Low Performance second VHDX & Good on the first one.

hi, 

let me describe scenario.

hyper-v 3 node cluster:  3 x ibm x3650 m4

shared storage (csv): iscsi - multiplath ibm storwize v3700

hyper-v node 1 owner of csv vhdx resides , file server in running.

file server windows 2008 r2 date, 2 vhdx attached on same virtual controller ide0. 1 system 40gb , second 1 data 3tb.

we noticed our file server vm performing badly  when copying files began investigating , after reinstalling s.o. (windows 2008 r2) , bringing production performance didn't better. copied same 7gb file data vhdx system vhdx, took 10min, giving 100mbps rate transfer within 2 disks :-(

now have 2 copies of same file, 1 in system vhdx , other 1 in data vhdx have transferred same physical machine, windows 2012:

image file size 7gb being copied file server system vhdx physical machine:

image file size 7gb being copied file server data vhdx physical machine:

both copies taken when file server activity low. 

so looks related virtual hard disk access have no clue on how address this. 

many thanks,

hi elton,

i've moved data vhdx ide controller scsi performance still same. 

i've noticed virtual disk dynamic expansion vhdx, , after reading bit fixed , dynamic disks, think explain low reading performance, adding volume 85% fragmented, explain problem. reckon?

i'll convert disk fixed disk , defrag, post results, take several weeks. 

thanks

rafa

Windows Server  >  Hyper-V