Category Archives: File System

FileSystem

Certificate Signing Request

Certificate Signing Request In public key infrastructure (PKI) systems, a certificate signing request (also CSR or certification request) is a message sent from an applicant to a certificate authority in order to apply for a digital identity certificate. The most … Continue reading

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Linux File System Recovery

Scenario: If our  file is about to reach 100% & we don’t have underlying LVM. Solution: Moving data form disk 1 to New Disk { disk2 } Please find below Step’s involve in this activity Step1: Add a new Hard … Continue reading

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Storage Migration

Storage Migration Activity: Scenario: Storage Migration from EMC Clarion { Old Storage } to EMC V-Max { New Storage }. We have asked storage team to allocate 4 new storage LUN’s as per the below mentioned size. • 2 Lun’s … Continue reading

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Differences between Ext2, Ext3 and Ext4 file systems

Differences between Ext2, Ext3 and Ext4 file systems It is always a question in my mind what are the basic difference between ext2, ext3 and ext4 file systems & why we are only able create to four primary partition. So … Continue reading

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Rescan LUN’s without rebooting RedHat 6 /Cent OS

# ls /sys/class/fc_host host0  host1  host2  host3 # echo “1” > /sys/class/fc_host/hostH #echo “c t l” >  /sys/class/scsi_host/hostH/scan where H is the HBA number, c is the channel on the HBA, t is the SCSI target ID, and l is … Continue reading

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Fastest Remote Directory rsync over ssh CentOS /Fedora/RHEL/Ubuntu

rsync -aHAXxv –numeric-ids –delete –progress -e “ssh -T -c arcfour -o Compression=no -x” user@: The fastest remote directory rsync over ssh archival This creates an archive that does the following: rsync:: (Everyone seems to like -z, but it is much … Continue reading

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Add a new LUN to live Multipath environment CentOS/RHEL

Rescan SCSI bus:# /usr/bin/rescan-scsi-bus.sh Lookup the names of newly available disks# lsblk Lookup WWID for each newly discovered disk:# scsi_id –page=0x83 –whitelisted –device=/dev/ Add those WWIDs to blacklist_exceptions and multipaths in /etc/multipath.conf. Reload multipathd and check the disks are properly configured:# /etc/init.d/multipathd reload# lsblk

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