Re: [zfs-discuss] What drives?

2011-02-26 Thread Brandon High
On Thu, Feb 24, 2011 at 10:45 PM, Markus Kovero markus.kov...@nebula.fi wrote:
 Hi! I'd go for WD RE edition. Blacks and Greens are for desktop use and 
 therefore lack proper TLER settings and have useless power saving features 
 that could induce errors and mysterious slowness.

There has been a lot of discussion about TLER in the past, and I'm
less convinced that it's a requirement for zfs than I used to think.
I've been using WD Green (EADS) drives for two years without issue.
They are ones that sleep and TLER settings could be changed on though.

Many of the new WD Green drives (including some of the RE) use 4k
sectors, which will wreak havoc on zpool performance. Other
manufacturers are starting to use 4k sectors on their 5400 rpm drives
as well so shop carefully if you decide to go with a lower spindle
speed. I have not seen a 7200 rpm drive with 4k sectors, but I'm sure
they exist.

-B

-- 
Brandon High : bh...@freaks.com
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Re: [zfs-discuss] What drives?

2011-02-25 Thread Tuomas Leikola
I'd pick samsung and use the savings for additional redundancy. Ymmv.
On Feb 25, 2011 8:46 AM, Markus Kovero markus.kov...@nebula.fi wrote:
 So, does anyone know which drives to choose for the next setup? Hitachis
look good so far, perhaps also seagates, but right now, I'm dubious about
the  blacks.

 Hi! I'd go for WD RE edition. Blacks and Greens are for desktop use and
therefore lack proper TLER settings and have useless power saving features
that could induce errors and mysterious slowness.

 Yours
 Markus Kovero
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Re: [zfs-discuss] What drives?

2011-02-24 Thread David Magda
On Feb 24, 2011, at 20:11, Roy Sigurd Karlsbakk wrote:

 So, does anyone know which drives to choose for the next setup? Hitachis look 
 good so far, perhaps also seagates, but right now, I'm dubious about the 
 blacks.

There are people who have lost data on Seagates, and so swear they'll never use 
them again; there are people who have lost data on Hitachis, and so swear 
they'll never use them again; there are peopleā€¦.

I have a bunch of Seagates that I'm using to clone the internal drive (Seagate) 
of my iMac for offsite backup purposes. No problems, but only minima use really.

Generally get the drive with the longest warranty period: this is usually an 
indication that the manufacturer is willing to put their money where their 
mouth is when it comes to longevity claims.

Of course WD FASS Black devices come with five year warranties, and that 
doesn't seem to be helping you much. :)
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Re: [zfs-discuss] What drives?

2011-02-24 Thread Markus Kovero
 So, does anyone know which drives to choose for the next setup? Hitachis look 
 good so far, perhaps also seagates, but right now, I'm dubious about the  
 blacks.

Hi! I'd go for WD RE edition. Blacks and Greens are for desktop use and 
therefore lack proper TLER settings and have useless power saving features that 
could induce errors and mysterious slowness.

Yours
Markus Kovero
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