Hello,
I am using the Xen 1.3 development sources, from the tarball on
the website. I was able to build and boot linux-2.4.26-xen0 as
Domain 0 on the beater box. However, I am unable to boot the
unprivileged domain using a separate partition for its root
filesystem. Both Domain 0 and Domain 1 are using Debian.
I downloaded the xeno-unstable-src.tgz tarball on August 12th. I
can try a newer version if anyone thinks that will help.
Here''s the dmesg & error I''m seeing while attempting to
boot
the unprivileged domain (same error with the xenU kernel):
Linux version 2.4.26-xen0 (root@experiment-07) (gcc version 3.3.4 (Debian
1:3.3.4-6sarge1)) #5 Tue Aug 17 17:13:07 EST 2004
On node 0 totalpages: 24576
zone(0): 4096 pages.
zone(1): 20480 pages.
zone(2): 0 pages.
Kernel command line: ip=dhcp root=/dev/xda1 ro 4 root=/dev/xda1 ro
Initializing CPU#0
Xen reported: 547.629 MHz processor.
Calibrating delay loop... 837.22 BogoMIPS
Memory: 93572k/98304k available (2290k kernel code, 4732k reserved, 721k data,
104k init, 0k highmem)
Dentry cache hash table entries: 16384 (order: 5, 131072 bytes)
Inode cache hash table entries: 8192 (order: 4, 65536 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer cache hash table entries: 4096 (order: 2, 16384 bytes)
Page-cache hash table entries: 32768 (order: 5, 131072 bytes)
CPU: L1 I cache: 16K, L1 D cache: 16K
CPU: L2 cache: 512K
CPU: Intel Pentium III (Katmai) stepping 03
POSIX conformance testing by UNIFIX
PCI: Probing PCI hardware
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
Journalled Block Device driver loaded
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
Event-channel device installed.
Xen virtual console successfully installed as tty
Starting Xen Balloon driver
pty: 256 Unix98 ptys configured
Initialising Xen virtual block device
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
Intel(R) PRO/1000 Network Driver - version 5.2.30.1-k1
Copyright (c) 1999-2004 Intel Corporation.
pcnet32.c:v1.28 02.20.2004 tsbogend@alpha.franken.de
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
hda: C/H/S=0/0/0 from BIOS ignored
hdb: C/H/S=0/0/0 from BIOS ignored
SCSI subsystem driver Revision: 1.00
Red Hat/Adaptec aacraid driver (1.1-3 Aug 17 2004 15:57:49)
megaraid: v1.18k (Release Date: Thu Aug 28 10:05:11 EDT 2003)
megaraid: no BIOS enabled.
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
LVM version 1.0.8(17/11/2003)
Initializing Cryptographic API
Initialising Xen virtual ethernet frontend driver<6>NET4: Linux TCP/IP 1.0
for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 8192 bind 16384)
ip_conntrack version 2.1 (768 buckets, 6144 max) - 288 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
NET4: Ethernet Bridge 008 for NET4.0
Bridge firewalling registered
Can''t write to read-only device 0d:01
kjournald starting. Commit interval 5 seconds
Can''t write to read-only device 0d:01
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 104k freed
INIT: version 2.86 booting
Activating swap.
Checking root file system...
fsck 1.35 (28-Feb-2004)
/dev/xda1: clean, 14724/915712 files, 82579/1831410 blocks
Error writing block 520 (Attempt to write block from filesystem resulted in
short write).
/dev/xda1: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
(i.e., without -a or -p options)
Error writing block 520 (Attempt to write block from filesystem resulted in
short write).
/dev/xda1: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
(i.e., without -a or -p options)
fsck failed. Please repair manually and reboot. Please note
that the root file system is currently mounted read-only. To
remount it read-write:
# mount -n -o remount,rw /
CONTROL-D will exit from this shell and REBOOT the system.
