Hello list, has anyone experienced problems on the AIX POWER8 system? ---------- Forwarded message ---------- From: R0b0t1 <r03...@gmail.com> Date: Sun, Sep 10, 2017 at 9:58 AM Subject: Re: [cfarm-admins] Extremely Slow Disk Access On GCC119 To: David Edelsohn <dje....@gmail.com>
Do you care to explain? I'm not trying to tell you how to do your job, I'm trying to make you aware of a problem. I do not understand how this could only be a problem with the disk controller, because I have never encountered such poor performance. If it is only a problem with the disk, has the disk been failing this whole time? I hope you do not mind, but I will be forwarding this to the GCC mailing list. I am concerned by your replies. On Sun, Sep 10, 2017 at 3:47 AM, David Edelsohn <dje....@gmail.com> wrote: > You're analysis is completely wrong. > > David > > On Sep 10, 2017 10:08 AM, "R0b0t1" <r03...@gmail.com> wrote: >> >> Thank you for the response! >> >> I don't necessarily mean to request funding for the AIX system in this >> ticket but I feel like I should point out that the system is more or >> less unusable if something requires any IO. Assuming the HD is >> anything modern it seems to me this is a scheduling or caching issue >> in the AIX kernel. >> >> To reiterate, something that should take a few minutes took a day due >> to slow IO. Something that should have taken a fraction of a second >> was taking minutes. >> >> That it could possibly be the AIX kernel makes me want to ask if it >> would be possible to migrate the system to Linux. However, I would >> assume someone needs it for doing testing on AIX. I can also just as >> well use GCC112. >> >> I am doing my best to not to monopolize GCC119, but it is very hard to >> design around certain IO operations being very slow. I am not sure if >> this is impacting any users; it doesn't seem like the AIX system >> receives regular use. >> >> Cheers, >> R0b0t1 >> >> On Sun, Sep 10, 2017 at 1:45 AM, David Edelsohn <dje....@gmail.com> wrote: >> > The backing disk array for the virtual I/O disks was under-designed >> > for the configuration of the system. There is a request to upgrade >> > the disk controller, but unclear if that will be funded. The I/O >> > system already has been tuned with bigger buffers so the performance >> > is much better than it was when originally installed. >> > >> > Please remember that all of the systems are shared systems and if >> > there is some limitations to the system, it affects all users, so >> > please try not to monopolize or overload the systems. >> > >> > Thanks, David >> > >> > On Sun, Sep 10, 2017 at 8:18 AM, R0b0t1 via cfarm-admins >> > <cfarm-adm...@lists.tetaneutral.net> wrote: >> >> Hello, >> >> >> >> I apologize for creating another ticket. I am in the process of >> >> running rm on a directory structure which is very quickly removed on >> >> the Linux CF machines I have used the command on. >> >> >> >> In addition the setup of a few software packages took about a day in >> >> total due to disk access when running configure scripts. On Linux, >> >> this completes in a matter of minutes. >> >> >> >> Is this a problem with AIX/jfs? >> >> >> >> Respectfully, >> >> R0b0t1 >> >> _______________________________________________ >> >> cfarm-admins mailing list >> >> cfarm-adm...@lists.tetaneutral.net >> >> https://lists.tetaneutral.net/listinfo/cfarm-admins
