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May 23rd, 2013 03:00
VMware migration from EMC to EQL
Hi all,
Hope someone can help?
A customer is migrating vSphere from EMC to EqualLogic
Existing setup:
CX4-120, 2x Brocade 300, each ESXi host has 2x Emulex LPe1150 4Gb HBA's and two NICs with EQL MEM installed withaccess to a VMFS5 LUN on the EQL.
The EMC LUN is on 5x SATA II disks, RAID 5, it's a physical RDM in ESXi.
When performing a cold Storage vMotion to the EQL data throughput is only 235Mbps :( I have a limited downtime window and 2TBs to move.
I know that the block size difference between VMFS 3 & 5 can be slow but we hoped for something faster from the EMC.
Any help gratefully received.
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Dev Mgr
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9.3K Posts
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May 24th, 2013 06:00
Is that 235MB/s or 235Mb/s?
235MB/s would be very good performance and a cold storage vMotion would only take ~2.5 hours.
A 4Gb HBA can sustain about 400MB/s. Combined the HBAs can obviously do ~800MB/s in that case. You didn't mention why kind of Equallogic setup you have (switch models (and are they dedicated to iSCSI or also processing LAN traffic (but at least on an isolated VLAN), EQL model (specifically 1Gbit vs 10Gbit), HBA models, etc), so it is hard to say what to expect there. The raid type on the Equallogic unit also plays a role. When writing a lot of data (2TB for instance), any parity based raid will be much slower than raid 10.
If you want to limit downtime, and assuming you have at least vSphere 5.1 with standard or higher licensing (or enterprise if it is a lower version of vSphere), have you considered using live storage vMotion?
austintovey
37 Posts
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May 24th, 2013 07:00
Hi,
Thanks for responding. It's as I wrote 235Mb/s :(
My EqualLogic setup is good and performs very well. 2xPC7024, MEM etc, IOMeter results 8500+ IOPS and 250+ MB/s.
Storage vMotion is out of the question as you only migrate RDM-P via cold clone.
Farley sure is the EMC, (although my skill is with EQL), I checked the read and write cache. Digging around I see the EMC DataStores say 'unsupported' in ESXi. Google suggests changing the EMC to failover mode 4 ALUA. But I don't want to fiddle.
I noticed the the queue depth in ESXTOP is only 32 deep on the EMC LUNS but the EQL is 128, I have seem queue depth have an impact on performance before.
Any further help gratefully received.