12:48 p.m.
Date: Tue, 8 Apr 2008 11:50:50 +0100
From: Kevanf1 <kevanf1(a)gmail.com>
Subject: Re: [Staffslug] Filesystems
I also have to think about the compact flash drive. It's mentioned
often (and I did know but it had passed to the back of my memory) that
solid state drives only have a limited number of read write accesses.
So, I will need to keep those down (noatime me thinks).
I'm reasonably sure that it's only really writes, not reads, that wear out
solid state drives. At work we supply/support Linux-based firewalls that
run off a CF card, with a hard drive for logging etc. The CF card only
gets written to occasionally (changing iptables rules etc) but presumably
gets read a lot. We don't have a lot of failures of either hard drives or
CF cards.
Russ
1:09 p.m.
New subject: Filesystems
> I also have to think about the compact flash drive. It's
mentioned
> often (and I did know but it had passed to the back of my memory) that
> solid state drives only have a limited number of read write accesses.
> So, I will need to keep those down (noatime me thinks).
http://en.wikipedia.org/wiki/Flash_memory#Memory_wear
hm... i'd trust solid state drives for alot of things, still mainly
routers and in thin clients though tbh... and that's because the read
process doesn't affect it
(apologies if there's a stack of grammatical faults with that sentence!)
1:52 p.m.
New subject: Filesystems
On 08/04/2008, Andrew Edwards <edwards.andrew(a)gmail.com> wrote:
> > I also have to think about the compact flash drive.
It's mentioned
> > often (and I did know but it had passed to the back of my memory) that
> > solid state drives only have a limited number of read write accesses.
> > So, I will need to keep those down (noatime me thinks).
>
http://en.wikipedia.org/wiki/Flash_memory#Memory_wear
hm... i'd trust solid state drives for alot of things, still mainly
routers and in thin clients though tbh... and that's because the read
process doesn't affect it
(apologies if there's a stack of grammatical faults with that sentence!)
Russ, Andy yes, you are absolutely correct. I wrote it incorrectly as
read write processes. It is write processes that 'wear out' solid
state drives. Pure read processes don't do any harm, or so I believe.
What I want to do is have the server boot from a CF card in RO mode.
The second drive is to be a hard drive (as in standard platter type)
and that shouldn't have all that much sue in write states. However,
with a standard moving platter(s) hard drive even read states have a
wear effect because of the mechanical movement of the read write
heads. This should be lessened to a normal hard drive in a PC though
because it will contain large contiguous files that once in place are
not overwritten.
--
==============================================
Kevan Farmer
Linux user #373362
Staffordshire
2:15 p.m.
New subject: Filesystems
don't know if you know the ins and outs of how solid state drives work
(or whether you care...) ... basically a series of transistors which
are either on or off... multiple times over... making up data... when
you "zoom out" from that level
as with any electronic devices... they eventually get worn out!
imho... don't WORRY about it too much... you're unlikely to be writing
enough times to come close to the situation
3:54 p.m.
New subject: Filesystems
On 08/04/2008, Andrew Edwards <edwards.andrew(a)gmail.com> wrote:
don't know if you know the ins and outs of how solid state drives
work
(or whether you care...) ... basically a series of transistors which
are either on or off... multiple times over... making up data... when
you "zoom out" from that level
as with any electronic devices... they eventually get worn out!
imho... don't WORRY about it too much... you're unlikely to be writing
enough times to come close to the situation
Probably not :-)))) although, my SD cards take a hammering in my
DS50. It's why I only buy 1gb cards and not bigger for that. I'd
rather lose just 1gb of pictures (rather not actually) than 2 or
more...
--
==============================================
Kevan Farmer
Linux user #373362
Staffordshire
8:50 p.m.
New subject: Filesystems
Hi Kevan,
On Tue, Apr 08, 2008 at 01:52:11PM +0100, Kevanf1 wrote:
Russ, Andy yes, you are absolutely correct. I wrote it incorrectly
as
read write processes. It is write processes that 'wear out' solid
state drives. Pure read processes don't do any harm, or so I believe.
Decent quality solid state media should still last for decades even
if you write to it 24/7. I would have a journal on any writable file
system.
Cheers,
Andy
--
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Encrypted mail welcome - keyid 0x604DE5DB
10:53 a.m.
New subject: Filesystems
On 08/04/2008, Andy Smith <andy(a)lug.org.uk> wrote:
Hi Kevan,
On Tue, Apr 08, 2008 at 01:52:11PM +0100, Kevanf1 wrote:
> Russ, Andy yes, you are absolutely correct. I wrote it incorrectly as
> read write processes. It is write processes that 'wear out' solid
> state drives. Pure read processes don't do any harm, or so I believe.
Decent quality solid state media should still last for decades even
if you write to it 24/7. I would have a journal on any writable file
system.
Cheers,
Andy
Yes, it does seem that the quality has improved. From what I'm now
reading :-) I think my knowledge was a bit stale.... but then,
nothing stands still of course :-)
Cheers.
--
==============================================
Kevan Farmer
Linux user #373362
Staffordshire
6239
days inactive
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days old
6 comments
4 participants
participants (4)
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Andrew Edwards -
Andy Smith -
Kevanf1 -
Russ Phillips