Re: ZFS Recovery Tools
What does MAXPHYS mean (yes max raw I/O transfer) and do? A little bit more specific if you may. how large can be single read from disk. when you say read 2 files in the same time, FreeBSD will readahead at most MAXPHYS from one file, then from file 2, from file 1 etc. 128kB/s is way too much for todays drives, that can read 1MB within one access time. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ZFS Recovery Tools
On Fri, Nov 21, 2008 at 10:42 AM, Wojciech Puchar [EMAIL PROTECTED] wrote: What does MAXPHYS mean (yes max raw I/O transfer) and do? A little bit more specific if you may. how large can be single read from disk. when you say read 2 files in the same time, FreeBSD will readahead at most MAXPHYS from one file, then from file 2, from file 1 etc. 128kB/s is way too much for todays drives, that can read 1MB within one access time. Thank you for your explanation. a great day, v ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
RE: ZFS Recovery Tools
What does MAXPHYS mean (yes max raw I/O transfer) and do? A little bit more specific if you may. how large can be single read from disk. when you say read 2 files in the same time, FreeBSD will readahead at most MAXPHYS from one file, then from file 2, from file 1 etc. 128kB/s is way too much for todays drives, that can read 1MB within one access time. 128kB/s is way to much , and you set it to 1024, or did you mean way to low ? Regards, Johan Hendriks No virus found in this outgoing message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.9.4/1795 - Release Date: 17-11-2008 17:24 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ZFS Recovery Tools
Thank you for your explanation. from what i tested 1MB is optimal on modern drives, 2MB doesn't speed up much (if any) but increases latency. use lower values for old drives (20GB) and low memory (=64MB) machines ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
RE: ZFS Recovery Tools
when you say read 2 files in the same time, FreeBSD will readahead at most MAXPHYS from one file, then from file 2, from file 1 etc. 128kB/s is way too much for todays drives, that can read 1MB within one access time. 128kB/s is way to much , and you set it to 1024, or did you mean way to low ? i meant too little. sorry. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ZFS Recovery Tools
all the input from various users I assume zfs would be the file system of choice for such large volumes? Are there limitations or downsides using UFS on such a large volume? no, unless you will create it with default options. use -i big-power-of-two simply to have enough inodes for your files, but not 100 times too much. too much inodes=more wasted space AND VERY SLOW FSCK use -b 32768 or 65536 depending of your file's average size. -b 16384 will work too, but again fsck may be long. of course turn on softupdates. UFS performs excellent on large drives/volumes. not in theory but in practice, i use it every place, on volumes up to 3GB NO PROBLEMS. Also are there any tools for recovery off ZFS volumes? Accidental delete/format/corruption...? no. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ZFS Recovery Tools
On Thu, Nov 20, 2008 at 11:51 AM, Wojciech Puchar [EMAIL PROTECTED] wrote: UFS performs excellent on large drives/volumes. not in theory but in practice, i use it every place, on volumes up to 3GB NO PROBLEMS. Do you mean 3TB instead? yes. sorry ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ZFS Recovery Tools
Hi, I was just reading stuff about ZFS, and wonder if it would be beneficial for me to use it. I store a lots of multimedia files in my HD, they usually have the size of 1GB (e.g. 1.2, 1.7 or even bigger), and my system is running UFS. so can I buy a new HD, say 500GB, and format it ZFS style and use it along with other UFS? and will ZFS performs better than UFS in my situation? Thank you!! TFC On Thu, Nov 20, 2008 at 2:51 PM, Wojciech Puchar [EMAIL PROTECTED] wrote: all the input from various users I assume zfs would be the file system of choice for such large volumes? Are there limitations or downsides using UFS on such a large volume? no, unless you will create it with default options. use -i big-power-of-two simply to have enough inodes for your files, but not 100 times too much. too much inodes=more wasted space AND VERY SLOW FSCK use -b 32768 or 65536 depending of your file's average size. -b 16384 will work too, but again fsck may be long. of course turn on softupdates. UFS performs excellent on large drives/volumes. not in theory but in practice, i use it every place, on volumes up to 3GB NO PROBLEMS. Also are there any tools for recovery off ZFS volumes? Accidental delete/format/corruption...? no. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
