head units crash or do weird things, but disks persist. There are a couple of
HA head-unit solutions out there but most of them have their own separate
storage and they effectively just send transaction groups to each other.
The other way is to connect 2 nodes to an external SAS/FC chassis.
I have this with 36 2TB drives (and 2 separate boot drives).
http://www.colfax-intl.com/jlrid/SpotLight_more_Acc.asp?L=134S=58B=2267
That's just a Supermicro SC847.
http://www.supermicro.com/products/chassis/4U/?chs=847
Stay away from the 24 port expander backplanes. I've gone thru several
Geoff Nordli geo...@grokworx.com wrote:
With our particular use case we are going to do a save
state on their
virtual machines, which is going to write 100-400 MB
per VM via CIFS or
NFS, then we take a snapshot of the volume, which
guarantees we get a
consistent copy of their VM.
maybe
Please can this be on by default? Please?
There are some situations where many reports may be sent
per second so
it is not necessarily a wise idea for this to be enabled by
default.
Every implementation of Syslog worth a damn has automatic message throttling
and coalescing. This is not
Thanks for the testing. so FINALLY with version 19 does ZFS demonstrate
production-ready status in my book. How long is it going to take Solaris to
catch up?
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For those who are interested in some of the options out there.
DIY DAS:
Supermicro 36 bay case - $1800
Promise 16 bay JBOD VTrak J610sD - $3700
Promise VTE610sD - $7500 (SAS attached head unit with onboard raid controllers,
takes JBOD expansion)
The following apply to 1TB SATA drive
It might help people to understand how ridiculous they
sound going on and on
about buying a premium storage appliance without any
storage.
Since I started this, let me explain to those who can't begin to understand why
I proposed something so stupid. At work (branch of a federal gov't big-5
what with the home NAS conversations, what's the trick to buy a J4500 without
any drives? SUN like every other enterprise storage vendor thinks it's ok to
rape their customers and I for one, am not interested in paying 10x for a silly
SATA hard drive.
charge a premium for their products but they ARE a
enterprise vendor. You
wouldn't say something like hey, where can i buy a Ferrari
without any
wheels...i'm not paying x amount for a silly aluminum
wheel
true. but I buy a Ferrari for the engine and bodywork and chassis engineering.
It
charge a premium for their products but they ARE a
enterprise vendor. You
wouldn't say something like hey, where can i buy a Ferrari
without any
wheels...i'm not paying x amount for a silly aluminum
wheel
true. but I buy a Ferrari for the engine and bodywork and chassis engineering.
It
please forgive the 'stupid' question.
Aside from having a convenient hash table of checksums to consult and upon
detection of a collision knowing we are dealing with a duplicate, why checksum
data when the memory bus, PCI-e/x bus, sata/sas bus, and the hard disk itself
use Reed-Solomon (or
With the absolutely deplorable reliability of drives 1TB why would one even
waste their money? The 500GB RE2/3 and NS drives are very reliable and
$.12/gb. I get new drives off ebay all the time.
NAS speed is all about spindles. 6 spindles will always outrun a setup with 3.
Almost any mid-size
the proper solution to out of control cabling is ML cables. However, aside from
the Supermicro 8-in-2 type of pseudo-enclosures nobody seems to make them for
the typical consumer use. You can get 12 or 16 drive backplanes that use ML
cables but they are necessarily wed to a particular chassis.
Chris Siebenmann c...@cs.toronto.edu wrote:
People have already mentioned the RAID-[56] write hole,
but it's more
than that; in a never-overwrite system with multiple blocks
in one RAID
stripe, how do you handle updates to some of the blocks?
See:
I find it baffling that RaidZ(2,3) was designed to split a record-size block
into N (N=# of member devices) pieces and send the uselessly tiny requests to
spinning rust when we know the massive delays entailed in head seeks and
rotational delay. The ZFS-mirror and load-balanced configuration do
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