But that doesn't mean that all of the space is truly allocated and in-use on the back-end. You(or someone) has assigned all the space to volumes. So, the free space shown in the pool is what you have free from an administrative standpoint. They were great back in the day (1/4 the price of a EMC) but its time to move on. They run on MIPS processors, and are getting really long in the tooth (I'm hearing end of sale in the next two years on the line).
The controllers can take ~45 seconds to failover on some updates, which can cause VM's to crash and timeouts in applications etc. This wastes huge amounts of WAN bandwidth, and it ends up being cheaper to buy/do something else than the "free" replication technology.
The replication uses the same page size, so you end up with 15MB of data being generated on the WAN for a 4KB of data changing. Combined with reserves for replication, its not uncommon for me to see like 20% "usable capacity" vs RAW capacity (or even less!) if you try to retain any amount of snapshots and use the replication. So if you make a 4KB change to a word file, you'll generate a 15MB of snapshot delta. Why do you say they are useless? I'm just curious, since my knowledge is limited.
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