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> 3 Samsung SSD 840 in single-volume RAID-1 configuration. A 3-way mirrored RAID? That seems like an odd setup, especially for a benchmark. I guess (?) reads c
by Erwin 12y ago
> 3 Samsung SSD 840 in single-volume RAID-1 configuration.
A 3-way mirrored RAID? That seems like an odd setup, especially for a benchmark. I guess (?) reads could be faster with an additional drive, but the system had 1 TB of memory so would pgbench create a working set beyond that anyway?
- olavgg 12y agoI've been using 3 mirrored drives for the last few years because I want extra protection. Think about it, one drive suddenly dies and you need to resilver/resync a new drive. What if there are some bad blocks on the existing drive that's left? With ZFS and 3 mirrored drives, these bad blocks would most likely be healed during the resilver operation.
- taneliv 12y agoAren't bad blocks detected during scrubbing? I assumed scrubbing every two weeks (as I do) should reveal read problems before any drives fail, at least in the common case. Maybe there's something important I'm missing?
- insaneirish 12y agoNo, you're not missing anything. Scrubbing catches it all. Seems your parent is concerned about errors between last scrub and a failure. This is why I have a backup system that I zfs send to.