Date: Mon, 10 Dec 2007 17:27:33 -0500 From: Lan Tran <lan@hangwithme.com> To: Michael Fuckner <michael@fuckner.net> Cc: freebsd-hardware@freebsd.org Subject: Re: large disk > 8 TB Message-ID: <475DBD55.1000702@hangwithme.com> In-Reply-To: <475D7D60.4040701@fuckner.net> References: <475D7866.1070803@hangwithme.com> <475D7D60.4040701@fuckner.net>
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Michael Fuckner wrote:
> Lan Tran wrote:
>
>> I have a Dell PERC 6/E controller connected to an external Dell MD1000
>> storage, which I set up RAID 6 for. The RAID BIOS reports 8.5 TB. I
>> installed 7BETA4 amd64 and Sysinstall/dmesg.boot detects this correctly:
>> mfid1: <MFI Logical Disk> on mfi1
>> mfid1: 8578560MB (17568890880 sectors) RAID volume 'raid6' is optimal"
>>
>> However, after I created a zfs zpool on this device it only shows 185
>> GB. # zpool create tank /dev/mfid1s1d
>> # zpool list
>> NAME SIZE USED AVAIL CAP HEALTH ALTROOT
>> tank 185G 111K 185G 0% ONLINE -
>>
>> also with 'dh':
>> # df -h tank
>> Filesystem Size Used Avail Capacity Mounted on
>> tank 182G 0B 182G 0% /tank
>>
>>
>
> The main purpose of ZFS is doing Software raid (which is even faster
> than HW Raid nowadays).
>
> You should export all disks seperately to the OS- and then you don't
> have the 4GB limit wrapping the size to 185GB.
>
> Regards,
> Michael
>
Hi Michael,
I took your advice and went with ZFS software raid. There are 15-750 GB
SATA2 disks and I want the most space, easy management and reliability.
Performance (read/write) is not a big concern since it's a mail
archiving system. I chose raidz2 + 2 hot spares. Getting about 65
MB/s write performance from 'dd'.
# zpool status
pool: tank
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
raidz2 ONLINE 0 0 0
mfid1 ONLINE 0 0 0
mfid2 ONLINE 0 0 0
mfid3 ONLINE 0 0 0
mfid4 ONLINE 0 0 0
mfid5 ONLINE 0 0 0
mfid6 ONLINE 0 0 0
mfid7 ONLINE 0 0 0
mfid8 ONLINE 0 0 0
mfid9 ONLINE 0 0 0
mfid10 ONLINE 0 0 0
mfid11 ONLINE 0 0 0
mfid12 ONLINE 0 0 0
mfid13 ONLINE 0 0 0
spares
mfid14 AVAIL
mfid15 AVAIL
errors: No known data errors
Thanks!
Lan
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