User manual TANDBERG BAKSTOR

[. . . ] INSTALLATION AND ADMINISTRATION MANUAL TANDBERG DATA ASA P. O. Box 134 Kjelsås N-0411 OSLO, NORWAY Phone + 47 22 18 90 90 Telefax + 47 22 18 95 50 © Tandberg Data ASA Rev. 03 September 2005 All rights reserved. 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. [. . . ] The name of the slice must be entered twice to confirm. Click the ACCEPT button to delete the slice. 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. The snapshots on a BakStor are both readable and writeable. 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 BakStor has two methods for Snapshots: Scheduled and Instant 4. 4. 1 Creating Instant Snapshots To create an instant snapshot, choose Snapshot ?Create a snapshot The following information must be provided: Slice name. This is the amount of disk space the snapshots starts with. The size is specified as a percentage of the slice to take snapshot of. If taking a snapshot of a disk slice of size 500GB and 10% is specified 50GB will initially be reserved for the snapshot. If the snapshot name is not defined the slice-name date and time will be used as the name of the snapshot Then click the ACCEPT button to create the snapshot. BakStor Installation and Administration Manual 35 Tandberg Data Figure 4-11 Configuring an instant snapshot 4. 4. 2 Scheduling Snapshots Snapshots can also be scheduled to run at a given time. To create a scheduled snapshot choose Snapshot ?Schedule a snapshot The following information will be needed Slice name. This is the amount of disk space the snapshots starts with. The size is specified as a percentage of the slice to take snapshot of. [. . . ] This daemon allows iSCSI targets and iSCSI initiators to register with it and thus providing a single point to inquary for information regarding iSCSI devices. Using such a daemon simplyfies the configuration of iSCSI initiators in a setup with multiple iSCSI targets since the iSCSI initiator only has to be configured to inquary the iSNS instead of being configured with the IP address of every iSCSI target 58 BakStor Installation and Administration Manual 7 Maintenance 7. 1 Update Code The firmware in the BakStor can be upgraded can be upgraded to accommodate new features. Place the file containing the upgraded firmware in a directory on your computer. Show license info Choose "Browse" and locate the file containing the firmware. [. . . ]