| --- | Log | opened Mon Mar 03 00:00:26 2008 |
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| 10:11 | <stuartclark> | Hi there. I sent an email to xen-users last night (not sure if it was the right place to ask) regarding a problem I'm having with a virtual partition. In the dom0 all works fine, but from within the domU it can only see about 1Tb of the partition (which is 9Tb in total) |
| 10:11 | <stuartclark> | I was wondering if anyone had any ideas where this limit is coming from & how to fix :) |
| 10:19 | <mrvn> | stuartclark: MSdos partition table? |
| 10:19 | <mrvn> | or raw device? |
| 10:25 | <mrvn> | FYI: 8TiB are 2^32 4k pages. 2 TiB are 2^32 512byte blocks. One of those 2 overflows. |
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| 11:14 | <stuartclark> | Sorry |
| 11:14 | <stuartclark> | Is a LVM partition |
| 11:14 | <stuartclark> | Works quite happily within the dom0 |
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| 11:18 | <stuartclark> | mrvn: It seems the domU has some limit which doesn't exist in the dom0 |
| 11:19 | <wezhao> | when a guest domain is created, where are the page tables initialized? |
| 11:19 | <wezhao> | in setup_arch()? |
| 11:19 | <mrvn> | Maybe the xen virtual block device only uses 32bit block count? |
| 11:19 | <stuartclark> | Something which might be relivant: blockdev --getbsz give 4096 under dom0 but 512 under domU. Where is that controlled? |
| 11:20 | <mrvn> | stuartclark: lvm and vbd driver |
| 11:20 | <stuartclark> | Yep |
| 11:20 | <mrvn> | Can you try 1.9TiB and 7.9TiB? |
| 11:20 | <mrvn> | and 2.1 and 8.1 TiB |
| 11:20 | <stuartclark> | How do you mean? |
| 11:20 | <wezhao> | I'm reading the source code and get some questions |
| 11:21 | <mrvn> | Start with a 1.9TiB volume. That should work. Then check if 2.1TiB works, then 7.9TiB and 8.1 TiB. |
| 11:21 | <stuartclark> | Hmm |
| 11:21 | <mrvn> | Then you know if the problem is at 2^32 512byte blocks or 2^32 4k blocks. |
| 11:21 | <stuartclark> | I will have to see if that is doable - As the 9Tb partition contains lots of data |
| 11:21 | <mrvn> | Maybe create a sparse loopback file. |
| 11:21 | <stuartclark> | ok |
| 11:22 | <stuartclark> | I'm guessing it is something to do with using 512 blocks instead of 4096 |
| 11:22 | <mrvn> | Or add some debug output in the vbd frontend and backend showing the sizes it gets and see if they use uint32_t or uint64_t at the same time. |
| 11:23 | <stuartclark> | So where should I be looking code wise? |
| 11:23 | <mrvn> | vbd frontend and backend |
| 11:24 | <stuartclark> | Off I go to download the source then :p |
| 11:42 | <stuartclark> | hmm |
| 11:43 | <stuartclark> | Not making too much sense to me unfortunatly :( |
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| --- | Log | closed Tue Mar 04 00:00:10 2008 |
