Re: YASSDQ
Notes: 1. SSDs don't necessarily use 4k blocks, some use larger ones. Starting the All use 4K as it is NTFS default block size and most are sold to be used with windoze. first filesystem partition at 1M works for most of the common values. Alignment of filesystem cannot be better than it's block size. 3. Swap is tricky with small drives, even trickier if you want to use TRIM. Swap files can be used, and then you get TRIM, but see http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/168544 for a way to dismount that swap file before shutdown and an annoying panic. my solution: # cat /etc/rc.local #!/bin/sh echo creating swapfile /bin/rm -f /swapfile.tmp dd if=/dev/zero of=/swapfile.tmp bs=8m seek=1k count=0 /sbin/mdconfig -a -t vnode -u 0 -f /swapfile.tmp || /bin/sh /bin/chflags nodump /swapfile.tmp /bin/rm -f /swapfile.tmp /sbin/swapctl -a /dev/md0 # cat /etc/rc.shutdown.local #!/bin/sh echo removing swapfile /sbin/swapctl -d /dev/md0 /sbin/mdconfig -d -u 0 my partitioning: # disklabel ada0 # /dev/ada0: 8 partitions: # size offsetfstype [fsize bsize bps/cpg] a: 117231408 04.2BSD0 0 0 c: 117231408 0unused0 0 # raw part, don't edit 99% of the time swap is not needed so doesn't take space. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: YASSDQ
On 09/07/2012 11:31, Wojciech Puchar wrote: All use 4K as it is NTFS default block size and most are sold to be used with windoze. Apparently the Intel 320 SSDs use an 8KB page/block size. -- Bruce Cran ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: YASSDQ
On 07/09/12 13:38, Bruce Cran wrote: On 09/07/2012 11:31, Wojciech Puchar wrote: All use 4K as it is NTFS default block size and most are sold to be used with windoze. Apparently the Intel 320 SSDs use an 8KB page/block size. From a Crucial forum, thread about Crucial M4 SSDs, posted by a Crucial employee: [http://forum.crucial.com/t5/Solid-State-Drives-SSD/Page-size-and-erase-block-size-for-M4-64GB-128GB-256GB-models/td-p/64403 about half way down the page] One correction to the information here. The page size is based on the density of the NAND not the process geometry. The 64GB and 128GB m4’s utilize NAND with 4K page sizes and the 256GB and 512GB m4’s utilize NAND with 8K pages. Looks like larger SSDs have larger block sizes. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: YASSDQ
On Mon, 9 Jul 2012, Wojciech Puchar wrote: Notes: 1. SSDs don't necessarily use 4k blocks, some use larger ones. Starting the All use 4K as it is NTFS default block size and most are sold to be used with windoze. No. For example, some of the Crucial M4 drives are 4K, some are 8K. first filesystem partition at 1M works for most of the common values. Alignment of filesystem cannot be better than it's block size. 1M is semi-standard and aligns with all expected block sizes and erase block sizes. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: YASSDQ
From owner-freebsd-questi...@freebsd.org Mon Jul 9 07:40:35 2012 Date: Mon, 09 Jul 2012 13:38:57 +0100 From: Bruce Cran br...@cran.org.uk To: Wojciech Puchar woj...@wojtek.tensor.gdynia.pl Cc: freebsd-questions@freebsd.org, Graham Bentley ad...@cpcnw.co.uk Subject: Re: YASSDQ On 09/07/2012 11:31, Wojciech Puchar wrote: All use 4K as it is NTFS default block size and most are sold to be used with windoze. Apparently the Intel 320 SSDs use an 8KB page/block size. Don't attempt to confuse Wociech with facts. He knows more about everything than anybody. And his opinions are the only correct way to do anything. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
YASSDQ
Hi I have put together a little experimental FreebSD 9.0 box which comprises of ; http://www.cartft.com/catalog/il/934 http://www.overclockers.co.uk/showproduct.php?prodid=HS-023-ZA 2GB RAM and a Sandisk SDSA3BD-054G 8GB SSD The idea is a silent system I can tinker on - nothing serious. I chose the guided install and accepted the default partition / fs layout. I thought the things where running a bit slow and changed from 'native' in the BIOS to 'legacy' SATA and things seem a bit quicker now however I am wondering if I am getting the bext out of the SDD? I have read a little about 'aligning' and 4k sectors I think? If its running ok should I leave as is? Or do you have tunning advice for me? Thanks! ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: YASSDQ
On Sun, 8 Jul 2012, Graham Bentley wrote: Hi I have put together a little experimental FreebSD 9.0 box which comprises of ; http://www.cartft.com/catalog/il/934 http://www.overclockers.co.uk/showproduct.php?prodid=HS-023-ZA 2GB RAM and a Sandisk SDSA3BD-054G 8GB SSD The idea is a silent system I can tinker on - nothing serious. I chose the guided install and accepted the default partition / fs layout. I thought the things where running a bit slow and changed from 'native' in the BIOS to 'legacy' SATA and things seem a bit quicker now however I am wondering if I am getting the bext out of the SDD? I have read a little about 'aligning' and 4k sectors I think? If its running ok should I leave as is? Or do you have tunning advice for me? The default install of 9.0-RELEASE does not align to 4k sectors. Depending on the SSD, this might cost a little or a lot of performance. The example gpart commands I posted in the Format a USB flash drive thread create aligned partitions: http://lists.freebsd.org/pipermail/freebsd-questions/2012-July/243190.html Notes: 1. SSDs don't necessarily use 4k blocks, some use larger ones. Starting the first filesystem partition at 1M works for most of the common values. 2. As Bruce Cran pointed out, TRIM can be enabled with UFS. But make sure the SSD supports it first. 3. Swap is tricky with small drives, even trickier if you want to use TRIM. Swap files can be used, and then you get TRIM, but see http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/168544 for a way to dismount that swap file before shutdown and an annoying panic. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
