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=============cut from lustre's manual================
1.3.3 OSTs
An OST provides back-end storage for file object data (effectively, chunks of user files). Typically, multiple OSTs provide access to different file chunks. The MDT tracks the location of the chunks. On a node serving OSTs, an Object Storage Server (OSS) component provides the network request handling for one or more local OSTs.
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Is the above desc. not clear enough to you ?
About the OST limitation:
Did you ever read the official Lustre manual carefully? Or did you every read it ?????
In the manual Chapter 33.6 :
=================cut from Lustre manual====================================
33.6 Maximum Size of a Filesystem
For i386 systems in 2.6 kernels, the block devices are limited to 16 TB. Each OST or MDS can have a filesystem up to 8 TB (For 2.6 kernels, the 8 TB limit is imposed by ext3). You can have multiple OST filesystems on a single node. Currently, the largest production Lustre filesystem has 448 OSTs in a single filesystem. There is a compile-time limit of 8150 OSTs in a single filesystem, giving a theoretical filesystem limit of nearly 64 PB.
Several production Lustre filesystems have around 100 OSSs in a single filesystem. The largest filesystem in production is at least 1.3 PB (184 OSTs). All these facts indicate that Lustre would scale just fine if more hardware is made available.
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I suggest you put things down and open your browser , download the manual, read it (at least 10 times).Then you'll not waste our time to do "copy & paste" here!! |
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