Hard Disk IDs in Linux

S. Dale Morrey sdalemorrey at gmail.com
Sat Mar 16 03:17:21 MDT 2013


Just curious but have you considered something like this...
http://blog.backblaze.com/category/storage-pod/

On Sat, Mar 16, 2013 at 4:04 AM, Dan Egli <ddavidegli at gmail.com> wrote:
>> For a home server I recommend RAID1 or RAID10 over RAID6.
>
> Really? I guess between RAID6 and RAID10 it's not much different, but what
> about someone who has say six or eight disks in the server? I'm curious why
> you'd still recommend RAID10? Hypothetically speaking, let's assume I
> wanted to have a server big enough to hold 1 year of downloaded data from
> the net, downloading at approx 5Mbps (with TCP overhead, that comes to
> approx 1 MB every 2 seconds) 24/7/365. That's nearly 16 TB. A RAID6 could
> handle that with 6 drives, 4TB each. A raid10 would need 8 drives. I admit
> each is possible to throw into a full tower case, but why spend the extra
> money on two more drives, making the two raid10s? I am genuinely curious.
>
>
>
>
>
>> What kind of chassis? Most good chassis will do hardware RAID and
>
>> export the volumes. Though there are some bare disk arrays that simply
>
>> export devices as SCSI LUNs. Either way you need a chassis with a power
>
>> supply.
>
>
>
> Well, that's not really an issue because I finally realized I could break
> my boss down by using some basic math. I showed him using basic
> multiplication how long it would take to fill the 120TB array he wanted
> (more than eight years to reach 25% capacity) and he FINALLY agreed that we
> could do it much cheaper and easier by building a full tower PC and filling
> it with Hard Disk Drives. So we're going to order the parts soon. Thank
> goodness for that. I'm still not sure which chassis he wanted. I think he
> was thinking of going to a company like Aberdeen or someone. I have
> insufficent experience to state whether or not that was a good idea, but
> thankfully it's a moot point now. I imagine we can fit about 10 disks in a
> large case (I have to do some research on cases to find the one that will
> let us hold as many hard disks as we can), and make a raid out of them.
>
>
>
>
>
>> I'm not sure how I feel about ZFS... ZFS is not a supported Linux file
>
>> system. It's third-party and licensing conflicts means you have to
>
>> compile the modules yourself everytime a kernel is updated. Though
>
>> this is largely automated these days with the dkms system that many
>
>> distros use. And maybe there are binary repositories.
>
>
>
>> I feel that ZFS in and of itself is stable and production-ready (I used
>
>> it for years on Solaris without issue). But I'm not sure of the status
>
>> of the zfs-on-linux project.
>
>
>
> So what would you use? Be aware that he's REALLY keen on using a file
> system that includes journaling and data-deduplication. I don't know how
> easy it's going to be to change his mind. It took near a week of arguments
> before I got him to abandon the rackmount server idea. I'm well aware of
> many of the advantages of file systems like Ext4 and JFS. But try
> convincing my boss on that. He's one of those people who hears about some
> new idea, likes it, and wants it implemented, despite not knowing how it
> works internally or what would be involved in the implementation.
>
>
>
>> I get the impression your boss thinks the large disk array idea is on the
> same
>
>> order of complexity as throwing disks in a box and setting up a software
> RAID.
>
>
>
> EXACTLY. That's PRECISELY what he thought. He's all "Linux supports
> software Raid! You've shown yourself that it can handle the number of
> drives in the server that we'll have. So why not just throw the drives in,
> connect them to the various controller cables, and build the raid?" and
> didn't want to listen to ideas that it would likely be MUCH more
> complicated than that. But now that he's finally agreed to a full tower I
> just have to be sure we order either a motherboard with enough controller
> ports on it, or order a separate controller card to handle whatever the
> motherboard can't.
>
>
>
> What kind of an interface would you guys recommend? Now that he's resigned
> to a PC tower case he's thinking standard SATA. While I'm sure that would
> work, is there a better idea?
>
>
> Thanks!
>
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