Date: Wed, 03 Jul 2013 13:06:29 +0300 From: Alexandr <shuriku@shurik.kiev.ua> To: freebsd-fs@freebsd.org Subject: Re: Whole disk ZFS or -a4k partition Message-ID: <51D3F7A5.5030308@shurik.kiev.ua> In-Reply-To: <C1C8E9F5FF754F50B6FE651728A8A3B5@multiplay.co.uk> References: <51D3ED4F.5030102@shurik.kiev.ua> <C1C8E9F5FF754F50B6FE651728A8A3B5@multiplay.co.uk>
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03.07.2013 12:39, Steven Hartland пишет: > ----- Original Message ----- From: "Alexandr" <shuriku@shurik.kiev.ua> > > >> Hello, community! >> >> I have a laptop with 2 disks - mSATA 32Gb SSD and 500Gb HDD. I plan to >> use SSD as whole disk ZFS pool with root and /usr partitions and 500Gb >> SATA as ZFS pool for /home and /var. My questions are: >> >> 1. Do I need to create a 4k aligned partition on HDD for zfs pool or >> best to use a whole disk? > > As you need a boot partition you will need to 4k align and ensure > the zpool is created with 4k sectors using gnop hack. On ssd I have whole disk zpool and boot sector installed manually with dd: dd if=/boot/zfsboot of=/dev/ada1 count=1 dd if=/boot/zfsboot of=/dev/ada1 skip=1 seek=1024 >> 2. Where the best place for swap - ssd or hdd? SSD is much faster, but >> with limited write life cycle. > > I'd use the ssd for the performance as in general you wont see > significanlty higher wear leveling than general use unless you're really > low on RAM and then you will want it as quick as possible anyway. My laptop has 8Gb DDR3 and core-i5 3210. But when hdd disk io is intensive, laptop becomes very slow and sometimes totally unusable. Using ssd as cache or log device for zpool didn't help and I decide to move system to ssd and leave at hdd only /home and /var partitions. Also I noticed than system becomes slow when using swap. > > If you want ZFS TRIM ensure you use a recent stable/8, stable/9 or head. Yes, I'm using latest 9.1-STABLE #29 r252340M > > Regards > Steve > > ================================================ > This e.mail is private and confidential between Multiplay (UK) Ltd. > and the person or entity to whom it is addressed. In the event of > misdirection, the recipient is prohibited from using, copying, > printing or otherwise disseminating it or any information contained in > it. > In the event of misdirection, illegible or incomplete transmission > please telephone +44 845 868 1337 > or return the E.mail to postmaster@multiplay.co.uk. >
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