>Number:         22400
>Category:       kern
>Synopsis:       FFS with softdep RAIDFrame hangs system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 08 01:48:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     
>Release:        NetBSD 1.6.1_STABLE
>Organization:
	
>Environment:
	
	
System: NetBSD antrax.cynisk.net 1.6.1_STABLE NetBSD 1.6.1_STABLE (ANTRAX.raid) #1: Thu Aug 7 21:22:03 CEST 2003 term@antrax.cynisk.net:/usr/src/sys/arch/i386/compile/ANTRAX.raid i386
Architecture: i386
Machine: i386
>Description:
When using softdep-enabled FFS on a large (I haven't reproduced it on arrays smaller than 10Gb) RAIDFrame volume, writes to the filesystem eventually hangs the system. Only Raid-5 on a three disk volume tested. If starting a copy and then watching the memory buffers (with top for example) the File: field grow rapidly and when it reaches the amount of total physical memory the system hangs. No response at all, debugging not possible.
>How-To-Repeat:
1, Create a RAIDFrame RAID-5 volume with a total disk space of more than 10Gb
2, Disklabel/newfs the created device
3, Mount it with -o softdep
4, Write an amount of files (>phys. memory) to the file system.
5, Watch the system hang.
>Fix:
Do not use soft updates.
>Release-Note:
>Audit-Trail:
>Unformatted: