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You Should Know:
1. Connectivity Issues
- Commands for Linux:
– `rescan-scsi-bus.sh` to rescan SCSI buses and detect new LUNs.
– `lsscsi` to list SCSI devices.
– `dmesg | grep -i scsi` to check SCSI-related kernel messages. - Commands for Windows:
- Open Command Prompt and run `diskpart` -> `rescan` to detect new disks.
– `Get-Disk` in PowerShell to list available disks.
2. Performance Issues
- Linux Commands:
– `iostat -x 1` to monitor I/O statistics.
– `mpathconf` to configure multipathing.
– `lsblk` to view block devices and their mount points. - Windows Commands:
– `Get-PhysicalDisk` in PowerShell to check disk health.
– `Get-IscsiConnection` to view iSCSI connections.
3. Storage Capacity Issues
- Linux Commands:
– `df -h` to check disk usage.
– `lvextend` to extend logical volumes. - Windows Commands:
– `Resize-Partition` in PowerShell to resize partitions.
– `Get-Volume` to check storage usage.
4. Data Corruption & Integrity Issues
- Linux Commands:
– `fsck /dev/sdX` to check and repair file systems.
– `mdadm –detail /dev/mdX` to check RAID array status. - Windows Commands:
– `chkdsk /f` to repair file system errors.
– `Get-StorageReliabilityCounter` to check disk health.
5. Security & Access Issues
- Linux Commands:
– `iscsiadm -m session` to view active iSCSI sessions.
– `cat /etc/iscsi/initiatorname.iscsi` to check iSCSI initiator name. - Windows Commands:
– `Get-IscsiTarget` to view iSCSI targets.
– `Set-IscsiChapSecret` to configure CHAP authentication.
6. Backup & Replication Failures
- Linux Commands:
– `rsync -avz` for file synchronization.
– `tar -cvzf` to create compressed backups. - Windows Commands:
– `wbadmin start backup` to initiate a backup.
– `Get-WBJob` to check backup job status.
What Undercode Say:
SAN troubleshooting requires a mix of hardware checks, configuration audits, and software tools. Regularly monitor storage health using commands like iostat, fsck, and Get-PhysicalDisk. Ensure proper zoning, LUN masking, and multipathing configurations. Always keep firmware and drivers updated to avoid compatibility issues. For performance bottlenecks, balance I/O loads and optimize queue depths. Regularly clean up snapshots and logs to prevent storage overflows. Finally, secure your SAN by enforcing proper authentication and access controls.
Useful Resources:
References:
Reported By: Shamseer Siddiqui – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
