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Subject: RE: FileSystem block size
Date: Tue, 12 Dec 2006 23:35:13 -0800
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E9D9137@onstor-exch02.onstor.net>
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Thread-Topic: FileSystem block size
thread-index: Acceayaft8GAwxS6R0mOHdH6HYraFQAG+P4Y
References: <BB375AF679D4A34E9CA8DFA650E2B04E01B70942@onstor-exch02.onstor.net>
From: "Henry Lau" <henry.lau@onstor.com>
To: "Yasuhiro Murata" <yasuhiro.murata@onstor.com>,
	"dl-cstech" <dl-cstech@onstor.com>

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"8knondir, 1knondir, 8kdir, 1kdir" are all buffer caches usage.

8knondir  - full size non-directory bufs
inodebuf  - full size inode bufs
8kdir     - full size directory bufs
1knondir  - compact non-directory bufs
1kdir     - compact directory bufs

Things related to inode, we use inode buf. Related to directory, if it =
is less than 1K block, use compact, otherwise use 8kdir. For =
nondirectory such as extents/quota, use 8knondir/1knondir(compact).

Thanks,

Henry

-----Original Message-----
From: Yasuhiro Murata
Sent: Tue 12/12/2006 7:59 PM
To: dl-cstech
Subject: FileSystem block size
=20
Hello folks,

I think ONStor's filesystem(EFS/StorFS) have 1K block and 8K block.
For what type of data 1K block is used?
For what type of data 1K block is used?

My understandings are followings,
  To save the User Data, only 8K block is used.
  To save the Journaling, only 1K block is used.
  To save Meta Data, both 8K and 1K bolks are used.

Is my understanding correct?

I need to explain Yahoo-J how to check the Bobcat's memory status.
I think the command "filesystem show stats cache" is useful for them.

"8knondir, 1knondir, 8kdir, 1kdir" appeare in the "Type" field, when I =
issue this command.

Any advice would be appreciated.

Best Regards,
Yasuhiro Murata

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<P><FONT SIZE=3D2>&quot;8knondir, 1knondir, 8kdir, 1kdir&quot; are all =
buffer caches usage.<BR>
<BR>
8knondir&nbsp; - full size non-directory bufs<BR>
inodebuf&nbsp; - full size inode bufs<BR>
8kdir&nbsp;&nbsp;&nbsp;&nbsp; - full size directory bufs<BR>
1knondir&nbsp; - compact non-directory bufs<BR>
1kdir&nbsp;&nbsp;&nbsp;&nbsp; - compact directory bufs<BR>
<BR>
Things related to inode, we use inode buf. Related to directory, if it =
is less than 1K block, use compact, otherwise use 8kdir. For =
nondirectory such as extents/quota, use 8knondir/1knondir(compact).<BR>
<BR>
Thanks,<BR>
<BR>
Henry<BR>
<BR>
-----Original Message-----<BR>
From: Yasuhiro Murata<BR>
Sent: Tue 12/12/2006 7:59 PM<BR>
To: dl-cstech<BR>
Subject: FileSystem block size<BR>
<BR>
Hello folks,<BR>
<BR>
I think ONStor's filesystem(EFS/StorFS) have 1K block and 8K block.<BR>
For what type of data 1K block is used?<BR>
For what type of data 1K block is used?<BR>
<BR>
My understandings are followings,<BR>
&nbsp; To save the User Data, only 8K block is used.<BR>
&nbsp; To save the Journaling, only 1K block is used.<BR>
&nbsp; To save Meta Data, both 8K and 1K bolks are used.<BR>
<BR>
Is my understanding correct?<BR>
<BR>
I need to explain Yahoo-J how to check the Bobcat's memory status.<BR>
I think the command &quot;filesystem show stats cache&quot; is useful =
for them.<BR>
<BR>
&quot;8knondir, 1knondir, 8kdir, 1kdir&quot; appeare in the =
&quot;Type&quot; field, when I issue this command.<BR>
<BR>
Any advice would be appreciated.<BR>
<BR>
Best Regards,<BR>
Yasuhiro Murata<BR>
</FONT>
</P>

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