From: "Chris Adams" mailto:li...@cmadams.net>>
Date: Friday, 3 March 2023 at 00:09:48
To: "users@lists.fedoraproject.org"
mailto:users@lists.fedoraproject.org>>
Subject: Re: software or hardware raid?
Once upon a time, George N. White III said:
> Some data
On Thu, 2023-03-02 at 19:36 -0500, Jeffrey Walton wrote:
> Also see "A Journal for MD/RAID5", https://lwn.net/Articles/665299/
> and "ext3 and RAID: silent data killers?",
> https://lwn.net/Articles/349970/0/ . But both articles are kind of old.
Yes, is a 2009 article still valid? Likewise with t
Tim:
>> I have a UPS sitting next to me, right now, in pieces, which (half)
>> died in a most peculiar manner:
>>
>
>> While running off the mains its output is a (too) low voltage, but
>> still high enough for most switch-mode power supplies to run
>> normally (i.e. the computer and monitor). It
On Fri, Mar 3, 2023 at 7:07 AM Jeffrey Walton wrote:
>
>
> I don't think the part about a generator is a good idea. Generators
> are usually wildly out of spec for Total Harmonic Distortion (THD). A
> generator under load can easily reach 15% to 20% THD. Meanwhile,
> electronics usually expect 3%
On Fri, Mar 3, 2023 at 7:54 AM Roger Heflin wrote:
>[...]
>
> If you read about normal UPSes they are not normally designed to run
> 100% duty cycle (ie on battery for days, or fixing up a low voltage
> for days). So if you run yours at say 40% load it will probably
> survive under the higher dut
On Thu, Mar 2, 2023 at 9:42 PM Tim via users
wrote:
>
> I have a UPS sitting next to me, right now, in pieces, which (half)
> died in a most peculiar manner:
>
> A burning smell was eventually traced to it. There's no visible signs
> of burning, and no schematic available for the model, that I ca
Tim:
>> I have a UPS sitting next to me, right now, in pieces, which (half)
>> died in a most peculiar manner:
>>
>> A burning smell was eventually traced to it. There's no visible
>> signs of burning, and no schematic available for the model, that I
>> can find. A rather acrid smell, not one I'm
On Thu, Mar 2, 2023 at 10:42 PM Tim via users
wrote:
>
> On Thu, 2023-03-02 at 17:09 -0600, Chris Adams wrote:
> > Lots of the time, UPSes and generators are not actively monitored and
> > tested. An untested backup system is not a backup system, it's just
> > another point of failure! I have se
On Thu, 2023-03-02 at 17:09 -0600, Chris Adams wrote:
> Lots of the time, UPSes and generators are not actively monitored and
> tested. An untested backup system is not a backup system, it's just
> another point of failure! I have seen failures of big UPSes,
> generators, transfer switches... you
On Wed, Mar 1, 2023 at 3:02 PM Ranjan Maitra wrote:
>
> I would like to RAID two of my disks, and I was wondering if the
> recommendation is to do software or hardware RAID?
Also see "A Journal for MD/RAID5", https://lwn.net/Articles/665299/
and "ext3 and RAID: sile
Once upon a time, George N. White III said:
> Some data can be replaced, but there are also real-time data flows
> where data are lost forever when the system does down. I recall a
> lost-of-data incident where the system was on UPS+ generator but
> IT hadn't received the replacement for a failed
On Thu, Mar 2, 2023 at 4:49 PM Roger Heflin wrote:
> if you suddenly lose power there is a fair chance that the last few
> blocks of data had not made it to disk yet.
>
Some data can be replaced, but there are also real-time data flows
where data are lost forever when the system does down. I re
On Thu, Mar 2, 2023 at 4:43 PM Richard Shaw wrote:
> On Thu, Mar 2, 2023 at 2:25 PM Ranjan Maitra wrote:
>
>> Thanks to everybody. I recall discussion from several years ago on the
>> benefits of software over hardware RAID. I had completely forgotten about
>> UPS for this new machine. Btw, what
Once upon a time, Ranjan Maitra said:
> Thanks, this will be a fairly high uptime machine (not allowed to call it a
> server here, because that is central IT's role to have and administer:-),
> running lots of jobs at least a large part of the time, but the RAID will be
> on the /. It is more
Thanks, Chris!
On Thu Mar02'23 02:49:49PM, Chris Adams wrote:
> From: Chris Adams
> Date: Thu, 2 Mar 2023 14:49:49 -0600
> To: users@lists.fedoraproject.org
> Reply-To: Community support for Fedora users
> Subject: Re: software or hardware raid?
