On 02/19/2013 10:00 PM, Reindl Harald wrote:
Am 19.02.2013 22:42, schrieb Gordan Bobic:
On 19/02/2013 21:01, Reindl Harald wrote:
Am 19.02.2013 21:55, schrieb Gordan Bobic:
To give you an idea, I have a 24/7 server here, with a 4GB rootfs (ext4, no journal), including /var/log, and gets
yum updated reasonably regularly. It was created in May 2011, and has since then seen a grand total of 31GB of
writes, according to dumpe2fs. If it were on flash media, that would be about 8 full overwrites. 2992 remaining. Or
to put it another way, it has used up about 0.26% of it's life expectancy so far over 20 months. I would worry far
more about silent bit-rot on traditional RAID mechanical disks.
you really do not need to give me an idea :-)
Filesystem created: Wed Jun 8 13:10:56 2011
Lifetime writes: 44 TB
On how big a file system / disk?
3,6T = 12 overwrites
Even if it was a 4GB SSD, you'd still be at 25% of it's life expectancy after 18 months. That's 6 years of total
projected life expectancy. I have grown to expect less out of my mechanical disks
ah and you have long time expierience about SSD's
over 6 years? i doubt no and i doubt they are not
as relieable as you would wish
No, my experience does not go as far back 6 years for obvious reasons.
My exprience with mechanical disks, however, goes as far back as 25
years, and I can promise you, they are every bit as unreliable as you
fear the SSDs might be.
data without a raid are useless
My point was that even RAID is next to useless because it doesn't
protect you against bit-rot.
and in case of
RAID you have to have at least one full backup
and so it does not care me if disks are dying
Depends how many versioned backups you have, I suppose. It is possible
to not notice RAID silenced bit-rot for a long time, especially with a
lot of data.
Gordan
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