Re: Intel 82576 Gigabit on Debian 7 slow speed.
On 12/20/2015 08:36 AM, Mimiko wrote:
zpool create -f -m none -o ashift=12 zfspool raidz2
wwn-0x50000xxxxxxxxxxx ..... (all disks).
On 12/21/2015 11:20 PM, Mimiko wrote:
> One channel is connected to 8 x 2TB the other channel to 8 x 1TB.
...
> zfs list
> NAME USED AVAIL REFER MOUNTPOINT
> zfspool 11.5T 39.7G 335K none
RTFM zpool:
http://linux.die.net/man/8/zpool
Virtual Devices (vdevs)
...
raidz
...
A raidz group can have single-, double- , or triple parity,
meaning that the raidz group can sustain one, two, or three
failures, respectively, without losing any data. ... [The]
raidz2 vdev type specifies a double-parity raidz group;
...
A raidz group with N disks of size X with P parity disks can
hold approximately (N-P)*X bytes and can withstand P device(s)
failing before data integrity is compromised. The minimum
number of devices in a raidz group is one more than the number
of parity disks. The recommended number is between 3 and 9 to
help increase performance.
Doing the math for your 'zpool create' invocation:
N = 16 (total number of drives)
X = 1 TB (size of smallest drive)
P = 2 (raidz2)
size = (16 - 2) * 1 TB = 14 TB
But your 'zfs list' implies a pool size of 12 TB. I don't understand...
RTFM RAID card:
http://www.supermicro.com.tr/AOC-USASLP-L8i.pdf
Chapter 2 Connectors, Jumpers and Indicators
...
2-1 Front Connectors and Pin Definitions
...
Internal SAS Connectors
...
Use a single port SAS "ipass" cable (SuperMicro order number
CBL-0108L-02)
Are you using Supermicro cable CBL-0108L-02?
http://www.supermicro.com/support/resources/sas/
Are you using Supermicro chassis 836E2-R800V or 836E2-R800B?
http://www.supermicro.com/products/chassis/3U/836/SC836E2-R800.cfm
David
Reply to: