Re: [zfs-discuss] SSD best practices

[Dave Vrona]

 
 On 18 apr 2010, at 00.52, Dave Vrona wrote:
 
  Ok, so originally I presented the X-25E as a
 reasonable approach.  After reading the follow-ups,
 I'm second guessing my statement.
  
  Any decent alternatives at a reasonable price?
 
 How much is reasonable? :-)

How about $1000 per device?  $2000 for a mirrored pair.
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Re: [zfs-discuss] SSD best practices

[Dave Vrona]

The Acard device mentioned in this thread looks interesting:

http://opensolaris.org/jive/thread.jspa?messageID=401719#401719
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Re: [zfs-discuss] SSD best practices

[Dave Vrona]

Or, DDRDrive X1 ?  Would the X1 need to be mirrored?
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Re: [zfs-discuss] SSD best practices

[Dave Vrona]

 IMHO, whether a dedicated log device needs redundancy
 (mirrored), should
 be determined by the dynamics of each end-user
 environment (zpool version,
 goals/priorities, and budget).
 

Well, I populate a chassis with dual HBAs because my _perception_ is they tend 
to fail more than other cards.  

Please help me with my perception of the X1.  :-)
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[zfs-discuss] SSD best practices

[Dave Vrona]

Hi all,

I'm planning a new build based on a SuperMicro chassis with 16 bays.  I am 
looking to use up to 4 of the bays for SSD devices.

After reading many posts about SSDs I believe I have a _basic_ understanding of 
a reasonable approach to utilizing SSDs for ZIL and L2ARC.

Namely:

ZIL:  Intel X-25E
L2ARC:  Intel X-25M

So, I am somewhat unclear about a couple of details surrounding the deployment 
of these devices.

1) Mirroring.  Leaving cost out of it, should ZIL and/or L2ARC SSDs be mirrored 
?

2) ZIL write cache.  It appears some have disabled the write cache on the 
X-25E.  This results in a 5 fold performance hit but it eliminates a potential 
mechanism for data loss.  Is this valid?  If I can mirror ZIL, I imagine this 
is no longer a concern?

3) SATA devices on a SAS backplane.  Assuming the main drives are SAS, what 
impact do the SATA SSDs have?  Any performance impact?  I realize I could use 
an onboard SATA controller for the SSDs however this complicates things in 
terms of the mounting of these drives.

thanks !
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Re: [zfs-discuss] SSD best practices

[Dave Vrona]

Ok, so originally I presented the X-25E as a reasonable approach.  After 
reading the follow-ups, I'm second guessing my statement.

Any decent alternatives at a reasonable price?
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