1 |
-----BEGIN PGP SIGNED MESSAGE----- |
2 |
Hash: SHA1 |
3 |
|
4 |
hi, |
5 |
|
6 |
|Well, using a Raid 1 in that instance probably isn't the best |
7 |
solution. Raid |
8 |
|1 arrays are really best used in a critical server to keep the system |
9 |
online |
10 |
|until a tech can schedule maintenece. |
11 |
|
12 |
what do you mean by say that 'raid 1 arrays are really best ...' ? |
13 |
'best' ? why ? |
14 |
|
15 |
| Soo many things can happen to a raid 1 |
16 |
|that it is not a good solution for data backup. If a file is deleted, |
17 |
|corrupted, etc it is just mirrored to both drives. There is no |
18 |
rotation, or |
19 |
|history. |
20 |
|
21 |
i haven't ever considered this to be a data backup |
22 |
the really important things like mailbox or sources i'm working on, |
23 |
have regular tape backups, etc .. |
24 |
the reason why i have raid 1 on my workstation is, that if a drive |
25 |
crashes, i still want to be able |
26 |
to work, while waiting for the drive replacement to arrive |
27 |
additional 160gb drive cost me less then 80 eur and if it saves me 4 |
28 |
hours of time which i wouldn't |
29 |
be able to work without having raid 1, it was a good investment |
30 |
|
31 |
the fact that everything is 'just' mirrored to both drives is exactly |
32 |
the reason why i'm using it |
33 |
no matter how good your backup strategy is, if we are talking about a |
34 |
workstation you are using |
35 |
10 hours a day, you will always loose something |
36 |
i won't, unless both drives crash at the same time |
37 |
|
38 |
|Unfortunatly, its a lesson not commonly learned until it is too late |
39 |
:( Raid |
40 |
|is not a replacement for backups. It does help is a lot of |
41 |
instances, it is |
42 |
|not a bad idea, but it is flawed. |
43 |
|
44 |
|
45 |
as i've said, i don't think it is a replacement for backups |
46 |
i just take it as a quite good protection against loosing couple of |
47 |
hours just because of a disk failure; |
48 |
and if i am talking about couple of working hours, it is a replacement |
49 |
which pays for itself, given the current |
50 |
prices for ide drives |
51 |
|
52 |
|and create snapshots of the system configs and user files. On my |
53 |
main server |
54 |
|for my business, I dump the database and rsync every 30 minutes, and |
55 |
rotate |
56 |
|
57 |
|
58 |
on our e-commerce server, i replicate production database every 10 |
59 |
minutes to another server and have tape backup |
60 |
every night |
61 |
but this is completely different topic |
62 |
|
63 |
it is all about the cost of you backup strategy (now you can also |
64 |
include hardware backups, etc ...) vs. outage costs |
65 |
i was talking about a workstation, where you can invest up to 100 eurs |
66 |
to almost eliminate a risk of a drive failure |
67 |
|
68 |
|backup. The question of the day is how active is your data, and how |
69 |
far back |
70 |
|can you recover from. If losing a hour of work can kill you, then you |
71 |
|probably back up more often. Most people are fairly safe daily. On my |
72 |
|database, 30 minutes could be upseting, hence why it is so anally |
73 |
backed up. |
74 |
|
75 |
in my case, loosing of 30 minutes on the db server could upset |
76 |
customers who haven't downloaded results yet, but would |
77 |
definitely upset us because of inability of charging our customers for |
78 |
these 30 minutes |
79 |
that's why we do db sync every 10 minutes and think of getting raid 1 |
80 |
there as well; but in this case it is much pricey option |
81 |
because of scsi prices |
82 |
|
83 |
loosing of an hour of work can't usually kill you, but loosing 3-4 |
84 |
hours of work may be more expansive then additional 160gb drive |
85 |
for raid1 on a workstation |
86 |
|
87 |
|risk involved, then that is your choice. Just remember when you |
88 |
recommend |
89 |
|solutions to someone that may not be familure with the pro's and |
90 |
con's that |
91 |
|you let them know. Nothing is worst than a user that feels they are |
92 |
backed |
93 |
|up only to realize after the fact that important file is lost forever. |
94 |
|
95 |
|
96 |
if you recall the beginning of this thread, it was not a question |
97 |
about recommended backup strategy, it was a question |
98 |
about installing lvm over raid on scsi drives |
99 |
|
100 |
if i ask the question, i expect to get an answer to the question |
101 |
asked, not a recommendation why should i do things differently |
102 |
|
103 |
if i ask a wrong question, it is my fault and i should know better |
104 |
|
105 |
but of course, this is just my point of view |
106 |
|
107 |
best regards, |
108 |
martin |
109 |
|
110 |
-----BEGIN PGP SIGNATURE----- |
111 |
Version: GnuPG v1.2.4 (GNU/Linux) |
112 |
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org |
113 |
|
114 |
iD8DBQFAa3GTFCvm4cvhqkwRAoj0AJ4pCGP7+q1oRqUbgs5Y1338Ld180ACcDItA |
115 |
mmQvyo8aChgyvU7p4F+Fp3E= |
116 |
=19G/ |
117 |
-----END PGP SIGNATURE----- |