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RE: IO lockups and ext3 readonly filecorruption on RHEL4 (pre and postU4)



We're using the same systems with the same OS (well okay, actually
CentOS 4) and aren't seeing the same thing. 

2.6.14.3 #1 SMP PREEMPT Thu Dec 8 10:34:08 PST 2005 i686 i686 i386
GNU/Linux

..Chuck..
 

> -----Original Message-----
> From: tweeks [mailto:tweeks rackspace com] 
> Sent: Tuesday, September 05, 2006 1:54 PM
> To: ext3-users redhat com
> Subject: IO lockups and ext3 readonly filecorruption on RHEL4 
> (pre and postU4)
> 
> Has anyone been seeing IO lockup problems on EL4?  
> 
> I've tried multiple IO scheduler options (elevator=) in the 
> boot... I'm seeing the same behavior regardless.  Independent 
> of hardware.  Whitebox ATA, HA enclosure with dedicated SCSI, 
> megaraid RAID hardware, Dell 2850s... same
> behavior:
> 
> A semi-busy system will suddenly go into some kind of IO 
> la-la land where nothing can be written to disk for >1hour.  
> Of course when this happens, the
> ext3 kernel module freaks out and remounts all the 
> filesystems as readonly.  
> Then when the system is rebooted, if the system is allowed to 
> fsck, the journal is hosed and the filesystem eats itself.  
> Moving them off the RH kernel all together seems to fix the 
> problem, but I have not found a way to reproduce the problem 
> yet (burning and stress testing doesn't seem to make it 
> appear), so real re-testing is difficult at best.
> 
> It's become so big of a problem that we're moving some 
> customers that require rock solid systems either over to 
> RHEL3, or off RH and over to SLES or other distro with a 
> non-RH kernel.  
> 
> Just the ext3 problem (minus the IO lockup part) can be seen 
> in other BZ
> tickets:
> 	https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=175877
> (when the filesystem fills up)
> 
> Has anyone seen these type of IO lockups + ext3 corruption on RHEL4?  
> Can you reproduce it?
> 
> Tweeks
> 
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