Hi Norman and interested drbd users,
While attempting to create a similar configuration, I came across your Jan 2010
http://lists.linbit.com/pipermail/drbd-user/2010-January/013417.html post on
drbd performance benchmarking over ram disk. I have problems getting the
internal metadata going and as being pretty newbiew to drbd might do something
wrong:
> # drbdadm create-md resram
> Writing meta data...
> initializing activity log
> pwrite(6,...,32768,16740352) in md_initialize_common:AL failed: Input/output
> error
> Command 'drbdmeta 1 v08 /dev/ram0 internal create-md' terminated with exit
> code 10
Looking on the strace output of 'drbdmeta 1 v08 /dev/ram0 internal create-md' I
see that
a pwrite of 32KB at the pretty end of the device is failing with -EIO. My drbd
environment is made of kernel 2.6.35-rc3 and drbd 8.3.8 user space tools. Below
is also my config file.
I see that /dev/ram0 is being opened in O_SYNC|O_DIRECT manner, could this be
problematic?
Or.
> open("/dev/ram0", O_RDWR|O_SYNC|O_DIRECT) = 4
> fstat(4, {st_mode=S_IFBLK|0660, st_rdev=makedev(1, 0), ...}) = 0
> ioctl(4, BLKSSZGET, 0x7fff04230638) = 0
> ioctl(4, BLKGETSIZE64, 0x7fff04230578) = 0
> pread(4,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096,
> 16773120) = 4096
> open("/var/lib/drbd/drbd-minor-1.lkbd", O_RDONLY) = -1 ENOENT (No such file
> or directory)
> pread(4,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 69632,
> 0) = 69632
> pread(4,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096,
> 16773120) = 4096
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x7fb306af6000
> pwrite(4,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 32768,
> 16740352) = -1 EIO (Input/output error)
> write(2, "pwrite(4,...,32768,16740352) in "...,
> 83pwrite(4,...,32768,16740352) in md_initialize_common:AL failed:
> Input/output error
> ) = 83
> global { usage-count yes; }
>
> common {
> protocol C;
> startup { wfc-timeout 0; degr-wfc-timeout 120; }
> disk { on-io-error detach; }
> net {
> timeout 60;
> connect-int 10;
> ping-int 10;
> max-buffers 2048;
> max-epoch-size 2048;
> after-sb-0pri discard-zero-changes;
> after-sb-1pri discard-secondary;
> after-sb-2pri disconnect;
> }
> syncer { rate 250M; }
>
> meta-disk internal;
> }
>
> resource resram {
> device /dev/drbd1;
> disk /dev/ram0;
> on cto-1 {
> address 192.168.23.157:8888;
> }
> on cto-storage {
> address 192.168.23.90:8888;
> }
> }
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