VMWare vSphere Recommended settings.

[DIESOFTWARE-RS]

Ben, thanks for the update.
Looking forward.... :-)

Regards,
Ralph

[jisaac]

Hi, just wanted to jump in on this thread... I've got two vSphere 4.0 hosts and two DSS v6 boxes running in an iSCSI failover configuration. I used the defaults out of the box but this weekend played around with the iSCSI target tweaks listed above.

My experience was that the tweaks worked, with the exception of MaxBurstLength = 16776192. When I set that, I lost contact with my luns... the effect was that inside my VM's, basically all disk access froze. Luckily I still had console access and when I set the MaxBurstLength back to the default of 262144 and reset the iSCSI connections my disks came back.

I tried a MaxBurstLength of 1047552 and that worked. I then tried a MaxBurstLength of
2097152 and the luns froze again, so I reset it back to 1047552 and ran Sunday and today with that value.

The changes that I saw were marginal - I ran a 32k 100% write test using iometer and where with the default settings I got 170 iops, with the new tweaks I got 195 iops... so I guess that's about 10% better in my unscientific testing.

Has anyone else tried the MaxBurstLength setting, and what's your experience with it?

[jisaac]

Sorry, just to answer the other questions:

What about iETD vs SCST? SCST

Writeback caching? Off due to the iSCSI failover replication

Bonding? Yes, using bonding on both iSCSI channel and replication channel (and mgmt, for what it's worth). I have two built-in gig ports and a quad-port intel NIC, so three pairs of network interfaces.

[icepicknz]

I have gone from 200mbps write to around 800mbps

MaxRecvDataSegmentLength 262144
MaxBurstLength 1048576
MaxXmitDataSegmentLength 262144
FirstBurstLength 262144

Thanks
Barry

[DIESOFTWARE-RS]

Hmm,
there is STILL not a recommended tuning setup for VMWARE ESX4.x or 5 by Open-E ?
Anybody out there ?

Regards,
Ralph

[Gr-R]

maxRecvDataSegmentLen=262144
MaxBurstLength=16776192
Maxxmitdatasegment=262144
FirstBurstLength=65536
DataDigest=None
maxoutstandingr2t=8
InitialR2T=No
ImmediateData=Yes
headerDigest=None
Wthreads=8

[colesgold]

Vmware vsphere provide SaaS also can anyone explain what are the benefits of it ? Can anyone explain how cloud computing and SaaS help in development growth of the business.

SaaS Vendors

[briant]

Sorry, I'm a DSS newbie.

Can you let me know where i can make these changes to the confguration of my DSS lite installation, as i am experiencing quite slow response from the storage.

Many thanks.