Hi, Andreas
Yeah, Thank you very much. I failed to make e2fsck on ost weeks ago, As a result, some files were destroyed. Then I find the reason why we failed doing it. I find someone said that there is some bugs for e2fsck. Due to this and the time pressure, our team is talking about whether to run e2fsck. So I really you can give some tips for it and show some points to pay attention! see inline... thanks, Sarea 2009-07-30 huangql 发件人： Andreas Dilger 发送时间： 2009-07-30 11:41:13 收件人： huangql 抄送： lustre-discuss 主题： Re: [Lustre-discuss] How to estimate the time for e2fsck on OST On Jul 30, 2009 09:00 +0800, huangql wrote: > Thanks so much to you. The variables of our filesystem as follow: > > size of the filesystem: 400TB This cannot be correct, given you have 1.7B 4kB blocks. Note that e2fsck time is in parallel on all OSTs. Sorry I don't know what you said, our filesystem is up to 400TB, and the inode, block parameters were set as default value. As you mentioned, a 7TB filesystem would take on the order of 2h or less. Is the time in parallel on all OSTs? > 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 Putting 4 OSTs on a single disk doesn't make sense. A single OST can be up to 8TB, and if you have multiple OSTs on the same disk(s) it will cause terrible performance problems due to seeking. > 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! Sorry for your misunderstanding, but providing anything more than a rough estimate of e2fsck time is the best that is possible. I would estimate (excluding errors in the filesystem) a 7TB filesystem would take on the order of 2h or less. > > 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. > _______________________________________________ > Lustre-discuss mailing list > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc.
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