Have you also created your partitions with a reasonably new fdisk (or
equivalent) with -c -u as options?
Your partitions should be starting somewhere at 2048 i guess (let the
sw figure that out). The fast degradation of the one disk might
indicate bad partitioning? (maybe recheck with a grml.iso
* Yeb Havinga:
The biggest drawback of 2 SSD's with supercap in hardware raid 1, is
that if they are both new and of the same model/firmware, they'd
probably reach the end of their write cycles at the same time, thereby
failing simultaneously.
I thought so too, but I've got two Intel 320s (I
On 07/18/2011 11:56 PM, Andy wrote:
I'm talking about after I get 2 Intel 320s, should I spend the extra
money on a RAID BBU? Adding RAID BBU in this case wouldn't improve
reliability, but does it improve performance? If so, how much
improvement can it bring?
It won't improve performance
On 2011-07-19 09:56, Florian Weimer wrote:
* Yeb Havinga:
The biggest drawback of 2 SSD's with supercap in hardware raid 1, is
that if they are both new and of the same model/firmware, they'd
probably reach the end of their write cycles at the same time, thereby
failing simultaneously.
I
* Yeb Havinga:
On 2011-07-19 09:56, Florian Weimer wrote:
* Yeb Havinga:
The biggest drawback of 2 SSD's with supercap in hardware raid 1, is
that if they are both new and of the same model/firmware, they'd
probably reach the end of their write cycles at the same time, thereby
failing
On 2011-07-19 12:47, Florian Weimer wrote:
It would be interesting to see if the drives also show total xyz
written, and if that differs a lot too.
Do you know how to check that with smartctl?
smartctl -a /dev/your disk should show all values. If it shows
something that looks like garbage,
* Yeb Havinga:
On 2011-07-19 12:47, Florian Weimer wrote:
It would be interesting to see if the drives also show total xyz
written, and if that differs a lot too.
Do you know how to check that with smartctl?
smartctl -a /dev/your disk should show all values. If it shows
something that
On 2011-07-19 13:37, Florian Weimer wrote:
Is this Total_LBAs_Written?
I got the same name Total_LBAs_Written on an 5.39 smartmontools, which
was renamed to 241 Lifetime_Writes_GiB after upgrade to 5.42. Note that
this is smartmontools new interpretation of the values, which happen to
match
Yeb Havinga wrote:
So for the Intels it's probably also lifetime writes in GB but you'd
have to check with an Intel smart values reader to be absolutely sure.
With my 320 series drive, the LBA units are pretty clearly 32MB each.
Watch this:
root@toy:/ssd/data# smartctl --version
smartctl
On 2011-07-18 03:43, Andy wrote:
Hi,
Is BBU still needed with SSD?
SSD has its own cache. And in certain models such as Intel 320 that cache is
backed by capacitors. So in a sense that cache acts as a BBU that's backed by
capacitors instead of batteries.
In this case is BBU still needed? If
On Sun, Jul 17, 2011 at 7:30 PM, Craig Ringer
cr...@postnewspapers.com.au wrote:
On 18/07/2011 9:43 AM, Andy wrote:
Is BBU still needed with SSD?
You *need* an SSD with a supercapacitor or on-board battery backup for its
cache. Otherwise you *will* lose data.
Consumer SSDs are like a hard
Andy wrote:
SSD has its own cache. And in certain models such as Intel 320 that cache is backed by capacitors. So in a sense that cache acts as a BBU that's backed by capacitors instead of batteries.
Tests I did on the 320 series says it works fine:
--- On Mon, 7/18/11, David Rees dree...@gmail.com wrote:
In this case is BBU still needed? If I put 2 SSD
in software RAID 1, would
that be any slower than 2 SSD in HW RAID 1 with
BBU? What are the pros and
cons?
What will perform better will vary greatly depending on the
exact
Andy wrote:
--- On Mon, 7/18/11, David Rees dree...@gmail.com wrote:
In this case is BBU still needed? If I put 2 SSD
in software RAID 1, would
that be any slower than 2 SSD in HW RAID 1 with
BBU? What are the pros and
cons?
What will perform better will vary greatly
I'm not comparing SSD in SW RAID with rotating disks
in HW RAID with
BBU though. I'm just comparing SSDs with or without
BBU. I'm going to
get a couple of Intel 320s, just want to know if BBU
makes sense for
them.
Yes, it certainly does, even if you have a RAID BBU.
even if you
Hi,
Is BBU still needed with SSD?
SSD has its own cache. And in certain models such as Intel 320 that cache is
backed by capacitors. So in a sense that cache acts as a BBU that's backed by
capacitors instead of batteries.
In this case is BBU still needed? If I put 2 SSD in software RAID 1,
On 18/07/2011 9:43 AM, Andy wrote:
Hi,
Is BBU still needed with SSD?
You *need* an SSD with a supercapacitor or on-board battery backup for
its cache. Otherwise you *will* lose data.
Consumer SSDs are like a hard disk attached to a RAID controller with
write-back caching enabled and no BBU.
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