[Info-vax] Reclaim disk space for a 3PAR Storage Box

[Arne Vajhøj]

On 8/30/2021 10:03 PM, Dave Froble wrote:
> On 8/30/2021 1:44 PM, Simon Clubley wrote:
>> On 2021-08-30, Stephen Hoffman <seaohveh at hoffmanlabs.invalid> wrote:
>>> A whole lot has changed with storage and storage I/O since HDDs reigned
>>> supreme. 12 TB drives, and 4 TB SSDs are now commonplace, among other
>>> differences.
>>
>> SSDs make me nervous because when they fail, they tend to fail hard
>> and sudden without any warning.
> 
> Never seen a total head crash on a HDD?  Ok, neither have I, but I have 
> seen HDDs fail, and once they start, you cannot count on getting 
> accurate data off them.
> 
> Oh, and welcome to the new world of cheap and semi-reliable PC junk 
> hardware ....
> 
>> Hardware RAID or software volume shadowing would normally take care
>> of that but there have been enough cases in recent years where a
>> complete set of SSD devices all fail at the same time due to firmware
>> bugs to make me nervous about using them.
> 
> See above about cheap and semi-reliable PC junk hardware ....

There are usually some correlation between price and quality.

I have no doubt that:

MTBF(enterprise,2021) > MTBF(consumer,2021)
MTBF(enterprise,1986) > MTBF(consumer,1986)

but at least for disk then:

MTBF(consumer,2021) > MTBF(enterprise,1986)

Modern disks are actually pretty reliable.

VAX disks were not always reliable. I remember a 8650
with RA81's and RA82's - DEC field service replaced disks
several times per year (especially the RA81's).

Arne