On Wed, Nov 12, 2008 at 05:58:26PM +0000, Tim Bishop wrote:
> I run the mksnap_ffs command to take the snapshot and some time later
> the system completely freezes up:
>
> paladin# cd /u2/.snap/
> paladin# mksnap_ffs /u2 test.1
Someone (not named because they choose not to reply to the list) gave me
the following patch:
--- sys/ufs/ffs/ffs_snapshot.c.orig Wed Mar 22 09:42:31 2006
+++ sys/ufs/ffs/ffs_snapshot.c Mon Nov 20 14:59:13 2006
@@ -282,6 +282,8 @@ restart:
if (error)
goto out;
bawrite(nbp);
+ if (cg % 10 == 0)
+ ffs_syncvnode(vp, MNT_WAIT);
}
/*
* Copy all the cylinder group maps. Although the
@@ -303,6 +305,8 @@ restart:
goto out;
error = cgaccount(cg, vp, nbp, 1);
bawrite(nbp);
+ if (cg % 10 == 0)
+ ffs_syncvnode(vp, MNT_WAIT);
if (error)
goto out;
}
With the description:
"What can happen is on a big file system it will fill up the buffer
cache with I/O and then run out. When the buffer cache fills up then no
more disk I/O can happen :-( When you do a sync, it flushes that out to
disk so things don't hang."
It seems to work too. But it seems more like a workaround than a fix?
Tim.
--
Tim Bishop
http://www.bishnet.net/tim/
PGP Key: 0x5AE7D984
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