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On 2/6/18 9:32 AM, E.S. Rosenberg wrote:<br>
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<div>Hello fellow Lustre users :)<br>
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Since I didn't want to take the "size of MDT, inode
count, inode size" thread too far off-topic I'm starting
a new thread.<br>
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I'm curious how many people are using SSD MDTs?<br>
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We've used SSDs exclusively as MDTs for several years, set up as
groups of mirrors (2-way and 3-way) in ZFS. The mirrors span two SSD
disk enclosures. Our tests showed improved MD performance, though I
don't have the numbers. <br>
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<div>Also how practical is such a thing in a 2.11.x Data On
MDT scenario?<br>
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Is using some type of mix between HDD and SSD storage for
MDTs practical?<br>
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You could use SSDs for separate cache or ZIL SLOG devices. I
wouldn't think you'd want to mix the two otherwise except during the
transition of HDD -> SSD.<br>
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<div>Does SSD vs HDD have an effect as far as ldiskfs vs zfs?<br>
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Nothing I'm aware of. ldiskfs vs. ZFS is a separate decision.<br>
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Thanks!<br>
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Eli<br>
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