Mailing List Archive: drbd status and compilation questions

I have a few questions about drbd.

1) I am doing investigations into building an HA environment using
Linux and have found drbd one solution for mirroring data between two Linux
machines. How stable is it to use in a semi-production environment (go-live
in April 2001)?

2) I am having trouble compiling drbd 0.5.7 on Redhat 6.2 using the
2.2.16-3 kernel. I have added -DCONFIG_MODVERSIONS and -DMODVERSIONS (did
not compile without it) to KERNFLAGS in Makefile.vars. I still get a message
from depmod -a saying "depmod: *** Unresolved symbols in
/lib/modules/2.2.16-3.1smp/block/drbd.o". Then when I try to insmod it, it
comes up with:

Using /lib/modules/2.2.16-3.1smp/block/drbd.o
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
proc_unregister_Ra668f85e
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
sock_alloc_R546a968e
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
sock_sendmsg_Rd80b12e0
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol kernel_flag
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
sock_create_R71055f51
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
kernel_thread_R7e9ebb05
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
proc_root_R9f91dbb5
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
kill_proc_info_R84c0b0d1
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
sock_release_R0fbed7c1
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
sock_recvmsg_R935ddbd6
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
proc_register_R8b411fd1
/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
send_sig_info_Rf910c6d7

Thanks in Advance

Richard Mottershead
Senior Systems Engineer
McKessonHBOC - Nottingham

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At 06:00 PM 10/10/00 +0100, Richard Mottershead wrote:
>I have a few questions about drbd.
>
>1) I am doing investigations into building an HA environment using
>Linux and have found drbd one solution for mirroring data between two Linux
>machines. How stable is it to use in a semi-production environment (go-live
>in April 2001)?

I am using it in production, and I tested it for three days writing
something like 2.5GB/Hour between two machines, one of which was an SMP
machine.

>2) I am having trouble compiling drbd 0.5.7 on Redhat 6.2 using the
>2.2.16-3 kernel. I have added -DCONFIG_MODVERSIONS and -DMODVERSIONS (did
>not compile without it) to KERNFLAGS in Makefile.vars. I still get a message
>from depmod -a saying "depmod: *** Unresolved symbols in
>/lib/modules/2.2.16-3.1smp/block/drbd.o". Then when I try to insmod it, it
>comes up with:

Your kernel symbols probably have a prefix of smp on them. Look in
/proc/ksyms or some such file ...

I found that an 'insmod -Psmp drbd' did the job, so I added the appropriate
stuff to /etc/conf.modules and all works.

>Using /lib/modules/2.2.16-3.1smp/block/drbd.o
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>proc_unregister_Ra668f85e
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>sock_alloc_R546a968e
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>sock_sendmsg_Rd80b12e0
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol kernel_flag
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>sock_create_R71055f51
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>kernel_thread_R7e9ebb05
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>proc_root_R9f91dbb5
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>kill_proc_info_R84c0b0d1
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>sock_release_R0fbed7c1
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>sock_recvmsg_R935ddbd6
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>proc_register_R8b411fd1
>/lib/modules/2.2.16-3.1smp/block/drbd.o: unresolved symbol
>send_sig_info_Rf910c6d7
>
>Thanks in Advance
>
>Richard Mottershead
>Senior Systems Engineer
>McKessonHBOC - Nottingham
>
>
>
>
>----------------------------------------------------------------------------
>The information contained in this e-mail is confidential and is intended
>only for the named recipient(s). If you are not the intended recipient you
>must not copy, distribute, or take any action or reliance on it.
>If you have received this e-mail in error, please notify the sender.
>Any unauthorised disclosure of the information contained in this e-mail
>is strictly prohibited.
>----------------------------------------------------------------------------
>
>
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>

Regards
-------
Richard Sharpe, sharpe@example.com
Samba (Team member, www.samba.org), Ethereal (Team member, www.zing.org)
Contributing author, SAMS Teach Yourself Samba in 24 Hours
Author, Special Edition, Using Samba