James, earlier on he'd said he had them setup striped. I believe he
got them in RAID 6 instead. That's best for reliability. A striped
array that large is only as good as the weakest disk. Then he loses
up to 12 terabytes of data.
{^_^} Joanne
On 2011/06/06 05:28, James Holland wrote:
> This has to be Raid-ed though. I would suggest you are using some sort of
> hardware Raid as I've never heard of a disk that is 10TB. I thought the max
> we are up to these days is 3.
>
> On 06/06/11 12:25, Sunil M. Dogra wrote:
>>
>> Hi,
>>
>> Here is output pf fdisk -l. aslo I am not using any RAID.
>>
>> With Best Regards
>> sunil
>>
>> fdisk -l
>>
>>
>>
>> Disk /dev/cciss/c0d0: 146.7 GB, 146778685440 bytes
>> 255 heads, 63 sectors/track, 17844 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>> Device Boot Start End Blocks Id System
>> /dev/cciss/c0d0p1 * 14001 15000 8032500 83 Linux
>> /dev/cciss/c0d0p2 1 4000 32129968+ 82 Linux
>> swap / Solaris
>> /dev/cciss/c0d0p3 4001 10000 48195000 83 Linux
>> /dev/cciss/c0d0p4 10001 14000 32130000 5 Extended
>> /dev/cciss/c0d0p5 10001 14000 32129968+ 83 Linux
>>
>> Partition table entries are not in disk order
>>
>> Disk /dev/cciss/c0d1: 10001.7 GB, 10001711325184 bytes
>> 255 heads, 63 sectors/track, 1215972 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>> Device Boot Start End Blocks Id System
>> /dev/cciss/c0d1p1 1 267350 2147483647+ ee EFI GPT
>>
>>
>> On Mon, Jun 6, 2011 at 11:38 AM, jdow <[log in to unmask]
>> <mailto:[log in to unmask]>> wrote:
>>
>> Can you cut and paste the fdisk -l output into an email? It can tell
>> you a lot about what the drives really amount to.
>>
>> Are you running it as a RAID with checksum or simply striping? Your
>> numbers suggest something like RAID 6.
>>
>> This is the system I am currently prepping to use as a name server,
>> firewall, and email tool for a two person multi-computer (and a lot
>> of "gadgets") network here.
>>
>> Disk /dev/sda: 500.1 GB, 500107862016 bytes
>> 255 heads, 63 sectors/track, 60801 cylinders
>>
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>> Sector size (logical/physical): 512 bytes / 512 bytes
>> I/O size (minimum/optimal): 512 bytes / 512 bytes
>> Disk identifier: 0x00007e83
>>
>>
>> Device Boot Start End Blocks Id System
>> /dev/sda1 * 1 64 512000 83 Linux
>> Partition 1 does not end on cylinder boundary.
>> /dev/sda2 64 60802 487873536 8e Linux LVM
>>
>> The header portion is REALLY interesting. It's a 500 gigabyte
>> drive. But, it's only 488386584 1k blocks, 476940 1 meg blocks, or
>> 465 1 gigabyte blocks when speaking of 1024 byte entities rather
>> than 1000 byte entities.
>>
>> Your 12 1 terabyte disks striped array is only 10.91 TeraBytes
>> in computer speak - 1024 per K rather than 1000 per k. Could
>> that explain your discrepancy?
>>
>> {^_^} Joanne (First explained this to others in 1986. IMAO
>> disks should be advertised both ways for clarity.)
>>
>>
>> On 2011/06/05 22:11, Sunil M. Dogra wrote:
>>
>> Hi,
>>
>> Ans: / = ~45GB
>> /boot =~2GB
>> /swap =~16GB
>>
>>
>> I have another question
>>
>> why gparted, fdisk -l, system-config-lvm are giving different
>> outputs for
>> 12TB but giving the same output for 500GB
>>
>> With Regards
>> sunil
>>
>>
>> On Mon, Jun 6, 2011 at 3:28 AM, jdow <[log in to unmask]
>> <mailto:[log in to unmask]>
>> <mailto:[log in to unmask] <mailto:[log in to unmask]>>> wrote:
>>
>> On 2011/06/03 06:47, Alec T. Habig wrote:
>>
>> James Holland writes:
>>
>> Don't know why this is... But check how big your
>> other partitions
>> are using gparted.
>>
>>
>> Could it be that he's comparing the "1TB" drives he's
>> bought (which are
>> marketed as decimal 1x10^12 bytes) with the expected
>> (binary) 2^40
>> bytes?
>>
>> That's a 10% reduction in perceived space. If the disk
>> format has also
>> reserved the traditional (and now obsolete) 10% for root
>> use only, then
>> suddenly we're 2.5 TB down from what one would naively
>> expect after
>> clicking on "Newegg, please send me 12 terabyte drives".
>>
>> gparted will show the whole capacity (ignoring this root
>> reserve), but
>> "df" won't.
>>
>>
>> How big are /, /boot, and /swap?
>>
>>
>>
>>
>>
>>
>>
>> (I'm old fashioned and silly, I like "/dev/fdisk -l /dev/sda
>> >foo" as
>> a way of exporting the actual partitioning. I am not sure
>> fdisk would
>> be happy with 12 TB, though. But showing us the actual
>> partitioning
>> might be a good idea.)
>>
>> {o.o} Joanne. (Imprinted on the old tools back in about
>> '88 on of
>> all things "Amiga Unix.")
>>
>>
>>
>
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