On Thu, 25 Oct 2012, Marcy Cortes wrote: > Yes! We are using LVM extensively. > So cfq is being used on LVM by default then?
Nope. As explained the default IO scheduler on sles11 on z for all block devices is deadline (unless you change the default; DASD being the exception using deadline regardless of the default). Regards, Sebastian > > > 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 Peter > Oberparleiter > Sent: Thursday, October 25, 2012 12:55 AM > To: [email protected] > Subject: Re: [LINUX-390] I/O scheduler on sles 11 sp2 on z > > On 24.10.2012 18:54, Marcy Cortes wrote: > > "On IBM System z the default I/O scheduler for a storage device is set by > > the device driver", but trying to query what it is seems to indicate that > > everything is deadline already (but it must not be or the parm wouldn't > > have helped). > > Could it be that you are using LVM which adds its own block devices which are > not affected by DASD's elevator defaults? > > > Regards, > Peter Oberparleiter > > -- > Peter Oberparleiter > Linux on System z Development - IBM Germany > > ---------------------------------------------------------------------- > 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 more information on Linux on System z, visit http://wiki.linuxvm.org/ > > ---------------------------------------------------------------------- > 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 more information on Linux on System z, visit > http://wiki.linuxvm.org/ > > ---------------------------------------------------------------------- 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 more information on Linux on System z, visit http://wiki.linuxvm.org/
