lv-convert2cache v0.0.0 [11 Jan 2022] by Dominic
Description
Wrapper that converts an existing LVM logical volume (LV) into a read/write 'cache LV'.
Scenario
- an existing LV (on an existing VG) currently uses one or more PVs on one or more slower devices
- we want to make this LV faster by (optionally creating and) using a PV on a faster device as a cache
- of 2 possible cache methods, this uses dm-cache (dm-writecache only speeds up writing not reading)
- of 2 possible cache options, this uses cachevol (cachepool only better with cache data blocks & metadata on different devices)
Usage
lv-convert2cache [options] existing_VG/existing_LV new_PV "further_options_for_cache_creation"
Example
./lv-convert2cache timedicer/home /dev/sda1 "-c 512"
Options
-h see this help
-l see changelog
Kudos
The following pages were helpful in devising this utility -
https://blog.delouw.ch/2020/01/29/using-lvm-cache-for-storage-tiering/
https://manpages.ubuntu.com/manpages/focal/man7/lvmcache.7.html
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_logical_volumes/enabling-caching-to-improve-logical-volume-performance_configuring-and-managing-logical-volumes
Changelog
0.0.0 [11 Jan 2022] - Initial version
Download lv-convert2cache
Donation
I have provided this software free gratis and for nothing. If you would like to thank me with a contribution, please let me know and I will send you a link. Thank you!
My Other Sites
- TimeDicer - Onsite/offsite data backup for Windows (uses rdiff-backup)
- Finding a 4D Backup Solution
- Web Scraping How To - extracting data from web sites
My Programs
Here is a selection of some (other) programs I have written, most of which run from the command line (CLI), are freely available and can be obtained by clicking on the links. Dependencies are shown and while in most cases written for a conventional Linux server, they should run on a Raspberry Pi, and many can run under Windows using Windows Subsystem for Linux (WSL) or Cygwin. Email me if you have problems or questions, or if you think I could help with a programming requirement.
Backup Utilities
- TimeDicer - Onsite/offsite data backup for Windows (uses rdiff-backup) [ GNU/Linux & MS Windows©: 2008-20 ]
- rdiff-backup-regress - GNU/Linux script to regress an rdiff-backup archive. [ GNU/Linux: 2012-16 ]
Debian/Ubuntu kernel and LVM Utilities
- kernel-remove - GNU/Linux script to list the installed GNU/Linux kernels in a Debian-based distro (e.g. Ubuntu), and can be used to remove an unwanted kernel and related packages, updating grub appropriately. [ GNU/Linux-Debian/Ubuntu: 2010-15 ]
- lvm-usage - GNU/Linux script to show available disk space and how it is used; run as cron job to warn if usage is above a set percentage. Provides additional information if LVM is in use. [ GNU/Linux-Debian/Ubuntu: 2012-21 ]
- lvm-delete-snapshot - GNU/Linux script to remove LVM snapshot that has been left over by another process. [ GNU/Linux-Debian/Ubuntu: 2012-21 ]
- netnames - GNU/Linux script shows current name, biosdevname and 'predictable name' of network device - helps with network device name scheme migration. [ GNU/Linux-Debian/Ubuntu: 2020-20 ]
Dellmont - VoIP and Mobile Phone Account Utilities
- dellmont-credit-checker - GNU/Linux script to check credit balance on many Dellmont / Finarea / Betamax portals such as voicetrading.com and voipdiscount.com. [ GNU/Linux: 2008-19 ]
- sms-sender - GNU/Linux script to send text messages using Dellmont’s voicetrading.com. [ GNU/Linux: 2012-18 ]
- get-vt-cdrs - GNU/Linux script to download CDRs (call detail records) from Dellmont’s voicetrading.com or voippro.com. [ GNU/Linux: 2010-19 ]
- saynoto0870 - For UK, a GNU/Linux script which performs automated lookup of the www.saynoto0870.com database, finding cheap or free geographic number replacements for expensive non-geographic (087* or 084*) numbers. [ GNU/Linux: 2012-12 ]
Miscellaneous Programs
- sleepwalker - Windows© program which can be run from a remote machine to 'wake up' a Windows© machine behind a router, wait for it to start and then initiate Remote Desktop session. [MS Windows©: 2008-16]
- relay-enforcer - GNU/Linux program enabling a postfix-based mail server relaying to Gmail to act on reports from Gmail about blocked emails. [ GNU/Linux: 2016-21 ]
- bind9-resolved-switch - GNU/Linux program for switching permanently between using bind9 or systemd-resolved as the system DNS resolver. [ GNU/Linux: 2016-20 ]
- unlock - GNU/Linux remote program for easy entering of decrypt passphrase on a remote machine which has root dm-crypt+LUKS. [ GNU/Linux: 2017-18 ]
- wifi-updown - GNU/Linux program to take down wifi interface if there is a working wired interface (or restore wifi if not). [ GNU/Linux: 2018-20 ]
- routefix - GNU/Linux program to restore a default ip traffic route if there is none such (e.g. after running wifi-updown). [ GNU/Linux: 2018-19 ]
- pdf-compress - GNU/Linux program to create smaller b/w pdf file from an original large pdf file, especially when original resulted from scanning. [ GNU/Linux: 2016-20 ]
- form-extractor - GNU/Linux program to extract form tags from a web page or downloaded file. [ GNU/Linux: 2012-20 ]
- mythic-dns-sync - GNU/Linux program to update DNS record at mythic-beasts.com to match local external ip. [ GNU/Linux: 2016-20 ]
- tiny-device-monitor - GNU/Linux program to test webpages (including password-protected) or machines to check they are live; use as a cron job for your own websites, for hardware presenting a webpage, or for any machines with a presence on your local LAN or on the internet. [ GNU/Linux: 2009-19 ]
- dutree - GNU/Linux program to show a tree-style list of files and directories at the specified location and greater than the specified size (default 1GB). [ GNU/Linux: 2012-20 ]
- Accounts - Multi-business multi-currency accounting software, uses Access [MS Windows©: 1996-2021]
- Rents Program - Residential lettings/landlord front office program, with many special features for UK market [MS Windows©: 1991-2021]
If you have a comment or question, please email me, thank you.