTS and saw it made a whopping 8 1/2 gig swap on a new pc I have 3 gigs of ram in? Im a try to resize as I have already done my customizing to it.
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Sep 21, 2010
The following is a subset of error messages I'm getting when trying to do "apt-get upgrade" or "apt-get dist-upgrade" on a machine running ubuntu server 9.10 amd64:
Code:
Preparing to replace linux-image-2.6.31-22-server 2.6.31-22.60 (using .../linux-image-2.6.31-22-server_2.6.31-22.65_amd64.deb) ...
[code]....
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Feb 3, 2010
I am programmatically doing a large FTP upload (about 5 Gb's of 2-3 Mb files) from my Windows 7 machine to a ProFTPd server on my Ubuntu box. When the program is run, transfer rates are huge! but as run time continues, transfer rates drop off significantly and eventually slow to a halt resulting in a:
Quote:
Read Timed Out
error.
The rest of the uploads fail due to Socket Read Errors.
Why is the transfer failing like this?
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Oct 15, 2010
My MySQL replication slave failed,while reading a large size table from master.Thhe information from error.logError 'Unknown table engine 'InnoDB'' on query. Default database: 'test'. Query: I am sure that table is a Big size table..
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Sep 10, 2010
Maybe what I am trying to do doesn't work but let me explain. I have two identical drives on my PC.
/dev/sda = 1 TB
/dev/sdb = 1 TB
I wanted to mirror the drives so I created two separate partitions on each drive:
sda1 = 1024 MB (Swap)
sda2 = 999 GB (Software RAID)
sdb1 = 1024 (Swap)
sdb2 = 999 GB (Software RAID)
I then only created /dev/md0 which consist of /dev/sda2 & /dev/sdb2 in RAID 1 mirror.
When I boot the system, I show that Swap fails during boot in bright 'red' letters. I don't know if it failed activating both or just any swap partitions in general. When I look at 'df -h' while my system is booted, I show:
Code:
[root@buster ~]# df -h
Filesystem Size Used Avail Use% Mounted on
udev 10M 168K 9.9M 2% /dev
/dev/md0 997G 847M 992G 1% /
shm 997M 0 997M 0% /dev/shm
Does this mean that only 1 swap partition activated successfully and the 2nd one failed? Should I mirror the two swap partitions into /dev/md1?
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Jul 13, 2010
After updating to kernel-2.6.33.6-147.fc13.i686, my email (Thunderbird) fails to connect to the pop-server, and webpages (Firefox) load VERY slow, if at all.When I go back to kernel-2.6.33.3-85.fc13.i686, I have no problem at all.Network chipset: RTL8180
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Nov 4, 2010
As i undertsand - out of 1GB of the virtual Address space for Kernel from 3GB to 4GB of the process address space, Kernel image (code, data, bss, stack, heap) resides staring @0x0 address. Vmalloc area starts either at the end of Physical ram size or at 896M. This 896M cap is mandated to ensure that minimum of 128MB is reserved as vmalloc_reserve for vmalloc,kmap etc.
Is the understanding correct? Now trying to map Physical Zones into this 1GB address space
Initial 16MB is mapped to ZONE_DMA
16MB - 896MB is mapped to ZONE_NORMAL
896MB - 1024MB is mapped to ZONE_HIGHMEM
Does this mean that Kernel image is residing in ZONE_DMA area? Any call to vmalloc() in kernel code will return address beyond 896M? insmod of any LKM will internally invoke vmalloc() to obtain contiguous area - where will this code physically located along with rest of kernel code in ZONE_DMA or in ZONE_HIGHMEM?
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Dec 1, 2010
I just installed kernel 2.6.37-rc3-natty in an effort to clear up the audio stuttering problems prevalent in Maverick. It worked, but now my swap partition won't mount on startup and because of this the computer won't hibernate. I'm using a Toshiba NB305-400 netbook w/1GB of ram, 250GB HDD and 1.6 GHz processor.Here's what's in my fstab file:Quote:
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda1 during installation
[code]....
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Feb 11, 2011
This may seem like a silly question but I have many servers and sometimes we forget when we login if it physical or virtual running on a VMware system. This makes a diffrence when I try to get a console access etc. So I wanted to know before if its physical or VM.yes I know i can change motd once i get the info or make a list etc. There are many ways not OS related for me to find this info out. But I was wondering if there was a Linux command that I could use when I ssh to a system to check if its physical or logical?I have inventory information etc and vm vsphere to check but that can be time consuming if I just want to check something quick.
uname -a or something like that that would tell me would be cool. I am thinking there is no command as Linux really does not care if its running Vm or physical.
