| --- | Log | opened Wed Oct 13 00:00:42 2010 |
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| 06:56 | <bibekp> | hi. i want to copy an existing VM and do some testing stuffs on the newly created machine. any pointers that help in this task will be very helpful. thanks |
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| 09:07 | <xmerlin> | bibekp, what you are using to store images ...file / logical volumes / drbd ...? |
| 09:10 | <bibekp> | xmerlin, i am working on a system that was administered by somebody else. filesystems are mounted in this way: "phy:/dev/sda5,sda1,w" . i dont think that answers your question. how can i find how they are stored? |
| 09:11 | <xmerlin> | bibekp, you are using a physical partition |
| 09:11 | <bibekp> | xmerlin, ie files. right? |
| 09:11 | <xmerlin> | no |
| 09:11 | <xmerlin> | partition |
| 09:12 | <xmerlin> | you can: 1- stop vm, 2- clone the partion (...you can create a disk image ...for your tests), 3- change conf to bring up the file .---4 test... |
| 09:13 | <xmerlin> | to clone the partition you can do a simple dd if=/dev/sda5 of=/somewhere/vm.img bs=4M |
| 09:14 | <bibekp> | xmerlin, ok. thanks |
| 09:14 | <bibekp> | xmerlin, but there are other partitions than sda5 too. should i create images for all of them? |
| 09:15 | <xmerlin> | do you have other "phy:/dev" in the configuration of your vm? |
| 09:15 | <bibekp> | xmerlin, yes |
| 09:15 | <xmerlin> | you have to make image for all of them |
| 09:15 | <xmerlin> | s/image/images/ |
| 09:16 | <bibekp> | xmerlin, separate image for each partition? |
| 09:16 | <bibekp> | xmerlin, ok |
| 09:16 | <xmerlin> | yes |
| 09:17 | <bibekp> | xmerlin, and in the new VM's conf, how should i use them? using the same phy:/dev style ? |
| 09:17 | <xmerlin> | you have to change syntax |
| 09:19 | <bibekp> | xmerlin, ok. i will look up the docs for that. |
| 09:20 | <bibekp> | xmerlin, btw, cant i create a new VM just by using the same phy:dev/ style? can two VM's share filesystem partitions ? |
| 09:20 | <xmerlin> | bibekp, old syntax file: |
| 09:20 | <xmerlin> | new syntax tap:aio: |
| 09:20 | <xmerlin> | no ...only clustered filesystem can be mounted twice |
| 09:21 | <bibekp> | xmerlin, ok. thanks a lot |
| 09:21 | <xmerlin> | :) |
| 09:21 | <bibekp> | xmerlin, could you recommend me some good online book on using xen? i am new to it |
| 09:22 | <xmerlin> | http://www.amazon.co.uk/Book-Xen-Practical-System-Administrator/dp/1593271867/ref=sr_1_1?ie=UTF8&qid=1286976130&sr=8-1 |
| 09:22 | <xmerlin> | is the best |
| 09:22 | <xmerlin> | a very good starting point |
| 09:24 | <bibekp> | xmerlin, thanks |
| 09:26 | <deshantm> | bibekp: other books are listed on the xen wiki |
| 09:26 | <bibekp> | deshantm, ok |
| 09:26 | <deshantm> | I am co-author of the book Running Xen |
| 09:26 | <bibekp> | deshantm, wow :) |
| 09:26 | <deshantm> | and another good book recently came out called The Book of Xen |
| 09:27 | <deshantm> | the authors of that hang in in irc and the mailing list too I think |
| 09:27 | <bibekp> | deshantm, cool |
| 09:27 | <bibekp> | deshantm, xmerlin i saw there is also ##xen at irc.freenode.net. which is the preferred channel of choice? |
| 09:27 | <deshantm> | more activity on ##xen on freenode |
| 09:27 | <deshantm> | but there are a few of us that try to monitor here as well |
| 09:28 | <bibekp> | deshantm, ok |
| 09:28 | <deshantm> | bibekp: the books typically have associated website |
| 09:28 | <deshantm> | for example, we have runningxen.com |
| 09:28 | <deshantm> | lots of links and such |
| 09:29 | <deshantm> | but the xen wiki has a lot of good information too |
| 09:29 | <deshantm> | we (xen.org) are in the process of improving the website and wiki |
| 09:29 | <bibekp> | deshantm, wow cool. do you need volunteers ? |
| 09:29 | <deshantm> | training slides are also available online |
| 09:29 | <deshantm> | bibekp: we always do yes |
| 09:30 | <deshantm> | i'll grab the link |
| 09:30 | <deshantm> | bibekp: http://cosi.clarkson.edu/docs/installingxen/ |
