Re: [lustre-discuss] confused about mdt space

2020-04-02 Thread Andreas Dilger
On Apr 1, 2020, at 08:59, Mohr Jr, Richard Frank mailto:rm...@utk.edu>> wrote: On Apr 1, 2020, at 10:07 AM, Mohr Jr, Richard Frank mailto:rm...@utk.edu>> wrote: On Apr 1, 2020, at 3:55 AM, 肖正刚 mailto:guru.nov...@gmail.com>> wrote: For " the recent lustre versions use a 1KB inode size by

Re: [lustre-discuss] confused about mdt space

2020-04-01 Thread 肖正刚
Now, I am clear. Thanks Richard ! Mohr Jr, Richard Frank 于2020年4月1日周三 下午10:59写道: > > > > On Apr 1, 2020, at 10:07 AM, Mohr Jr, Richard Frank > wrote: > > > > > > > >> On Apr 1, 2020, at 3:55 AM, 肖正刚 wrote: > >> > >> For " the recent lustre versions use a 1KB inode size by default and > the

Re: [lustre-discuss] confused about mdt space

2020-04-01 Thread Mohr Jr, Richard Frank
> On Apr 1, 2020, at 10:07 AM, Mohr Jr, Richard Frank wrote: > > > >> On Apr 1, 2020, at 3:55 AM, 肖正刚 wrote: >> >> For " the recent lustre versions use a 1KB inode size by default and the >> default format options create 1 inodes for every 2.5 KB of MDT space" : >> I checked the inode

Re: [lustre-discuss] confused about mdt space

2020-04-01 Thread Mohr Jr, Richard Frank
> On Apr 1, 2020, at 3:55 AM, 肖正刚 wrote: > > For " the recent lustre versions use a 1KB inode size by default and the > default format options create 1 inodes for every 2.5 KB of MDT space" : > I checked the inode size is 1KB and in my online systems, as you said , > about 40~41% of mdt

Re: [lustre-discuss] confused about mdt space

2020-04-01 Thread 肖正刚
Hi, Please forget my first question, I made a mistake. For " the recent lustre versions use a 1KB inode size by default and the default format options create 1 inodes for every 2.5 KB of MDT space" : I checked the inode size is 1KB and in my online systems, as you said , about 40~41% of mdt

Re: [lustre-discuss] confused about mdt space

2020-03-31 Thread 肖正刚
Thanks a lot. I have two more questions: 1) Assume I consider the mdt space use the method described in lustre manual, by calculation, the metadata space is 400GB. After format(default option), about 160GB(40% of 400GB) preallocated for inodes, so the avalaible inodes number is less than

Re: [lustre-discuss] confused about mdt space

2020-03-31 Thread Mohr Jr, Richard Frank
> On Mar 30, 2020, at 10:56 PM, 肖正刚 wrote: > > Hello, I have some question about metadata space. > 1) I have ten 960GB SAS SSDs for mdt,after done raid10,we have 4.7TB space > free. > after formated as mdt,we only have 2.6TB space free; so where the 2.1TB space > go ? > 2) for the 2.6TB

[lustre-discuss] confused about mdt space

2020-03-30 Thread 肖正刚
Hello, I have some question about metadata space. 1) I have ten 960GB SAS SSDs for mdt,after done raid10,we have 4.7TB space free. after formated as mdt,we only have 2.6TB space free; so where the 2.1TB space go ? 2) for the 2.6TB space, what's it used for?