>
> Once upon a
Once upon a time, Ranjan Maitra said:
> Thanks to everybody. I recall discussion from several years ago on the
> benefits of software over hardware RAID. I had completely forgotten about UPS
> for this new machine. Btw, what happens if power goes out (and I do not have
> UPS)?
Linux software R
> To: Community support for Fedora users
> > Reply-To: Community support for Fedora users
> > Subject: Re: software or hardware raid?
> >
> > On Wed, Mar 1, 2023 at 4:02 PM Ranjan Maitra wrote:
> >
> > > Hi,
> > >
> > > I would like to R
On Thu, Mar 2, 2023 at 2:25 PM Ranjan Maitra wrote:
> Thanks to everybody. I recall discussion from several years ago on the
> benefits of software over hardware RAID. I had completely forgotten about
> UPS for this new machine. Btw, what happens if power goes out (and I do not
> have UPS)?
>
If
:25PM, George N. White III wrote:
> From: "George N. White III"
> Date: Thu, 2 Mar 2023 14:19:25 -0400
> To: Community support for Fedora users
> Reply-To: Community support for Fedora users
> Subject: Re: software or hardware raid?
>
> On Wed, Mar 1, 2023 at 4:0
On Wed, Mar 1, 2023 at 4:02 PM Ranjan Maitra wrote:
> Hi,
>
> I would like to RAID two of my disks, and I was wondering if the
> recommendation is to do software or hardware RAID?
>
Software RAID works very well on modern hardware. You do want to make sure
a power
outage can
On 2023-03-01 12:01 pm, Ranjan Maitra wrote:
Hi,
I would like to RAID two of my disks, and I was wondering if the
recommendation is to do software or hardware RAID?
Thanks,
Ranjan
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-Original Message-
From: Ranjan Maitra
Sent: Wednesday, March 1, 2023 9:02 PM
To: Community Support for Fedora Users
Subject: software or hardware raid?
Hi,
I would like to RAID two of my disks, and I was wondering if the recommendation
is to do software or hardware RAID?
Thanks
On 3/1/23 21:01, Ranjan Maitra wrote:
Hi,
I would like to RAID two of my disks, and I was wondering if the recommendation
is to do software or hardware RAID?
Software.
Everything you need is in the mdadm command.
Regards.
--
Roberto Ragusamail at robertoragusa.it
On 2023-03-01 4:37 p.m., Peter Boy wrote:
Am 01.03.2023 um 21:45 schrieb John Mellor :
BTRFS is massively faster and safer than all other implementations other than
perhaps ZFS, is at least partially error compensating, does not demand
identical drives, and can be easily converted into othe
On Wed, Mar 1, 2023 at 2:02 PM Ranjan Maitra wrote:
>
> Hi,
>
> I would like to RAID two of my disks, and I was wondering if the
> recommendation is to do software or hardware RAID?
>
> Thanks,
> Ranjan
I work with a lot of hardware raid from a couple of vendors.
The
> Am 01.03.2023 um 21:45 schrieb John Mellor :
>
> BTRFS is massively faster and safer than all other implementations other than
> perhaps ZFS, is at least partially error compensating, does not demand
> identical drives, and can be easily converted into other RAID classes
> dynamically as de
On 3/1/23 15:01, Ranjan Maitra wrote:
> I would like to RAID two of my disks, and I was wondering if the
> recommendation is to do software or hardware RAID?
Honestly, in my experience, I've found software RAIDs to be much more reliable
than hardware. But as always, your milea
On Wed, Mar 1, 2023 at 2:45 PM John Mellor wrote:
>
> On 2023-03-01 3:01 p.m., Ranjan Maitra wrote:
> > I would like to RAID two of my disks, and I was wondering if the
> recommendation is to do software or hardware RAID?
> Don't even consider hardware RAID solutions that
On 2023-03-01 3:01 p.m., Ranjan Maitra wrote:
I would like to RAID two of my disks, and I was wondering if the recommendation
is to do software or hardware RAID?
Don't even consider hardware RAID solutions that became out-of-favour 25
years ago. You can easily do it with LVM/MDR combina
On Wed, 1 Mar 2023 14:01:37 -0600
Ranjan Maitra wrote:
> I would like to RAID two of my disks, and I was wondering if the
> recommendation is to do software or hardware RAID?
I'm pretty sure software is better. You don't get weird hardware
implementations which make your disks
Hi,
I would like to RAID two of my disks, and I was wondering if the recommendation
is to do software or hardware RAID?
Thanks,
Ranjan
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