How to check a Non vanilla Index

IDS version: 9.40 FC4 OS: Sun Solaris 9 Index schema create index "informix".messagequeue_ix4 on "informix".messagequeue (singleton,type,channel) using btree in efdbefs2009idx2dbs ; Fields: singleton "informix".boolean default 'f' not null type varchar(10) channel varchar(255) not null Prelude: The instance crashed today morning complaining that this index was corrupt. When I run a oncheck -cIDn on the table, I get the below comments for this index. Index messagequeue_ix3 Index fragment in DBspace efdbefs2009idx2dbs Index messagequeue_ix3: Non vanilla index. data crosschecking not enabled Any idea on how to check this index or did it actually check the index and it is just an output message. Your help or suggestion is appreciated. Thank you, Kannan ***** Jackson Hewitt Email Disclaimer ***** The sender believes that this E-mail and any attachments were free of any virus, worm, Trojan horse, and/or malicious code when sent. This message and its attachments could have been infected during transmission. By reading the message and opening any attachments, the recipient accepts full responsibility for taking protective and remedial action about viruses and other defects. The sender's business entity is not liable for any loss or damage arising in any way from this message or its attachments. Privileged/Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such case, you should destroy this message and kindly notify the sender by reply email.