User manual TANDBERG BAKSTOR

[. . . ] Box 134 Kjelsås N-0411 OSLO, NORWAY Phone + 47 22 18 90 90 Telefax + 47 22 18 95 50 © Tandberg Data ASA Rev. No part of this publication 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 prior written consent of Tandberg Data ASA. This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules and based on the standard of the Voluntary Control Council for Interference by Information Technology Equipment (VCCI). These limits are designed to provide the reasonable protection against harmful interference in a residential installation. [. . . ] Make a note of the slot number of the failed disk drive. 30 BakStor Installation and Administration Manual Tandberg Data Figure 4-6 Disk status showing a failed disk in the RAID. In this case the disk in slot 0 has failed. 4. 3. 1 Repairing a RAID First the failed disk drive needs to be removed from the BakStor. To configure the BakStor to expect a faulty disk drive to be removed, choose RAID menu ?Remove faulty drive All currently failed disk drives will appear in the Select slot pull-down menu. Choose the disk drive to be removed and click the ACCEPT button. Figure 4-7 Selecting a faulty disk drive to be removed Once accepted, it is safe to physically remove the faulty drive. Take great care to ensure that the disk drive is removed from the correct hardware slot position. BakStor Installation and Administration Manual 31 Tandberg Data Caution!Removal of incorrect disk drive will cause data to be permanently lost. Once the failed disk drive has been removed insert the replacement disk drive. After installing the replacement disk drive the BakStor must be configured to make use of the new disk drive. Scan for drives Figure 4-8 Replacement disk drive detected The replacement disk drive can then be configured into the RAID. Add spare drive to RAID 32 BakStor Installation and Administration Manual Tandberg Data Figure 4-9 Selecting a disk drive to be inserted into the RAID Notice that only disk drives currently not assigned to any RAID will appear in the Select drive slot pull-down menu. Once the new disk drive has been successfully added to RAID the rebuild process will start automatically. The progress of the rebuild process can be monitored in the "view RAID Info" and "view drive info" screens. BakStor Installation and Administration Manual 33 Tandberg Data 4. 3. 2 Deleting a RAID Before deleting a RAID ensure that all data has been removed from the slices located on the RAID set. Caution!Deleting a RAID set will cause any data on the RAID set to be permanently lost. Then delete any disk slice or virtual tape slice located on the RAID set. Delete a RAID Choose the correct RAID set to delete and choose "Yes" for "Are you sure". Then click the ACCEPT button to delete the RAID. Figure 4-10 Confirming the intention to delete a RAID 34 BakStor Installation and Administration Manual Tandberg Data 4. 4 Snapshots A snapshot makes it possible to take a point-in-time image of a disk slice. It is not a full copy of the disk slice, rather it is an image of what the disk slice looked like at the moment the snapshot was taken. As the original disk slice is modified the snapshot can be used to "go back in time" to the time the snapshot was taken. A snapshot can be exported and mounted on an iSCSI initiator computer just like a regular disk slice. Since the only disk space used by a snapshot is the parts of the slice that has changed on either the original slice or the snapshot, the snapshot and the original slice share the majority of the disk space. However, as the difference between the original slice and the snapshot increases the amount of space used for the snapshot will increase. If the BakStor runs of space to accommodate the growth of a snapshot the snapshot will become unavailable. The BakStor will intelligently allocate space for the snapshot on the RAID sets most suitable. [. . . ] The service is automatically started when the BakStor starts, this menu options allows the service to be manually started / restarted at a later point should this be needed. 6. 4. 2 Stopping the iSCSI Service Choose Configuration ?Stop iSCSI Service This option allows for a stop of the iSCSI service without shutting the BakStor down. iSCSI service is stopped the slices can no longer be accessed from an iSCSI initiator, but the webinterface is still accessable 6. 4. 3 Configuring iSCSI iSNS server Choose Configuration ?Set iSCSI iSNS server This options allows for the configuration of an iSNS nameserver. [. . . ]