User manual QUANTUM INFINITE FILE LIFE 5.3 REV A

[. . . ] Infinite File Life AMASS Version 5. 3 August 2002 6-00323-01 Rev A Trademark Notice ADIC, AMASS, CentraVision, DAS, DataMgr, FileServ, and VolServ are either trademarks or registered trademarks of Advanced Digital Information Corporation. All other product names and identifications are trademarks or registered trademarks of their respective owners. Copyright Notice © 1996-2002 ADIC® All rights reserved. No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, without the express written permission of: ADIC 11431 Willows Road, NE PO Box 97057 Redmond, WA 98073-9757 USA Phone: 425-881-8004 FAX: 425-881-2296 U. S. Government Rights Restricted Use, duplication, or disclosure of either the software or documentation is subject to restrictions set forth by the U. S. [. . . ] Note that the mqv score also includes drive characteristics which obviously depend on the individual drive. Therefore, if the drive itself is suspect, that will be taken into account for an individual volume score. 6-00323-01 Rev A 2-9 IFL Operations Task 2. volreplace The ifldaily script then runs the volreplace command to replace volumes that have been marked as verification failed or replacement due depending on the options specified for volreplace. The default IFL Configuration File specifies the "-S r" option to volreplace. This tells volreplace to replace volumes marked as replacement due. The volumes are sorted by their scores in determining replacement order. During replacement, the contents of a degraded volume are copied to healthy media and the replaced volume is removed from service. Volumes can only be marked as replacement due by running volmedia manually. This was provided so that a AMASS administrator could check the list of volumes that were marked as verification failed and manually mark those volumes to be replaced. If we pass the "-S f" option to volreplace, it will automatically replace volumes marked as verification failed. mqverify The ifldaily script then runs mqverify. The mqverify script reads the volmedia database to determine the volumes marked as verification due. The flagged volumes are tested in turn loading the volume into a drive. Reads are performed on error blocks previously found on the volume or the whole volume depending on the options passed to mqverify. This is called the Media Quality Verification (MQV) process. Sense data is examined from the drives and any additional errors are recorded as bad error blocks. Then mqverify, as volmedia -r did, computes and compares factor values against limits defined in the IFL Configuration File. 2-10 6-00323-01 Rev A IFL Operations In this case when one of the factors exceeds a limit, AMASS marks it inactive, writes a message to the syslog, and marks the volume as verification failed. In addition, a mqv score is calculated and checked against a limit defined in the IFL Configuration File. Note that we assume that a drive has passed a drivechk and can be used for mqverify. Create Volume Lists The ifldaily script then uses vmlist, which reads the volmedia database and creates lists for the system administrator. These lists are reminders to make volumes available for verification, authorize replacement of volumes that have failed verification, and to move non-resident media to or from off-site storage. The lists are stored in one or more of the following files: File Path Name of List Description /usr/amass/ifl/lists replacement_indicated Candidate for replacement replacement_due replacement_done nonres_fetch nonres_return verify_online verify_offline Approved for replacement Volume replaced To be retrieved from offsite storage To be returned to offsite storage No action, information only Bring volume online 6-00323-01 Rev A 2-11 IFL Operations Task 5. Send List Notifications The ifldaily script can be configured to send the lists to an AMASS administrator via email (mailx). [. . . ] A volgroup assignment: · A numeric value, 1 through 2047 · The space pool (SP) 4-8 6-00323-01 Rev A Parameters Defined Processing Parameters The following table describes Processing Parameters: Parameter drive valid #days list recipient Processing Description Drive will be valid for #days after it has been verified by the drivechk command. Email list to specified addresses. send Lists include: dai[ly] offl[ine] nonr[es] repl[ace] verif[y] sess[ion] star[t] time [day. . . ] stop time [day. . . ] ifldaily log file Offline volume list Nonresident volume list Replacement state list Verification state list IFL session start time IFL session stop time 6-00323-01 Rev A 4-9 Parameters Defined Description of Processing Parameter Values The following table describes the Processing Parameter values. Parameter day Description The valid entries are as follows: sun[day] mon[day] tue[sday] wed[nesday] thu[rsday] fri[day] sat[urday] dai[ly] weekd[ay] weeke[nd] time 24-hour clock (local) time (hhmm). 4-10 6-00323-01 Rev A Parameters Defined Threshold Parameters Threshold Parameters are used to determine when volumes need to be verified or replaced. When used as verification parameters, Threshold Parameters are used to change the state of a volume to "Verification due" as defined in Figure 1-3 AMASS IFL Volume State. When used as replacement parameters, Threshold Parameters are used to change the state of a volume to "Verification failed" as defined in Figure 1-3 AMASS IFL Volume State Generic Threshold Parameters The following table describes Generic Threshold Parameters. Parameter repl[ace] Description Replace when the factor [TOTAL] is greater than or equal to the value. [. . . ]