| 09:30 | <bibekp> | deshantm, i would love to do work in my free time. maintenance of ML, wiki maybe? |
| 09:30 | <bibekp> | deshantm, great. thanks |
| 09:31 | <deshantm> | bibekp: great, just let me know what you would need |
| 09:31 | <deshantm> | I'll drop you my email in a private message |
| 09:31 | <bibekp> | deshantm, sure |
| 09:32 | <deshantm> | i sent it there, we'll have a community manager again soon and he can do the coordination after that |
| 09:32 | <bibekp> | deshantm, i would be happy to help in some ways that you need. preferences: maintenance of ML, wiki, docs etc. |
| 09:33 | <deshantm> | bibekp: great |
| 09:33 | <deshantm> | that is where we need some help with |
| 09:33 | <bibekp> | deshantm, cool |
| 09:34 | <deshantm> | can you write up some ideas and email them to me, feel free to just start helping out to if you know how |
| 09:35 | <bibekp> | deshantm, sure. i will send a mail tonight |
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| 12:39 | <ShaunR> | is there anyway to log the console output of a PVM guest? besides starting a screen session first and then running xm create -v config.cfg |
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| 17:57 | <bibekp> | xmerlin, if you are free,i wanted to ask a question. from your experience, do you have a rough idea about how long it generally takes to clone 1 gb of disk? i need to send a scheduled downtime email, so wanted to calculate the downtime |
| 17:58 | <xmerlin> | bibekp, I'm free |
| 17:58 | <bibekp> | xmerlin, i already asked the question :) |
| 17:59 | <xmerlin> | how many disks ? ...what kind of disks? ...raid level? |
| 17:59 | <xmerlin> | 1 single disk can 30 to 40 Mbyte/s of sequential transfer |
| 17:59 | <xmerlin> | sata disk |
| 18:00 | <bibekp> | xmerlin, not using RAID atm. backup is managed externally |
| 18:00 | <xmerlin> | sata disk? |
| 18:00 | <bibekp> | xmerlin, yes |
| 18:00 | <xmerlin> | 7200rpm? |
| 18:00 | <bibekp> | xmerlin, i will check. just a min |
| 18:03 | <bibekp> | xmerlin, yes, 7200 rpm |
| 18:04 | <xmerlin> | less than 1 minute |
| 18:04 | <xmerlin> | ~30/40 seconds |
| 18:04 | <xmerlin> | if you save data on a different disk |
| 18:05 | <bibekp> | xmerlin, ok. |
| 18:05 | <bibekp> | if on the same disk, then it will take less time, right? |
| 18:05 | <xmerlin> | more time |
| 18:05 | <bibekp> | xmerlin, oh really. i wonder why |
| 18:06 | <xmerlin> | because 1 disk can do only a defined amount of IOPS |
| 18:06 | <xmerlin> | tipycall 1 sata 7200 ~70-90 IOPS |
| 18:07 | <xmerlin> | if you do read and write IOPS on the same disk ...the performances decrease |
| 18:07 | <bibekp> | xmerlin, hmm. ok |
| 18:07 | <xmerlin> | and a pure sequential operation changes in a mixed sequential - randow read/write ops |
| 18:08 | <xmerlin> | heads can do only 1 thing at a time |
| 18:08 | <bibekp> | xmerlin, ok. in disk-disk transfer, it is purely sequential |
| 18:08 | <xmerlin> | yes |
| 18:08 | <bibekp> | xmerlin, the one i'm talking of is on single disk. so it will take longer |
| 18:09 | <xmerlin> | yes |
| 18:09 | <bibekp> | xmerlin, almost double longer? |
| 18:09 | <xmerlin> | more |
| 18:09 | <bibekp> | xmerlin, ok |
| 18:09 | <xmerlin> | you can consider 3-4 times |
| 18:09 | <xmerlin> | to be sure |
| 18:09 | <bibekp> | xmerlin, hmm |
| 18:17 | <bibekp> | xmerlin, just for info's sake. how does the speed vary for an IDE disk ? |
| 18:18 | <xmerlin> | it depends on the interface (sata/SAS/FC), rpm, and obviously drive tech |
| 18:19 | <xmerlin> | a fast 15k sas disk can do 2x/2.5x compared to 7200 sata disk |
| 18:19 | <xmerlin> | an old drive in less performing than a new drive |
| 18:20 | <bibekp> | xmerlin, cool |
| 18:20 | <xmerlin> | for example on a machine with two seagate barracuda es 500 gb SAS in raid 1 can do 120 MByte/s of sequ. read |
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| --- | Log | closed Thu Oct 14 00:00:44 2010 |
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