[OmniOS-discuss] Zil Device

[Richard Elling]

> On Jul 16, 2015, at 11:30 AM, Schweiss, Chip <chip at innovates.com> wrote:
> 
> The 850 Pro should never be used as a log device.  It does not have power fail protection of its ram cache.   You might as well set sync=disabled and skip using a log device entirely because the 850 Pro is not protecting your last transactions in case of power failure.

Chip, are you asserting that the 850 Pro does not honor the cache flush command?
In the bad old days, there were SSDs that were broken for cache flushes, but some of
the most important (to Samsung) OSes, like Windows, rely on cache flushes to work.
ZFS does as well.
 -- richard

> 
> Only SSDs with power failure protection should be considered for log devices.   
> 
> That being said, unless your running application that need transaction consistency such as databases, don't bother with using a log device and set sync=disabled.   
> 
> -Chip
> 
> On Thu, Jul 16, 2015 at 11:55 AM, Doug Hughes <doug at will.to <mailto:doug at will.to>> wrote:
> 8GB zil on very active server and 100+GB ssd lasts many years. We have yet, after years of use of various SSDs, to have one fail from wear usage, and that's with fairly active NFS use.
> They usually fail for other reasons.
> We started with with Intel X series, which are only 32GB in size, and some of them are still active, though less active use now. With Samsung 850 pro, you practically don't have to worry about it, and the price is really good.
> 
> 
> On Thu, Jul 16, 2015 at 12:36 PM, Brogyányi József <brogyi at gmail.com <mailto:brogyi at gmail.com>> wrote:
> Hi Doug
> 
> Can you write its life time? I don't trust any SSD but I've thinking for a while to use as a ZIL+L2ARC.
> Could you share with us your experiences? I would be interested in server usage. Thanks.
> 
> 
> 
> 2015.07.15. 22:42 keltezéssel, Doug Hughes írta:
>> We have been preferring commodity SSD like Intel 320 (older), intel 710, or currently, Samsung 850 pro. We also use it as boot drive and reserve an 8GB slide for ZIL so that massive synchronous NFS IOPS are manageable.
>> 
>> Sent from my android device.
>> 
>> -----Original Message-----
>> From: Matthew Lagoe <matthew.lagoe at subrigo.net> <mailto:matthew.lagoe at subrigo.net>
>> To: omnios-discuss at lists.omniti.com <mailto:omnios-discuss at lists.omniti.com>
>> Sent: Wed, 15 Jul 2015 16:29
>> Subject: [OmniOS-discuss] Zil Device
>> 
>> Is the zeusram SSD still the big zil device out there or are there other 
>> high performance reliable options that anyone knows of on the market now? I 
>> can't go with like the DDRdrive as its pcie. 
>> 
>> Thanks 
>> 
>> 
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