[Users] Is this "dd" operation harmful?

[Shu Ming]

Hi,

I found some "dd" operations were launched contiguously in my vdsm.log.
Is this harmful? How was this operation caused?

>From vdsm.log:

Dummy-51000::DEBUG::2012-10-11
15:38:57,243::__init__::1249::Storage.Misc.excCmd::(_log) 'dd
if=/rhev/data-center/6f6d4801-7447-48ea-b516-627d83e7801e/mastersd/dom_md/inbox
iflag=direct,fullblock count=1 bs=1024000' (cwd None)
Dummy-51000::DEBUG::2012-10-11
15:38:57,305::__init__::1249::Storage.Misc.excCmd::(_log) SUCCESS: <err>
= '1+0 records in\n1+0 records out\n1024000 bytes (1.0 MB) copied,
0.0388821 s, 26.3 MB/s\n'; <rc> = 0
Dummy-51000::DEBUG::2012-10-11
15:38:59,313::__init__::1249::Storage.Misc.excCmd::(_log) 'dd
if=/rhev/data-center/6f6d4801-7447-48ea-b516-627d83e7801e/mastersd/dom_md/inbox
iflag=direct,fullblock count=1 bs=1024000' (cwd None)
Dummy-51000::DEBUG::2012-10-11
15:38:59,375::__init__::1249::Storage.Misc.excCmd::(_log) SUCCESS: <err>
= '1+0 records in\n1+0 records out\n1024000 bytes (1.0 MB) copied,
0.0398412 s, 25.7 MB/s\n'; <rc> = 0
Dummy-51000::DEBUG::2012-10-11
15:39:01,383::__init__::1249::Storage.Misc.excCmd::(_log) 'dd
if=/rhev/data-center/6f6d4801-7447-48ea-b516-627d83e7801e/mastersd/dom_md/inbox
iflag=direct,fullblock count=1 bs=1024000' (cwd None)
Dummy-51000::DEBUG::2012-10-11
15:39:01,445::__init__::1249::Storage.Misc.excCmd::(_log) SUCCESS: <err>
= '1+0 records in\n1+0 records out\n1024000 bytes (1.0 MB) copied,
0.0393934 s, 26.0 MB/s\n'; <rc> = 0
Dummy-51000::DEBUG::2012-10-11
15:39:03,453::__init__::1249::Storage.Misc.excCmd::(_log) 'dd
if=/rhev/data-center/6f6d4801-7447-48ea-b516-627d83e7801e/mastersd/dom_md/inbox
iflag=direct,fullblock count=1 bs=1024000' (cwd None)
Dummy-51000::DEBUG::2012-10-11
15:39:03,515::__init__::1249::Storage.Misc.excCmd::(_log) SUCCESS: <err>
= '1+0 records in\n1+0 records out\n1024000 bytes (1.0 MB) copied,
0.0391104 s, 26.2 MB/s\n'; <rc> = 0

-- 
---
舒明 Shu Ming
Open Virtualization Engineerning; CSTL, IBM Corp.
Tel: 86-10-82451626  Tieline: 9051626 E-mail: shuming at cn.ibm.com or shuming at linux.vnet.ibm.com
Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District, Beijing 100193, PRC