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Feb 3, 2011
We have 2 servers, 1 is the webserver and the other is the Mysql server.
When transfering a 2GB file from the webserver to the Mysql server.
The webserver's connection to the mysql DB server dies completely.
Need to restart the MYSQL process in order for it to come back online.
During this connection downtime, when using phpmyadmin on the mysql server shows no problem running queries etc.
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Mar 9, 2011
I am trying to figure out the "actual" disk size used by my system. When I run the "df -h" command,I am not taking here into consideration the shared memory of 2Gb as it is a sort of virtual shared memory and is not allocated physically. Is that correct ?
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Aug 30, 2010
I got the VMrss used by a process as about 2GB, but the physical memory of my computer is only 1G.
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Jan 21, 2011
I'm new to setting up Linux Servers. I've setup a Ubuntu 10.10 Server along with CUPS and I'm using Webmin to talk to the server. I have a HP PSC 1315 Multifunction printer connected via usb to the server. Using the CUPS web interface I am able to get the server to detect the connected printer and it identified the HP PSC 1310 Series drivers.
When I printer a test page from the server's screen the print job goes through ok and the size was about 5k.
I then setup a samba share to allow my Windows 7 machine to share the printer. Windows 7 is able to pick up the shared printer correctly and I used the default HP 1310 Series drivers. When I tried to send a test page to the printer, that single page ended up being 3887kb and I also tried printing out a single paged word document which ended up being over 7MB.
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Mar 29, 2010
I have a 14TB raid, file system is read-only and I am trying to run e2fsck -B -p -C -v -y /dev/sdb1, it goes through, but fails and says bad block/inode or fails to transfer, something like that.Is there a way I can get this to run successful, this is a production storage server, its critical.
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Nov 28, 2010
I'm trying to design an inexpensive large scale DNS server but fail to find any metrics or methods to base scalabilty.Can anyone offer information on building a stable dedicated DNS server? That might be able to scale well.
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Jan 2, 2011
Before running SOSreport, the free physical memory is 5389Mb out of 8Gb.
After running SOSreport, the free physical memory is 3229Mb.
Why is this so? how we can free up the physical memory.
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Jul 5, 2011
I have a 7.9 TB logical volume I've created from 8 1 TB RAID 0 devices. The volume is formatted with XFS so I can resize when ready. However, I think I want to do something that is not possible. I have 2.5 TB free on my logical volume. I'd like to shrink the volume down to be 6 TB by getting rid of 2 of the 1 TB devices in the physical volume. However pvmove seems to require free extents in order to work. Do I need to add 6 TB of storage, pvmove everything onto it, and then decommission the original 8 1 TB physical devices from the volume?
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Oct 19, 2009
Is there some way that I can use apache/iptables to serve both of my servers through the same basic domain? I'm not talking about VirtualHosts either, I don't believe ( despite the fact that's all I can find anything to read about on Google when searching for this ).
Anyway, the problem is that I have a TorrentFlux php torrent-client that I run so I can add stuff to the download when I'm not around. I don't want to put this on my regular webpage server because there's just not enough diskspace in that machine. On the other hand, I don't want to replace that server all-together because the other machine is my desktop and would not make a reliable host.
So my idea was that there could be some way to have the apache2 server on my dedicated server redirect a subdirectory in its webroot to the webroot of my desktop's TorrentFlux server, but over standard HTTP ports so that it is more like the server is serving up the content of my desktop server through its HTTP service, instead of simply redirecting.
The reason I want to do this is because so far I have to use the TorrentFlux server on a nonstandard port so my dedicated server can still host its own things on port 80, but I've been running into several situations where the browsers I want to use do not support the nonstandard port such as with some instances of IE or the browser on my BlackBerry.
Anyway, I'm not looking for a step by step or anything ( though it couldn't hurt ) but I just need some ideas on what I could search for to get some better ideas. There's probably some term for what I want to do I'm not even aware of that would help me greatly.
Runnining Ubuntu 7.04 and apache 2.2.4 along with shorewall 4.0 as my routing/firewall software.
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Sep 19, 2010
I had a problem with the install of Ubuntu 10.04 and 10.04.1 on a Dell Precision T3500. I used the 32bit live CD. I let the installer create the file systems and use the whole disc. The disc is was created as shown below. After the install button was pressed, the root file system was created and then the swap. When the installer went to mount the swap it complained there was not enough memory and failed the installation. I installed Ubuntu by manually making the swap file system smaller using gparted and assigning the / and swap to the file systems created by gparted.
Disk /dev/sda: 250.0 GB, 250000000000 bytes
255 heads, 63 sectors/track, 30394 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[code]...
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