Press enter for maintenance
(or type Control-D to continue):
I checked the filesystem statistics it provided in Domain 0 and
it appears to be close, but not quite the exact same number of
files (including directories and other special files as "files").
Since I''ve never seen this error before, I really have no idea
what to do.
Regards,
--
wca
Purdue University Rosen Center for Advanced Computing
Office: MATH G135 @ Purdue - http://www.itap.purdue.edu/rcs/
NB: crypt.rcs.purdue.edu has retired recently, please use
andrewsw@crypt.rcac.purdue.edu for all future contact.
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> I am using the Xen 1.3 development sources, from the tarball on > the website. I was able to build and boot linux-2.4.26-xen0 as > Domain 0 on the beater box. However, I am unable to boot the > unprivileged domain using a separate partition for its root > filesystem. Both Domain 0 and Domain 1 are using Debian.Very odd. The ''short writes'' suggest that there''s some serious disagreement about the size of the partition that''s being exported.> I downloaded the xeno-unstable-src.tgz tarball on August 12th. I > can try a newer version if anyone thinks that will help.It might be worth a try, as there have been literally hundreds of changesets since then! BTW: which document did you get the ''xda'' syntax from? I believe ''xda'' still works, but I haven''t used it myself in ages as it''s now possible to export a device to appear as a hd[abcd] or sd[abcd] in the guest domain. This has the advantage that it typically avoids the need to edit the /etc/fstab. If you still have problems, please can you enable the debug flags in drivers/xen/blkback/common.h and rebuild and try again. You should get some messages appear in dom0 if you do a dmesg. To help debug this you''ll also need to post the output of /proc/partitions and ''/sbin/sfdisk -s'' and ''tune2fs -l'' on all the relevant partitions. We''ll also need to see the output from xend when the new domain is being started. Ian ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
On Sat, Aug 21, 2004 at 08:24:22AM +0100, Ian Pratt wrote:> Very odd. The ''short writes'' suggest that there''s some serious > disagreement about the size of the partition that''s being > exported. > > > I downloaded the xeno-unstable-src.tgz tarball on August 12th. I > > can try a newer version if anyone thinks that will help. > > It might be worth a try, as there have been literally hundreds of > changesets since then!OK, I tried the version available yesterday. It had the same problem, i.e. short writes.> BTW: which document did you get the ''xda'' syntax from? I believe > ''xda'' still works, but I haven''t used it myself in ages as it''s > now possible to export a device to appear as a hd[abcd] or > sd[abcd] in the guest domain. This has the advantage that it > typically avoids the need to edit the /etc/fstab.I get the same problem regardless of whether it''s called xda or hda. I did not try xda with yesterday''s snapshot.> If you still have problems, please can you enable the debug flags > in drivers/xen/blkback/common.h and rebuild and try again. You > should get some messages appear in dom0 if you do a dmesg.This file doesn''t seem to be available for 2.4.26, which is what I''m using. I do find it in the 2.6.7 sparse tree. Thanks for your time! Regards, -- wca Purdue University Rosen Center for Advanced Computing Office: MATH G135 @ Purdue - http://www.itap.purdue.edu/rcs/ NB: crypt.rcs.purdue.edu has retired recently, please use andrewsw@crypt.rcac.purdue.edu for all future contact. ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
On Sat, Aug 21, 2004 at 08:24:22AM +0100, Ian Pratt wrote:> BTW: which document did you get the ''xda'' syntax from? I believeSorry, forgot to answer this in my response. This syntax is in the default xm config file. Regards, -- wca Purdue University Rosen Center for Advanced Computing Office: MATH G135 @ Purdue - http://www.itap.purdue.edu/rcs/ NB: crypt.rcs.purdue.edu has retired recently, please use andrewsw@crypt.rcac.purdue.edu for all future contact. ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
