raid 5 momentus xt with extended cache?

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Ed Mun

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May 18, 2013
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first question..
would 2 hd momentus xt(hybryd) work on raid 0 or 5? seagate couldn't (or woldn't) answer, so i'n asking on this forum.
if someone have done it i've would be please to know.
second..
putting an extended cache would improve anything with these drives in raid?
..
mi idea is to use 2 1td hybrydi in raid 5 with a non hybrydi as backup, the hybryds will be on the sata3 port and the backup and the extended cache on the sata2.
..
sorry for any misspelling, i'n brazilian and some times my english sucks..
 
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Pinhedd

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Aug 7, 2007
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I have two Seagate Momentus XTs in RAID-0 in my laptop.

They do work and work quite nicely, but it is not officially supported. There have been compatibility issues in the past, but these have always been resolved through applying firmware updates to the drives.
 
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Ed Mun

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May 18, 2013
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10,510

thanks, that was really fast
could you put the address to the firmare..
did you install the firmware after the raid? did your raid was by hardware, by software or by 'OS'? if i an too intrusive i'n sorry, but i have tramble with happyness after seen your coment.
did you experiment on extended cache? the hybryd hd uses sonthing similar so i'n wandering if woldn't do the same as them or even compete for the chunks of bytes.
thanks anyway, you have made my day.

 
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Pinhedd

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Aug 7, 2007
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You can install the firmware after the devices have been put into a RAID if and only if the drives are attached to a port controller that does not abstract the drives themselves. The best way to do this is with the Intel Rapid Storage Technology controller (the one on all Intel chipset motherboards).

Side Note: RAIDs formed by the Intel/AMD chipsets are not true hardware RAIDs, they are firmware assisted software RAIDs. This isn't relevant at the moment, but it's an important distinction.

The firmware updates can be found here

http://knowledge.seagate.com/articles/en_US/FAQ/215451en

If your model isn't listed there, then there's no publicly available updates for it.

Using an SSD as an extended hard drive cache is not something that I would recommend in this case. The Seagate Momentus XT hard disks have massive Flash memory caches on them which are managed by the hard drives themselves. The cache works at the block level and is not exposed externally. Adding a larger, extended cache would simply result in the same data being cached on both the hybrid hard disks themselves, and on the extended cache.
 
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