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> Date: Thu, 11 Jun 2009 11:51:50 +0100 > From: gordon+dcglug@xxxxxxxxxx > To: list@xxxxxxxxxxxxx > Subject: Re: [LUG] Mounting Partitions > > On Thu, 11 Jun 2009, Austin Gossmeyer wrote: > > > I have 3x17431M and 2x34857M drives on a Ubuntu 9.04 system. I am > > wondering the best way to split them up. At the moment Ubuntu is > > installed on one of the 17431M drives and I was thinking of using one > > drive for squid logs and another for dansguardian logs. I have formatted > > the other drives but I am not sure how to get them in use. What space > > should I give the log files? Thanks in advance. > > In the olden days we'd look to optimise spindles and data paths, and > sometimes even locations on disks for partitions - these days, it seems > that not many people do this. I consider it a dying art myself, but I'm of > the old way of doing things ... > > So if you want performance, you need to look at the ways the drives are > connected. You don't say what they are - SCSI, SATA, IDE, or ... They are scsi drives. > > If they're IDE, then it's best to avoid 2 drives on the same bit of ribbon > cable. Modern controllers will give you a performance gain over older ones > when accessing both drives concurrently, but I have seen one faulty IDE > drive block access to a 2nd on the same ribbon cable. (Drive was fine, > controller board smoked) > > The same is true of SCSI, but to a lesser extent due to the way the bus is > designed, and thet're generally better engineered. > > SATA is less prone to this as you only have one drive per cable (but I've > seen a mobo controller fail, rendering 2 drives unusable )-: > > I doubt the drives are SATA due to their small size though (18G and 35GB) > I'm suspecting they're older SCSI drives as they were popular sizes. > Good guess. > So if they're all on one chain, then look to separate tasks on different > spindles. You'll only get a real advantage if you're using fast SCSI > though. They are on one chain attached to a raid card. > > So 5 drives - OS on one drive, squid cache on another, suqid logs on > another and DG logs on a 4th, leaving the 5th free... > > However you might want to consider RAID or mirroring. If you want speed, > then combine the 2 x 35GB drives via RAID-0, giving you one big 70GB drive > at near double the speed of a single drive. However if one drive fails, > you lose the lot. Maybe not that big a disaster for a squid cache - just > remove the bad drive, re-format the remaining good drive, and start > again... but if you want redundancy, then use RAID-1 which will withstand > a single drive failure - squid data on the RAID drive, OS on one, logs on > the other 2. > > Too many choices though - and without knowing your aims, it's hard to know > what to suggest. > > You also don't say what the Internet b/w is... If it's ADSL or cable, (or > SWGFL) then RAID-0 might be overkill as you'll still be network b/w > bound... If Janet speeds then you might find the server is the bottleneck! > SWGFl is our isp. > Another thing to consider though - power consumption - who's paying the > electric bill for those 5 (old) spinning devices which will run 24x7... > You may well be better off with 2 new "green" drives in the long-run. I > know I was when I had multiple old SCSI spinny things running at home.. > > Anyway - mounting them - just create top-level directories like > > /squid-data > /squid-logs > /dg-logs > Thank you that gave me enough information to google to get started. > and mount the drives there and adjust fstab to mount them at boot time. > > You will need to fiddle with the squid and DG configuration files to place > the data/logs there though. > > Good luck! > > Gordon > > -- > The Mailing List for the Devon & Cornwall LUG > http://mailman.dclug.org.uk/listinfo/list > FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html Windows Live™ SkyDrive™: Get 25 GB of free online storage. Get it on your BlackBerry or iPhone. |
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