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Date: Wed, 10 Mar 2010 14:34:48 +0800 (CST)
From: "Busby.Cheung" <chaimvy@163.com>
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Subject: [linux-lvm] lvm2's problem or device-mapper's?
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Hi All,
         I used 'lvcreate' cmd to create a logical-volume named 'lv-test', belongs to volume group 'vg00'.
        Then I gave the lv-test  big IO like:'dd if=/dev/zero of=/dev/mapper/lv-test bs=4K'.  while it was in this big IO, I use 'lvcreate' cmd to create a new lv using lv-test's vg 'vg00'. it take a long time to do it. I found it finish util the 'dd' ended.
        Is it caused by some functions like 'suspend'  in VG, the IO suspend  can't be done in a very quick way?
       I don't know what cause the problem, 'lvcreate' a new LV very slowly while big IO on another LV in the same VG.
      Anyone can help me? Thank you very much.
 
best regards,
Bubsy Cheung
         
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<DIV>Hi All,</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I used 'lvcreate' cmd to create a logical-volume named 'lv-test', belongs to volume group 'vg00'.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Then I&nbsp;gave the lv-test &nbsp;big&nbsp;IO like:'dd if=/dev/zero of=/dev/mapper/lv-test bs=4K'.&nbsp; while it was in this big IO, I use 'lvcreate' cmd to create a new lv using lv-test's vg 'vg00'. it take a long time to do it. I found it finish util the 'dd' ended.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Is it caused by some functions like 'suspend'&nbsp; in VG, the IO suspend&nbsp; can't be done in a very quick way?</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I don't know what cause the problem, 'lvcreate' a new LV very slowly while big IO on another LV in the same VG.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Anyone can help me? Thank you very much.</DIV>
<DIV>&nbsp;</DIV>
<DIV>best regards,</DIV>
<DIV>Bubsy Cheung</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </DIV><br><br><span title="neteasefooter"/></span>
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