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   February 19, 2019  
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[18:54:30] <KungFuJesus> How likely is openindiana to boot if I swap out a motherboard to one with a new chipset?
[18:55:23] <tsoome> you likely need to boot from iso/usb and re-build device tree and import boot pool.
[18:55:34] <KungFuJesus> oh that doesn't sound so bad, actually
[18:57:54] <KungFuJesus> tsoome: it doesn't appear you're in #zfs. I posed a question there and they're being kind of less than helpful about it
[18:58:27] <tsoome> it really is about our kernel, not about zfs itself
[18:59:00] <tsoome> the kernel can not discover the boot pool on its own atm.
[18:59:32] <tsoome> but there is a light at the end of the tunnel.
[18:59:44] <KungFuJesus> No I get that, but I'm referring to a separate question. The wisdom about mixing raidz1 and raidz2, do you know the reason behind that guideline? There's a storage pool I want to upgrade that ~80% capacity. It's comprised of raidz1s, but I want to use bigger volumes to the point where I really ought to be using raidz2 vdevs
[19:00:33] <KungFuJesus> what are the serious downsides to a "mutt" pool other than that the parity will take longer to write on some vdevs than others?
[19:00:39] <tsoome> the zfs is built on assumption of having the same quality vdevs for data
[19:00:54] <tsoome> quality in terms of protection and performance
[19:01:07] <tsoome> you can mix things, but it is not healthy
[19:01:25] <KungFuJesus> ok, so it's more about if you're leveraging more ditto blocks or something, the data isn't as consistently redundant depending on where they go
[19:01:32] <KungFuJesus> and the obvious performance implication
[19:01:32] <tsoome> and you will not get predictible results.
[19:01:41] <tsoome> yep
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[19:02:15] <KungFuJesus> and what sort of performance pathologies would you predict for a configuration like that?
[19:02:28] <tsoome> just different latency
[19:02:33] <KungFuJesus> you'll always be limited by the txg flush of the slowest vdev, I'm guessing
[19:06:20] <tsoome> such setup would make more sens with tiered pools and live data migration policies, but zfs can not do that.
[19:07:11] <KungFuJesus> The upgrade I'm considering is to a server with a max of 32GB of memory, so that's why I'm asking about the boot issue. The best pool upgrade option I've come up with so far (besides having just a permanently separate pool), is to create a temporary raidz2 based zpool large enough to hold all the datasets from the raidz1 based pool. ZFS send/recv them over, destroy old pool, add old disks as z2
[19:07:18] <KungFuJesus> vdevs
[19:07:54] <KungFuJesus> this creates an obvious write imbalance, none of the reads would be serviced over the newly added disks
[19:08:00] <tsoome> atm we can not boot multi vdev pools
[19:08:18] <KungFuJesus> right, the boot pool is a separate mirrored pool
[19:08:49] <tsoome> (the reason is the same - we need to be able to scan the disks for that)
[19:09:28] <KungFuJesus> unfortunately there's no auto rebalance that will migrate the data, and we have a lot of data that lives in snapshots so even manually rebalancing would be hard (and would force our incremental replication process to resend everything from scratch)
[19:11:22] <KungFuJesus> if raidz1 vdev removal were possible, we could gradually destroy datasets as they were moved and perhaps get a better balance of storage, as not all of the data would need to be migrated before added the existing disks. But alas, that doesn't seem possible in the current version
[19:11:43] <KungFuJesus> do you or does anyone in here perhaps have a saner idea?
[19:11:43] <tsoome> we can not remove raidz, no
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   February 19, 2019  
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