[Lustre-discuss] How to estimate the time for e2fsck on OST

[huangql]

Hi, Andreas

Thanks so much to you. The variables of our filesystem as follow:

size of the filesystem: 400TB
number of inodes: 427220992  (set as the default inode size 256)
number of allocated blocks:1708867323 (set as the default block size 4096)
distribution of the above on the disk: 4 OSTs on one disk
amount of RAM on server: 16GB
speed of the CPU: Intel(R) Core 8 CPU
speed of the disks:7200

Can you give us the more details according to the parameters? And give us some suggestions to do e2fsck or make it do faster. We are worried about it may destroy the filesystem.

Thank you in advanced for your help!

thanks,
Sarea

2009-07-30 



huangql 



发件人： Andreas Dilger 
发送时间： 2009-07-29  18:33:13 
收件人： huangql 
抄送： lustre-discuss 
主题： Re: [Lustre-discuss] How to estimate the time for e2fsck on OST 
 
On Jul 29, 2009  15:16 +0800, huangql wrote:
> We want to run e2fsck on OSTs to finish them. However, as to the
> running time, we should estimate how long it takes to run e2fsck on
> OSTs. We hopefully to know what elements to affect the running time like
> the size of OST, the average size of files and so on. Can you give us
> the tips for it? And I hope to receive you email as soon as possible.
The variables in your question are numerous:
- size of the filesystem
- number of inodes
- number of allocated blocks
- distribution of the above on the disk
- speed of the disks
- speed of the CPU
- amount of RAM on server
Reasonable e2fsck times (without serious filesystem problems) might
take between 5 minutes and 2 hours.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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