looking for good reference on storage configuration

looking for good reference on storage configuration

[Miles Fidelman]

Hi Folks,

Perhaps someone here might be able to point me at a reference or two on 
alternatives and best practices for configuring storage for a server - 
using a mix of SSDs and conventional drives.

I'm in the process of upgrading a small cluster of 4 machines - each 
containing RAID arrays, with DRBD across clusters to support failover.  
Easy enough with a uniform collection of HDDs.  But I can't get my head 
around how to add SSDs into the mix - what with the mismatch in access 
speeds and all, it would seem like one needs a more complex 
configuration with a level of caching between the faster and slower media.

Seems like someone would have written a book, or tutorial, or case 
study, or conference presentation - but damned if I can find anything.  
Any pointers, or guidance, would be much appreciated.

Thanks,

Miles Fidelman

-- 
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra

Re: looking for good reference on storage configuration

[Ladislav Mate]

On Wed, Oct 21, 2015 at 2:00 PM, Miles Fidelman
<mfidelman@meetinghouse.net> wrote:
> Hi Folks,
>
> Perhaps someone here might be able to point me at a reference or two on
> alternatives and best practices for configuring storage for a server - using
> a mix of SSDs and conventional drives.
>
> I'm in the process of upgrading a small cluster of 4 machines - each
> containing RAID arrays, with DRBD across clusters to support failover.  Easy
> enough with a uniform collection of HDDs.  But I can't get my head around
> how to add SSDs into the mix - what with the mismatch in access speeds and
> all, it would seem like one needs a more complex configuration with a level
> of caching between the faster and slower media.
>
> Seems like someone would have written a book, or tutorial, or case study, or
> conference presentation - but damned if I can find anything.  Any pointers,
> or guidance, would be much appreciated.
>
> Thanks,
>
> Miles Fidelman
>
> --
> In theory, there is no difference between theory and practice.
> In practice, there is.   .... Yogi Berra
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
Hi Miles,
might me long shot, but can take a look on LVM caching..
Good description how to setup it is here :
http://blog-vpodzime.rhcloud.com/?p=45
Working for me for months now.... without DRBD.
HTH,

--
Ladislav Máte
--
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Re: looking for good reference on storage configuration

[Miles Fidelman]

Thanks Ladislav - that gives me a starting point!

Best,

Miles

On 11/5/15 12:44 PM, Ladislav Mate wrote:
> On Wed, Oct 21, 2015 at 2:00 PM, Miles Fidelman
> <mfidelman@meetinghouse.net> wrote:
>> Hi Folks,
>>
>> Perhaps someone here might be able to point me at a reference or two on
>> alternatives and best practices for configuring storage for a server - using
>> a mix of SSDs and conventional drives.
>>
>> I'm in the process of upgrading a small cluster of 4 machines - each
>> containing RAID arrays, with DRBD across clusters to support failover.  Easy
>> enough with a uniform collection of HDDs.  But I can't get my head around
>> how to add SSDs into the mix - what with the mismatch in access speeds and
>> all, it would seem like one needs a more complex configuration with a level
>> of caching between the faster and slower media.
>>
>> Seems like someone would have written a book, or tutorial, or case study, or
>> conference presentation - but damned if I can find anything.  Any pointers,
>> or guidance, would be much appreciated.
>>
>> Thanks,
>>
>> Miles Fidelman
>>
>> --
>> In theory, there is no difference between theory and practice.
>> In practice, there is.   .... Yogi Berra
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Hi Miles,
> might me long shot, but can take a look on LVM caching..
> Good description how to setup it is here :
> http://blog-vpodzime.rhcloud.com/?p=45
> Working for me for months now.... without DRBD.
> HTH,
>
> --
> Ladislav Máte
> --
> --
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 
In theory, there is no difference between theory and practice.
In practice, there is.  .... Yogi Berra

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