> > If you still have problems, please can you enable the debug flags > > in drivers/xen/blkback/common.h and rebuild and try again. You > > should get some messages appear in dom0 if you do a dmesg. > > This file doesn''t seem to be available for 2.4.26, which is what > I''m using. I do find it in the 2.6.7 sparse tree.The file from the 2.6 tree is linked into the 2.4 build tree as its common between both. (It makes it easier for us to maintain than having two files). Are you sure you''re exporting the partition read-write rather than read-only? I guess that might result in ''short write'' messages. Ian ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Will, Could you modify your /etc/fstab for the domain you are booting (dom1) and set the sixth (last) field to 0 for all the mounted partitions? fsck will try to write to disks that are mounted read-only. Let us know if that works. Niraj On Tue, 24 Aug 2004 11:52:08 -0500, Will Andrews <andrewsw@crypt.rcac.purdue.edu> wrote:> On Sat, Aug 21, 2004 at 08:24:22AM +0100, Ian Pratt wrote: > > BTW: which document did you get the ''xda'' syntax from? I believe > > Sorry, forgot to answer this in my response. This syntax is in > the default xm config file. > > > > Regards, > -- > wca > Purdue University Rosen Center for Advanced Computing > Office: MATH G135 @ Purdue - http://www.itap.purdue.edu/rcs/ > NB: crypt.rcs.purdue.edu has retired recently, please use > andrewsw@crypt.rcac.purdue.edu for all future contact. > > ------------------------------------------------------- > SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media > 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 > Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. > http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xen-devel >------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
On Tue, Aug 24, 2004 at 05:59:00PM +0100, Ian Pratt wrote:> The file from the 2.6 tree is linked into the 2.4 build tree as > its common between both. (It makes it easier for us to maintain > than having two files).Ah, ok. I didn''t realize there were files shared between the sparse trees. I am rebuilding the kernel now, just replying to answer your question:> Are you sure you''re exporting the partition read-write rather > than read-only? I guess that might result in ''short write'' messages."Exporting" it? It''s just a filesystem I set aside for Xen domain 1, it''s not NFS mounted. Thanks, -- wca Purdue University Rosen Center for Advanced Computing Office: MATH G135 @ Purdue - http://www.itap.purdue.edu/rcs/ NB: crypt.rcs.purdue.edu has retired recently, please use andrewsw@crypt.rcac.purdue.edu for all future contact. ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
The block backend''s common.h for 2.4.26 will be under arch/xen/drivers/blkback/common.h Can you have a look at your configuration file and check the the domain is definitely being given write permission to its xda1? Could you also post the config file in question to the list. Cheers, Mark ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
> > Are you sure you''re exporting the partition read-write rather > > than read-only? I guess that might result in ''short write'' messages. > > "Exporting" it? It''s just a filesystem I set aside for Xen > domain 1, it''s not NFS mounted.''exporting'' is the term we use when telling xend/blkback to make a given block device accessible from another domain. E.g. The following exports /dev/hda3 read-write to the new domain, where it will appear as /dev/sda1: disk = [ ''phy:hda3,sda1,w'' ] In the above example, the sda1 is sometimes referred to as the target or destination device. Ian ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Hi Will, The xm defaults file has a list of entries for each device the domain is going to use. These are what we''re referring to as the "exports" - in this case they are exported from dom0 using Xen device channels, rather than NFS. They nevertheless have to be exported from dom0 because unprivileged domains can''t access their own disks directly. Each entry in the list has a field that is ''r'' for read-only or ''w'' (or, equivalently ''rw'') to allow write access. If you don''t have ''w'' or ''rw'' set for the xda1 device, then it will not be able to write to that filesystem, causing short writes. At this point, it''s worth noting that you should never share a filesystem between two domains unless they both have it mounted read only. So in this case, make sure you also have umounted the filesystem in dom0 before booting another domain from it. HTH, Mark ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
It''s probably worth adding this terminology to the manual docs... I''ll put it on my TODO list ;-) ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel