Dne 27.9.2014 v 22:35 Micky napsal(a):
Because it is LVM! :)
And that's what I call 'Very helpful answer'
On Sat, Sep 27, 2014 at 10:42 PM, Errol Neal <eneal@businessgrade.com
<mailto:eneal@businessgrade.com>> wrote:
Hi There. Hoping to get some clarity on some performance woes in a little
testing environment that I've setup.
I am experimenting with LVM mirrors on a CentOS 6.5 cluster.
Are you using 'exclusive' single node activation - or is your
mirror active on multiple nodes with cmirrord ?
I have two VMs running on ESX5.5 that are sharing two RDM luns from an SRP
target server running SCST.
Performance however seems to take a huge hit compared to a vanilla volume
[root@scst1 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
hadata 2 5 0 wz--nc 999.99g 149.99g
vg_scst1 1 2 0 wz--n- 39.51g 0
[root@scst1 ~]# lvs -a -o +devices
lvs -a -o+lv_active
If you don't need cluster-wide mirror activation - use the local version:
lvchange -aey vg/mirror
Note - new mdraid is supported only in 'exlusive' mode.
Zdenek
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