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Vol. 1 No. 4 June 2002

A further look at business continuance volumes

A proactive approach to laying out data enables the magic of mirroring for business continuance and replication. As discussed in the April issue, (see "Integration") implementing business continuance volumes (BCVs) can be a tricky proposition. Data must be mapped from the application to physical storage if mirrors are to be useful for backup, testing or decision support. Storage managers need to plan their disk layouts to facilitate mirroring and sharing. Storage space is abstracted at many levels within the data path with little visibility from layer-to-layer. Disks are combined into RAID sets. Those sets are then presented to servers as logical unit numbers (LUNs). The LUNs are combined into volume groups, which are carved into volumes. Volumes host filesystems and filesystems contain files, which contain data. Users want data - not LUNs - but arrays can only act on LUNs. While storage vendors are working on automated mapping of content to physical devices, such products are few and immature. The BCV layout problem stems from ...

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Features in this issue

  • Now, That's a Cluster!

    Lawrence Livermore National Labs is pushing the envelope with a new storage cluster that mates 115TB of networked disk with a massive cluster of 600 dual Pentium 4 servers.

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