iSCSI targets missing after SC host reboot under existence of snapshot

After the reboot of SC host, some (not all) iSCSI targets for EBS are missing when snapshots are existing.
The number of missing targets is unsystematic (see log below).
When there's no snapshot in SC, all the targets are created.

Thanks.

system:
Eucalyptus : 2.0.2
Host OS : CentOS5.5
Installed : binary(eucalyptus-2.0.2-centos-x86_64.tar.gz)
Hypervisor : kvm
VNET_MODE : MANAGED
CLC/CC/Walrus/SC in one host

# euca-describe-volumes
VOLUME vol-5B7B0621 3 cluster3 available 2011-04-20T23:24:33.058Z
VOLUME vol-5C440636 2 cluster3 available 2011-04-20T23:24:19.77Z
VOLUME vol-5667060B 4 cluster3 available 2011-04-20T23:24:45.817Z
VOLUME vol-5BAC0626 4 cluster3 available 2011-04-20T23:24:01.321Z
# euca-describe-snapshots
SNAPSHOT snap-5AF90612 vol-5BAC0626 completed 2011-04-20T23:25:58.328Z 100%

[reboot SC host]

# tgtadm --mode target --op show | grep Target
Target 631: iqn.2009-06.com.eucalyptus.cluster3:store631
Target 632: iqn.2009-06.com.eucalyptus.cluster3:store632
Target 634: iqn.2009-06.com.eucalyptus.cluster3:store634
-> 1 iSCSI target missing

[delete snapshot]
# euca-describe-snapshots
[reboot SC host]

# tgtadm --mode target --op show | grep Target
Target 631: iqn.2009-06.com.eucalyptus.cluster3:store631
Target 632: iqn.2009-06.com.eucalyptus.cluster3:store632
Target 633: iqn.2009-06.com.eucalyptus.cluster3:store633
Target 634: iqn.2009-06.com.eucalyptus.cluster3:store634
-> all targets

[create snapshot]
# euca-describe-snapshots
SNAPSHOT snap-5BA80628 vol-5B7B0621 completed 2011-04-21T00:24:44.254Z 100%
[reboot SC host]

# tgtadm --mode target --op show
Target 632: iqn.2009-06.com.eucalyptus.cluster3:store632
-> 3 iSCSI targets missing