RE: ZFS Recovery Tools
Hi, I was just reading stuff about ZFS, and wonder if it would be beneficial for me to use it. I store a lots of multimedia files in my HD, they usually have the size of 1GB (e.g. 1.2, 1.7 or even bigger), and my system is running UFS. so can I buy a new HD, say 500GB, and format it ZFS style and use it along with other UFS? and will ZFS performs better than UFS in my situation? Thank you!! Correct me if im wrong but zfs seems way to experimental and unstable according to what I have found on net so far. FYI - I decided to use UFS in mean while, but for those interested in why I say this... http://wiki.freebsd.org/ZFSKnownProblems I share other NB server roles with my file server and cannot afford lockups etc... Please anyone correct me if im wrong! TFC On Thu, Nov 20, 2008 at 2:51 PM, Wojciech Puchar [EMAIL PROTECTED] wrote: all the input from various users I assume zfs would be the file system of choice for such large volumes? Are there limitations or downsides using UFS on such a large volume? no, unless you will create it with default options. use -i big-power-of-two simply to have enough inodes for your files, but not 100 times too much. too much inodes=more wasted space AND VERY SLOW FSCK use -b 32768 or 65536 depending of your file's average size. -b 16384 will work too, but again fsck may be long. of course turn on softupdates. UFS performs excellent on large drives/volumes. not in theory but in practice, i use it every place, on volumes up to 3GB NO PROBLEMS. Also are there any tools for recovery off ZFS volumes? Accidental delete/format/corruption...? no. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] __ NOD32 3628 (20081120) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ZFS Recovery Tools
On Thu, Nov 20, 2008 at 11:51 AM, Wojciech Puchar [EMAIL PROTECTED] wrote: UFS performs excellent on large drives/volumes. not in theory but in practice, i use it every place, on volumes up to 3GB NO PROBLEMS. Do you mean 3TB instead? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ZFS Recovery Tools
Hi, I was just reading stuff about ZFS, and wonder if it would be beneficial for me to use it. I store a lots of multimedia files in my HD, they usually have the size of 1GB (e.g. 1.2, 1.7 or even bigger), and my system is running UFS. simply use UFS with big blocks (-b 65536 -f 8192) will be OK. BTW i have such change in param.h on every system i have: --- param.h~2008-10-09 20:49:54.0 +0200 +++ param.h 2008-10-09 20:49:54.0 +0200 @@ -121,7 +121,7 @@ #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ #endif #ifndef MAXPHYS -#define MAXPHYS(128 * 1024)/* max raw I/O transfer size */ +#define MAXPHYS(1024 * 1024)/* max raw I/O transfer size */ #endif #ifndef MAXDUMPPGS #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) no idea why it's not the default. so can I buy a new HD, say 500GB, and format it ZFS style and use it along with other UFS? and will ZFS performs better than UFS in my there may be slight (if any) speedup with transfer speed, and HUGE (like 10x) increase in CPU load. on slower CPUs transfers will be actually slower. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ZFS Recovery Tools
On Thu, Nov 20, 2008 at 11:31 PM, Wojciech Puchar [EMAIL PROTECTED] wrote: Hi, I was just reading stuff about ZFS, and wonder if it would be beneficial for me to use it. I store a lots of multimedia files in my HD, they usually have the size of 1GB (e.g. 1.2, 1.7 or even bigger), and my system is running UFS. simply use UFS with big blocks (-b 65536 -f 8192) will be OK. BTW i have such change in param.h on every system i have: --- param.h~2008-10-09 20:49:54.0 +0200 +++ param.h 2008-10-09 20:49:54.0 +0200 @@ -121,7 +121,7 @@ #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ #endif #ifndef MAXPHYS -#define MAXPHYS(128 * 1024)/* max raw I/O transfer size */ +#define MAXPHYS(1024 * 1024)/* max raw I/O transfer size */ What does MAXPHYS mean (yes max raw I/O transfer) and do? A little bit more specific if you may. thank you. #endif #ifndef MAXDUMPPGS #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) no idea why it's not the default. so can I buy a new HD, say 500GB, and format it ZFS style and use it along with other UFS? and will ZFS performs better than UFS in my there may be slight (if any) speedup with transfer speed, and HUGE (like 10x) increase in CPU load. on slower CPUs transfers will be actually slower. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
