1,085 reputation
413
bio website valedon.co.uk
location Derbyshire, United Kingdom
age 59
visits member for 2 years, 8 months
seen 20 hours ago

I've worked in IT for about 30 years (since 1980) starting when I was doing research at university and got the role of Computer Manager in the Physics department. I've been at IT Manager for much of my career, but in recent years have done more software development (SQLserver, C#, VB.Net, MVC, ASP, etc) than IT administration. I've also been a Project Manager (Prince 2) and a software development manager.

Most of my professional work has been with Microsoft operating systems (currently Windows 8 at home) but I've kept up an interest in Linux throughout.

At work, I currently develop web applications using C#, jQuery/javascript and MS SQL.

At home, in addition to several Windows laptops, I currently maintain 2 systems running Linux. Both is running Debian + MythTV; one is used a Personal Video Recorder and general filestore (it has about 9.5Tb of disks attached). The other just acts as a player and alternates between Debian, for MythTV, and Windows 7, for iPlayer, BlinkBox, etc; it connects only by a WiFi connection which is configure to start before login so it also holds the essential config backup from the main server. Both use HD TVs as monitors. In the past, I've configured my home systems to use soft RAID (md devices) and currently have the PVR system using LVM as it allows partitions to span drives (and is easily reconfigurable when I need a bit more space).

I'd like to do a bit more with Android as I have a couple of tablets - my phones are a Blackberry and an iPhone! - and also get back to my Astronomy hobby (I haven't had my telescope out for a couple of years!

Married, with several cats, but no kids!


Mar
25
awarded  Nice Answer
Mar
17
comment What are the overheads of using multiple smaller raid devices versus partitioned raid devices as physical volumes?
Having got into the habit of using separate VGs (and moving them occasionally), I've since created them for other things, e.g. keeping all GIT repositories separate. I am thinking of merging some now as the separation serves less purpose since I changed hardware, but I currently have a few which are only a few dozen Gigabytes, which is wasteful of a 700Gb PV, hence my question.
Mar
17
comment What are the overheads of using multiple smaller raid devices versus partitioned raid devices as physical volumes?
Mostly historical. Original VGs were OS, home directories, MythTV recordings, ISO+disk images and backup. OS/home separation was from install. Recordings were separate simply to keep a better handle on usage and allow them to be moved to bigger disks as I changed hardware. The ISO and virtual disk images were put in their own VGs so they could be on faster physical disks (I intended to put them on SSDs, but never got around to it). Backup was separate to put VG on 2 mirrored USB drives - keeping a long term backup simply meant unplugging a drive, replacing it and letting the mirror rebuild.
Mar
16
comment What are the overheads of using multiple smaller raid devices versus partitioned raid devices as physical volumes?
@Bratchley I didn't think that multilevel partitioning would have a noticeable performance impact but was looking for confirmation. This is a home system and they are local disks. Over the past few years, I've been in the habit of separating different sets of files onto different volume groups, but as my setup has evolved, the majority of raid (md) devices are about 700Gb in size (after partitioning the underlying 3Tb disks into 12). I'd rather keep some of the volume groups significantly smaller than this, hence the sub-partitioning of the raid devices. Thanks for the input.
Mar
14
asked What are the overheads of using multiple smaller raid devices versus partitioned raid devices as physical volumes?
Mar
6
answered What is the correct way to set up sw RAID1 so either drive boots?
Mar
5
comment Can BTRFS stripe RAID arrays?
@Bratchley thank for the edit - comes from typing late and night, cutting and pasting and poor proofreading...
Mar
5
comment Can BTRFS stripe RAID arrays?
That's something that surprised me. Although BTRFS is included in many (most?) distros as standard, it's not really considered "stable". Meanwhile, ZFS, which seems much more stable, mature and functional is still an add-on (although I suspect part of this is use of none-free code somewhere). I think I'll stick with ext4/lvm2/md for now (as it's really stable/tested/etc and I understand what it's doing) and just run the others on test systems. I'd still be interested to know if BTRFS can create the filesystem I'd like to use.
Mar
5
asked Can BTRFS stripe RAID arrays?
Nov
4
awarded  Popular Question
Jul
18
awarded  Yearling
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17
awarded  Caucus
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17
awarded  Constituent
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awarded  Scholar
Nov
21
accepted xfce4 loses title bars on all windows
Jul
18
awarded  Yearling
Feb
6
comment Can I create a software RAID 1 with one device
The options to cp handle preserving links (-d), mode, ownership and timestamps (-p), doing it recursively (-R) and staying on one filesystem (-x), but I think you may be right about hard links and extended attributes.
Feb
6
revised Can I create a software RAID 1 with one device
added 266 characters in body
Feb
6
answered Can I create a software RAID 1 with one device
Jan
25
comment LVM with SSD and SATA hard disks
As far as I know, no. LVM just treats a Volume Group as a contiguous block of space and doesn't care what the underlying physical devices are.