We used to use Levanta (now out of business) whose mapfs was based on unionfs. We didn't see any CPU reduction when we converted off of it. It did use a lot of CPU at shutdown time, but that may have been more of a bug than a necessity ;)
Marcy "This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation." -----Original Message----- From: Linux on 390 Port [mailto:[email protected]] On Behalf Of Rob van der Heij Sent: Thursday, May 14, 2009 8:53 AM To: [email protected] Subject: Re: [LINUX-390] Stateless Linux for zSeries On Thu, May 14, 2009 at 5:01 PM, Hall, Ken (GTS) <[email protected]> wrote: > Most of the "stateless" implementations I've seen seem to rely on "bind > mounts", but that seems to be a bit of a hack. "Union" mounting, such > as "Unionfs" look like it would be a cleaner approach, but I can't find > out if there's a workable implementation of that. Any ideas? > > I've pulled the unionfs patch, but I'm reluctant to go to the trouble of > maintaining yet another custom kernel module. Last time I looked at unionfs was probably 3 years ago. It still had some functional issues, but some of those may have been addressed since then. I initially used it for my "Penguins on a Pin Head" project. One of my my concerns back then was the extra CPU time spent in dealing with the unionfs layers. That is not an issue on dedicated hardware because you don't notice a few percent extra CPU when the data must come from disk or NFS mounted devices. Rob ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
