Gentoo Archives: gentoo-user

From: Neil Bothwick <neil@××××××××××.uk>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Hard drive storage questions
Date: Tue, 28 Apr 2015 15:25:02
Message-Id: 20150428162448.160e1683@digimed.co.uk
In Reply to: Re: [gentoo-user] Hard drive storage questions by Alan McKinnon
1 On Tue, 28 Apr 2015 17:01:49 +0200, Alan McKinnon wrote:
2
3 > When you use only LVM for this and nothing else, you have a high risk of
4 > losing everything if one disk fails. Why? Because LVM decides itself
5 > which extent it will put data on. Maybe a whole file is on one disk,
6 > maybe it's spread across two, because the software is designed so that
7 > you don't have to be concerned with that. The only thing that LVM does
8 > is expand your storage space as a single volume and make it easier to
9 > shuffle things around without having to backup/repartition/restore.
10
11 An alternative is to create a new volume group on the new disk and mounts
12 PVs at various points in your home directory. That way you get the extra
13 space and much of the flexibility without the risk of a failure on a
14 single drive taking out data on both. However, if you are concerned about
15 data loss, you should be using RAID t a minimum, preferably with an error
16 detecting filesystem.
17
18 > Personally, I like the ZFS approach and do it all in software, catching
19 > errors that RAID misses.
20
21 The same is also possible with BTRFS, including built in RAID. RAID5 in
22 btrfs is expermiental, but its RAID1 is like RAID5 in some ways, such as
23 giving the capacity of n-1 disks and tolerating a single disk failure.
24
25
26 --
27 Neil Bothwick
28
29 PC DOS Error #04: Out of disk space. Delete Windows? (Y)es (H)ell yes!

Replies

Subject Author
Re: [gentoo-user] Hard drive storage questions Rich Freeman <rich0@g.o>
[gentoo-user] Re: Hard drive storage questions walt <w41ter@×××××.com>
Re: [gentoo-user] Hard drive storage questions Alan McKinnon <alan.mckinnon@×××××.com>