Hi;
The problem is that the resync _never_ finishes. I mean
never. Or are you saying you took the sse code for the
MMX out of something besides the xor.h?
With our one patch, we can get it started but the
resync never goes forward.
thanks, Scott
-----Original Message-----
From: Rajagopal Ananthanarayanan
To: Scott Smyth
Cc: 'linux-xfs@xxxxxxxxxxx '; Dale Stephenson; neilb@xxxxxxxxxxxxxxx
Sent: 1/5/01 10:06 AM
Subject: Re: LVM w/ XFS: 1) raid 5 issues (sync daemon) & 2) XFS in kernel
w/ LVM
Scott Smyth wrote:
>
> Hi;
>
> Now that LVM is in the SGI tree, we would like to
> find out if anybody is seeing similar issues
> around RAID 5 software support and the complaints
> of mount with XFS in the kernel and trying to mount
> LVM volumes:
>
> LVM 0.9 (obviously)
> 2.4.0-test13-pre3 and 2.4.0-prerelease
>
> First, there are two problems we seem to have with
> RAID 5 with LVM on top and XFS as the file system.
> The first is that the MMX optimization in xor.h
> fails and keeps the xor module from even loading
> properly (see attached patch to avoid this). Having
> gotten around that, we then have a problem with
> the rsync daemon. We get a kernel oops (we have not
> had time to use kdb on it yet but will) on the
> starting the raid, but you can still proceed and
> use it. However, it never resyncs nor makes any
> progress to resync according to /proc/mdstat. Then,
> at shutdown of the raidset (or attempted), the
> raid stop hangs. We will give more info as we debug,
> but it is 100% reproduceable.
>
[ ... ]
Hi,
We have seen similar issues both w.r.t the sse optimizations
and w.r.t re-syncing. The sse issue surfaced when the raid
code got re-worked to factor out some of the architecture/processor
specific optimizations. I don't know if accessing the device
while resyncing is intented to work. One workaround for the
resync problem is to wait for the raid to finish resyncing;
the status, as you noted, is reported in /proc/mdstat.
In our test box, the processor is:
----------
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 7
model name : Pentium III (Katmai)
stepping : 2
cpu MHz : 500.141
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 mmx
fxsr sse
bogomips : 996.15
--------------------
I'll cc: Neil Brown who seems to be actively maintaining
the RAID subsystem.
thanks,
------------------------------------------------------------------------
--
Rajagopal Ananthanarayanan ("ananth")
Member Technical Staff, SGI.
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