[Lustre-discuss] OST size limitation

[Charland, Denis]

I read in the Lustre Operations Manual that there is an OST size limitation of 16 TB on RHEL and
8 TB on other distributions because of the ext3 file system limitation. I have a few questions about that.

Why is the limitation 16 TB on RHEL?

I plan to use Lustre 1.8.5 on Fedora 12 for a new Lustre file system. What will be the OST size limitation?

What is the OST size limitation when using ext4?

Is it preferable to use ext4 instead of ext3?

If the block device has more than 8 TB or 16 TB, it must be partitioned. Is there a performance degradation
when a device has multiple partitions compared to a single partition? In other words, is it better to have three
8 TB devices with one partition per device than to have one 24 TB device with three partitions?

Denis Charland
UNIX Systems Administrator
National Research Council Canada

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