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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-API] Only 309 MB of RAM is showing out of 4GB
Hi Ananthan, ok, that sounds more appropriate :-) comes with a single hdd,but need to run 7 vms on it.So i believe sharing a single hdd among 7 vms and host machine simply adds disk i/o and can cause serious bottlenecks io is definitly the main bottleneck for common workload in virtualisation. ,to avoid that i thought of running vm on /dev/shm and take regular backups.i dont know whether i can do this with XCP,but i have done it with XEN by moving *.img* file to /dev/shm and starting vm from there. Once again thanks alot. if you don't want to invest in a good raid card with bbu (Areca rocks), you can still create a software raid with linux md and have decent performace. Software Raid cannot be setup at install time, but if you can add after first install (you first create the /dev/md0 with a few disks, and then define a storage repository on top). It not fully safe since there is no bbu and it does not deactivate hdd cache, but it should fine if you have manageable ups. one more thing: I believe your suggestion for memory is also applicable to hardisk also.since df -h is showing around 4 Gb. XCP creates a 4GiB partition for dom0 system, then an empty 4GiB partition (remnant of xenserver), and then create a big LVM partition (standard install), or a ext3 partition (if you chose thin provisioning during install), so extra disk space is just around the corner. Cheers, Denis PS : don't forget to respond to the mailing list Thanking You, Ananthan On Mon, Aug 13, 2012 at 5:43 PM, Denis Cardon <denis.cardon@xxxxxxxxxxxxxxxxxxxxxx <mailto:denis.cardon@xxxxxxxxxxxxxxxxxxxxxx>> wrote: Hi Ananthan, Thank you very much for clarifying my concern.But what i really want was to run all the Virtual Machine on shared memory /dev/shm (tmpfs).i have done it using xen by copying virtual image .img files to /dev/shm and started from there.But for doing that when i checked memory status i found this thing.is <http://thing.is> <http://thing.is> there a way to make the VM run on /dev/shm rather on HDD,to avoid i/o wait. you can increase the RAM of dom0 by changing the dom0_mem value in extlinux.conf and restarting your XCP server. However 4GiB is not a lot of ram and you won't have much room for putting both vm content and ram... Afterward, you will have to create a storage repository (xe sr-create) on /dev/shm to store your vdi there. I don't know if it works out of the box on ramdisk. Cheers, Denis PS : please, try to answer on the mailing list. On Mon, Aug 13, 2012 at 2:02 PM, Denis Cardon <denis.cardon@xxxxxxxxxxxxxxxxxxxxxxxx <mailto:denis.cardon@xxxxxxxxxxxxxxxxxxxxxx> <mailto:denis.cardon@xxxxxxxxxxxxxxxxxxxxxxxx <mailto:denis.cardon@xxxxxxxxxxxxxxxxxxxxxx>>> wrote: Hi Ananthan, installed XCP 1.1 on intel i5 second gen processor with 4 GB RAM but *top,free -m,cat /proc/meminfo* is showing only 309 mb of RAM space.... How can it be fixed.. dom0 memory is constrained by parameters in the extlinux boot param in/boot/extlinux.conf (look for the dom0_mem). Here in my conf below it is set to 752Mo, and it may vary after installation depending on the whole RAM of the server. cat /boot/extlinux.conf ... label xe # XCP kernel mboot.c32 append /boot/xen.gz dom0_mem=752M lowmem_emergency_pool=1M crashkernel=64M@32M console= vga=mode-0x0311 --- /boot/vmlinuz-2.6-xen root=LABEL=root-nddcwqei ro xencons=hvc console=hvc0 console=tty0 quiet vga=785 splash --- /boot/initrd-2.6-xen.img ... RAM used by dom0 is not available for virtual machines, it is used for network bridging and physical block device handling, etc. So it means that you have 4GiB - 300MiB of RAM available for your virtual machines. Cheers, Denis *ouput from xsconsole * *System Memory* Total memory 4096 MB Populated memory sockets 2 Total memory sockets 4 BIOS Information Version BLH6710H.86A.0119.2011.0523.____1030 Vendor Intel Corp *Processor Details* Logical CPUs 4 Populated CPU Sockets 1 Total CPU Sockets 1 *Description* x Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz *free -m* total used free shared buffers cached Mem: 309 284 24 0 6 116 -/+ buffers/cache: 161 147 Swap: 511 0 511 *top* Mem: 316416k total, 291956k used, 24460k free, 6644k buffers Swap: 524280k total, 0k used, 524280k free, 119156k cached *cat /proc/meminfo* MemTotal: 316416 kB MemFree: 24616 kB Buffers: 6584 kB Cached: 119072 kB SwapCached: 0 kB Active: 64236 kB Inactive: 100496 kB Active(anon): 38888 kB Inactive(anon): 5024 kB Active(file): 25348 kB Inactive(file): 95472 kB Unevictable: 6436 kB Mlocked: 6436 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 316416 kB LowFree: 24616 kB SwapTotal: 524280 kB SwapFree: 524280 kB Dirty: 532 kB Writeback: 0 kB AnonPages: 45544 kB Mapped: 18040 kB Shmem: 132 kB Slab: 18636 kB SReclaimable: 9612 kB SUnreclaim: 9024 kB KernelStack: 1520 kB PageTables: 0 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 682488 kB Committed_AS: 660896 kB VmallocTotal: 245752 kB VmallocUsed: 4576 kB VmallocChunk: 237148 kB DirectMap4k: 754492 kB DirectMap2M: 0 kB Regards, Ananthan, India This body part will be downloaded on demand. -- Denis Cardon Tranquil IT Systems 44 bvd des pas enchantés 44230 Saint Sébastien sur Loire tel : +33 (0) 2.40.97.57.57 <tel:%2B33%20%280%29%202.40.97.57.57> <tel:%2B33%20%280%29%202.40.__97.57.57> http://www.tranquil-it-____systems.fr <http://www.tranquil-it-__systems.fr> <http://www.tranquil-it-__systems.fr <http://www.tranquil-it-systems.fr>> -- Denis Cardon Tranquil IT Systems 44 bvd des pas enchantés 44230 Saint Sébastien sur Loire tel : +33 (0) 2.40.97.57.57 <tel:%2B33%20%280%29%202.40.97.57.57> http://www.tranquil-it-__systems.fr <http://www.tranquil-it-systems.fr> -- Denis Cardon Tranquil IT Systems 44 bvd des pas enchantés 44230 Saint Sébastien sur Loire tel : +33 (0) 2.40.97.57.57 http://www.tranquil-it-systems.fr _______________________________________________ Xen-api mailing list Xen-api@xxxxxxxxxxxxx http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api
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