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   March 11, 2015  
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[11:47:45] <mjlc> Hi all! I am following this project because I need to develop a "storage appliance" with a requirement of, at least, 500 MB/s in write operation
[11:48:29] <mjlc> do you have any tips for that?
[11:48:52] <mjlc> I suspect the problem is about iops in this bandwith
[11:49:36] <mjlc> using an eon web page on that it seems that for a balanced read/write operations the storage needs 525000 iops
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[11:55:02] <tsoome> well, the bandwith is iops * block size; if you have just bandwith requirement, you have a bit of problem, because if you dont know the [average] block size used by apps, you have to start guessing
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[13:01:47] <mjlc> I have used this formula, iops_needed = (150k * 0.5) + (150k * 0.5 * 6) having a 50% r/w workload with a raid penalty of 6 (raidz2)
[13:01:54] <mjlc> is this ok?
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[13:03:48] <mjlc> I am planning to use wd se 4tb disks with qlogic 2562
[13:04:26] <mjlc> can we share a little bit of info/tips around storage setup with oi?
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[16:20:25] <tomww> why WDs and not HGST?
[16:21:22] <tomww> and depending on your type of workload to add a suitable SSD for LOG
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[16:34:02] <patdk-wk> I have had no issues with my wd se's so far
[16:34:11] <patdk-wk> and none with hgst, or wd re's
[16:34:29] <patdk-wk> I am running around 50 of each type
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[23:16:40] <tomww> OKay
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[23:51:28] <DrLou> Speaking of OKay… How come I’m suddenly getting the old ‘Unable to mount the zone’s ZFS dataset’ error?
[23:52:34] <tsoome> usually you cant mount if there is something in the mountpoint - its not empty
[23:54:03] <DrLou> yeah, after rebuilding this pool I have overlapping mounts/dirs, it seems.
[23:54:33] <tsoome> then you need to clean up before you can start zones
[23:55:41] <DrLou> dev, root and ROOT - and they’re all empty.
[23:55:49] <DrLou> But what dumbness did I perform to create them?
[23:56:04] <tsoome> you received the pool?
[23:56:32] <DrLou> yes, back’d up ‘datapool’ to pool ‘backup’, then received it all back
[23:57:35] <tsoome> you can use -u with receive so the dataset will not get mounted after receive
[23:58:37] <DrLou> OK, thanks for weighing. As usual, you got my back!
[23:58:49] <tsoome> restoring the boot pool is a bit tricky in that sense - its datasets are supposed to be mounted on “real” fs hierarchy and that can mess things up
[23:59:21] <DrLou> luckily, I didn’t even dare try this yet on the rpool.
[23:59:42] <DrLou> I’ll spend some ‘quality time’ with this later tonight. Thanks again.
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   March 11, 2015  
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