Re: [Jfs-discussion] Failure to allocate memory leaves file-system(s) as read-only?

[William Marshall]

[EMAIL PROTECTED] wrote on 05/13/2005 04:40:43 AM:

> Couple of messages from the log:
>
> __alloc_pages: 1-order allocation failed
> __alloc_pages: 0-order allocation failed

We used to see this when we were running our own 2.4.24 kernel builds from kernel.org. I can't find the exact errors anymore, but I think we saw (at least) the 0-order error.

We've now moved to RHEL 3 and things are running fine with no memory errors.

> Exactly why this system is running out of memory has yet to be
> established, but it seems to
> also cause one or two JFS filesystems to turn read-only?  Which in
> turn only exacerbates the problem.
> Is this intentional behaviour?

I don't think we saw JFS go read-only in this case, but eventually the systems would become unresponsive and we were agressively rebooting for a while.

Bill Marshall
IBM Global Services Unix & Intel Servers
Rochester PC Server Team
Building 020-3, Rochester, MN