Best Practices for LVM volume sizing

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Issue

On one of our systems we have a 6TB logical volume mount point. We had a physical storage issue which caused the filesystem on the logival volume to become unusable. It took 18+ hours for fsck to fix the filesystem before being able to use it.

We have a tight SLA where at best we can tolerate a 1 hour outage.

All the storage is SAN based.

  1. Are their best practices for LVM sizing?

  2. Is there a way to to speed up fsck?

  3. Is there a white paper which discusses under what scenarios is best suited for LVM and what scenarios is best suited for just plain physical disk?

  4. Does fsck perform the same on physical disk as it does LVM disk? I am assuming so, since it is just repairing the file system.

  5. Is there a white paper/document that dicusses storage best practices using SAN storage in a RedHat Linux environment?

Environment

Red Hat Enterprise Linux 6

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