Hi Everyone, My Xen host has 2 X 1TB hard drives in a RAID1 setup. If one DomU starts to dd a 5GB file (A ran it in a loop as a test), access ssh on the other DomU becomes very slow. Is this normal? Many Thanks _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Saturday 03 July 2010 15:17:13 Jonathan Tripathy wrote:> Hi Everyone, > > My Xen host has 2 X 1TB hard drives in a RAID1 setup. If one DomU starts > to dd a 5GB file (A ran it in a loop as a test), access ssh on the other > DomU becomes very slow. > > Is this normal? > > Many Thanks > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >I think this can be expected with things like a dd which could hog the disk bandwidth. Do a bonnie++ benchmark to see what the disk can do and then do a iotop while you are doing the dd and you will see how much is consumed and how much is left for the other DomUs. B. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On 03/07/10 15:43, Bart Coninckx wrote:> On Saturday 03 July 2010 15:17:13 Jonathan Tripathy wrote: > >> Hi Everyone, >> >> My Xen host has 2 X 1TB hard drives in a RAID1 setup. If one DomU starts >> to dd a 5GB file (A ran it in a loop as a test), access ssh on the other >> DomU becomes very slow. >> >> Is this normal? >> >> Many Thanks >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xensource.com >> http://lists.xensource.com/xen-users >> >> > I think this can be expected with things like a dd which could hog the disk > bandwidth. Do a bonnie++ benchmark to see what the disk can do and then do a > iotop while you are doing the dd and you will see how much is consumed and how > much is left for the other DomUs. > > B. >I''m using centos as my Dom0. iotop doesn''t seem to be available for Centos, and I don''t think my kernel has the correct modules for dstat to work in a similar manner to iotop. Any other ideas? Could I just run iotop in a Ubuntu DomU? Would that give me correct results? Thanks _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
----- Original message -----> > On 03/07/10 15:43, Bart Coninckx wrote: > > On Saturday 03 July 2010 15:17:13 Jonathan Tripathy wrote: > > > > > Hi Everyone, > > > > > > My Xen host has 2 X 1TB hard drives in a RAID1 setup. If one DomU starts > > > to dd a 5GB file (A ran it in a loop as a test), access ssh on the other > > > DomU becomes very slow. > > > > > > Is this normal? > > > > > > Many Thanks > > > > > > _______________________________________________ > > > Xen-users mailing list > > > Xen-users@lists.xensource.com > > > http://lists.xensource.com/xen-users > > > > > > > > I think this can be expected with things like a dd which could hog the disk > > bandwidth. Do a bonnie++ benchmark to see what the disk can do and then do a > > iotop while you are doing the dd and you will see how much is consumed and how > > much is left for the other DomUs. > > > > B. > > > > I''m using centos as my Dom0. iotop doesn''t seem to be available for > Centos, and I don''t think my kernel has the correct modules for dstat to > work in a similar manner to iotop. Any other ideas? Could I just run > iotop in a Ubuntu DomU? Would that give me correct results? > > Thankscompiling it from source? _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Saturday 03 July 2010 19:16:37 Jonathan Tripathy wrote:> On 03/07/10 15:43, Bart Coninckx wrote: > > On Saturday 03 July 2010 15:17:13 Jonathan Tripathy wrote: > >> Hi Everyone, > >> > >> My Xen host has 2 X 1TB hard drives in a RAID1 setup. If one DomU starts > >> to dd a 5GB file (A ran it in a loop as a test), access ssh on the other > >> DomU becomes very slow. > >> > >> Is this normal? > >> > >> Many Thanks > >> > >> _______________________________________________ > >> Xen-users mailing list > >> Xen-users@lists.xensource.com > >> http://lists.xensource.com/xen-users > > > > I think this can be expected with things like a dd which could hog the > > disk bandwidth. Do a bonnie++ benchmark to see what the disk can do and > > then do a iotop while you are doing the dd and you will see how much is > > consumed and how much is left for the other DomUs. > > > > B. > > I''m using centos as my Dom0. iotop doesn''t seem to be available for > Centos, and I don''t think my kernel has the correct modules for dstat to > work in a similar manner to iotop. Any other ideas? Could I just run > iotop in a Ubuntu DomU? Would that give me correct results? > > Thanks >there is even a RPM for it http://guichaz.free.fr/iotop/ I''m thinking of a word and it starts with "laz". _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
there is even a RPM for> it> >http://guichaz.free.fr/iotop/I''m thinking of a word and it starts> with "laz".I am thinking of the word "as" as in "astute enough to know that CentOS by default won''t meet the requirements of that RPM... i.e. the kernel version is too old. (needs 2.6.20+, according to the very link you posted)" If you are going to try to be so smart, I suggest you make sure you check your facts fully... I''m thinking of a work and it sta.... nah... I won''t be so childish. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Sunday 04 July 2010 03:19:32 Ian Murray wrote:> there is even a RPM for > > > it > > > > >http://guichaz.free.fr/iotop/ > > I''m thinking of a word and it starts > > > with "laz". > > I am thinking of the word "as" as in "astute enough to know that CentOS by > default won''t meet the requirements of that RPM... i.e. the kernel version > is too old. (needs 2.6.20+, according to the very link you posted)" > > If you are going to try to be so smart, I suggest you make sure you check > your facts fully... I''m thinking of a work and it sta.... nah... I won''t > be so childish. > > > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >not the point, he can use the source. the point is that, to me at least, the mailing list is not meant to cut corners. I get what is going on: he took a considerable commercial project on while being a newbie at it and I see posts coming whenever there is an obstacle, sometimes minutes apart. I have to work at my solutions while doing research, studying, trying, experimenting. If I still don''t get it, I''ll go ask for assistance. But this is my ethos, if other people still want to help, that''s fine, I just don''t feel comfortable helping someone making money this way. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users