Tuesday, 12 January 2010

DataCore adds support for logical volumes up to 1 PB and the Asymmetric Logical Unit Access (ALUA) standard

http://itknowledgeexchange.techtarget.com/storage-soup/datacore-adds-support-for-logical-volumes-up-to-1-pb/
DataCore kicked off 2010 with updates to its SANSymphony and SANMelody storage virtualization software, adding support for logical volumes up to 1 PB and the Asymmetric Logical Unit Access (ALUA) standard...

DataCore director of product marketing Augie Gonzalez said that as with last year’s 1 TB “mega-cache” support, the logical limit is beyond where most customers will be looking to stretch today. But the previous 2 TB limit had grown impractical for making RAID sets out of the latest 1 TB and 2 TB SATA disks.

“The logical volume expansion and thin provisioning allows users to say, ‘I don’t care how big the volume will be in the future’,” Gonzalez said. “Rather than defining LUNs up front and then having to make changes later, you can immediately set up a large volume and expand the storage with no applicvation or infrastructure changes.”

A DataCore service provider customers says adding ALUA support will improve management in his storage environment. Joseph Stedler, director of data center engineering for cloud computing and managed IT service provider OS33, said he uses DataCore’s SANSymphony software to host back-end storage for his SMB customers. Right now SANSymphony is running on IBM System x servers in front of IBM DS3400 arrays and Xiotech Emprise 5000 storage devices, mirroring between redundant sets of the tiered hardware. The logical volume expansion will be especially helpful in cutting down on backup administration overhead, Stedler said.

“With two terabyte volumes, we had to present things in 2 terabyte chunks to our Veeam [backup] server,” he said. “With a larger primary volume we could have fewer backup targets to manage.”

Stedler said the addition of ALUA support will be even more important for creating multipath I/O in OS33’s VMware environment. “ALUA solves a major pain for everybody running DataCore with VMware,” he said. “The way VMware understood it before was active-passive only. DataCore was able to do active-active failover but with VMware you’d have to run multipathing with the most recently used path. The new release is fully compliant with ALUA, so VMware can view it as active-active.”

Stedler said he’s looking forward to the addition of more granular scripting capabilities for the software in future releases.