[DRBD-user] Incorect size of replicated volume (more than >4TB) under 32bit kernel and DRBD 8.3.0

[Lars Ellenberg]

On Fri, Jan 23, 2009 at 05:41:08AM -0800, adikx wrote:
> 
> Hi all,
> 
> I have a problem with DRBD status under 32bit kernel, it shows incorrect
> size of replicated volume (555304 M
> ) where the real size of the volume is 4,6 TB.
> 
> I noticed that when size remaining to replicate comes to zero it starts to
> count from 4,1 TB and replication isn't interupted. After all volume is
> replicated correctly. 
> Under 64bit version of kernel problem doesn't exist.
> 
> Is there any solution to fix this problem ?
> 
> Thanks.
> 
> Tested on:
> Drbd 8.3.0 + Kernel 2.6.27.10 32bit & 2.6.27.10 64bit
> 

> Before size remaining to replicate comes to zero:
> # cat /proc/drbd
>  0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r---
>     ns:202228488 nr:0 dw:2109 dr:214523901 al:2 bm:13092 lo:58 pe:533
> ua:2015 ap:0 ep:1 wo:b oos:366405528
> 	[>....................] sync'ed:  4.2% (357817/555304)M
> 	finish: 6:43:03 speed: 192,744 (166,988) K/sec
> 
> After size remaining to replicate comes to zero:
> #cat /proc/drbd
>  0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r---
>     ns:568725512 nr:0 dw:2109 dr:581020545 al:2 bm:35461 lo:147 pe:52
> ua:2009 ap:0 ep:1 wo:b oos:4294873876
> 	[=>..................] sync'ed: 11.7% (4194212/555304)M
> 	finish: 5:24:11 speed: 220,468 (167,616) K/sec

try this:

diff --git a/drbd/drbd_proc.c b/drbd/drbd_proc.c
index c8593a7..3415480 100644
--- a/drbd/drbd_proc.c
+++ b/drbd/drbd_proc.c
@@ -79,8 +79,8 @@ STATIC void drbd_syncer_progress(struct drbd_conf *mdev, struct seq_file *seq)
 	/* if more than 1 GB display in MB */
 	if (mdev->rs_total > 0x100000L)
 		seq_printf(seq, "(%lu/%lu)M\n\t",
-			    (unsigned long) Bit2KB(rs_left) >> 10,
-			    (unsigned long) Bit2KB(mdev->rs_total) >> 10);
+			    (unsigned long) Bit2KB(rs_left >> 10),
+			    (unsigned long) Bit2KB(mdev->rs_total >> 10));
 	else
 		seq_printf(seq, "(%lu/%lu)K\n\t",
 			    (unsigned long) Bit2KB(rs_left),

-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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