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LVM command help
LVM command help Available lvm commands: Use ‘lvm help ‘ for more information dumpconfig Dump active configuration formats List available metadata formats help Display help for commands lvchange Change the…
How to rescan Fiber Channel and SCSI storage
You can force a rescan for SCSI drives like this: echo “- – -” >/sys/class/scsi_host/host Same for FiberChannel: echo “1″ >/sys/class/fc_host/host Also, you can reboot the system to Rescan.
HBA card troubleshooting
HBA card troubleshooting HBA card is configuration is very important and if you can’t configure HBA card, then system won’t see your storage and you will have big issues. Make…
How to diffierenate from Local disks vs SAN
How to differentiate from Local disks vs SAN Some times system admins get confused that disks are from SAN or local disk. Please check the following information and this server…
Linux file system issue
Linux file system issue Once we have created the partition, we have to tell kernel that new partition has been added otherwise when you try to format, you will get…
How to find WWN numbers on Linux
How to find WWN numbers on Linux When there is a storage problem or wants to find more information about storage, you may need to provide WWN number to storage…
Analyzing Server Performance
Analyzing Linux Server Performance If there is an issue with server performance, you need to follow fundamental steps to approach the problem. Here are few fundamental steps: 1. CPU bottlenecks…
Fdisk vs Parted command
Fdisk vs Parted command Using fdisk command, you can create, delete and check partitions. When you use parted you can resize and copy partitions as well. Also, you can easily…
NFS Stale File Handle error
Most of you might have seen this error messages in the past. The reason for the error is that whenever directory reference is removed by nfs server and when client…
How to manage iSCSI volumes and devices on Linux
How to manage iSCSI volumes on Linux iSCSI is a good choice for small companies who don’t have big budget fiber channel storage solution. Basically SCSI commands signal go through…