Re: [zfs-discuss] deleting a link in ZFS
On 12-08-29 12:29 AM, Gregg Wonderly wrote: On Aug 28, 2012, at 6:01 AM, Murray Cullen themurma...@gmail.com wrote: I've copied an old home directory from an install of OS 134 to the data pool on my OI install. Opensolaris apparently had wine installed as I now have a link to / in my data pool. I've tried everything I can think of to remove this link with one exception. I have not tried mounting the pool on a different OS yet, I'm trying to avoid that. Does anyone have any advice or suggestions? Ulink and rm error out as root. What is the error? Is it permission denied, I/O error, or what? Gregg The error is unlink, not owner although I am the owner. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] deleting a link in ZFS
On 12-08-29 12:29 AM, Gregg Wonderly wrote: On Aug 28, 2012, at 6:01 AM, Murray Cullen themurma...@gmail.com wrote: I've copied an old home directory from an install of OS 134 to the data pool on my OI install. Opensolaris apparently had wine installed as I now have a link to / in my data pool. I've tried eve rything I can think of to remove this link with one exception. I have not tried mounting the pool o n a different OS yet, I'm trying to avoid that. Does anyone have any advice or suggestions? Ulink and rm error out as root. What is the error? Is it permission denied, I/O error, or what? Gregg The error is unlink, not owner although I am the owner. What exactly is the file? In zfs you cannot create a link to a directory; so does the link look like? Casper ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] deleting a link in ZFS
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- boun...@opensolaris.org] On Behalf Of Murray Cullen I've copied an old home directory from an install of OS 134 to the data pool on my OI install. Opensolaris apparently had wine installed as I now have a link to / in my data pool. I've tried everything I can think of to remove this link with one exception. I have not tried mounting the pool on a different OS yet, I'm trying to avoid that. Does anyone have any advice or suggestions? Ulink and rm error out as root. This doesn't sound like a link to me. Can you send us the output? ls -ld /path/to/the_link zfs list | grep whatever_is_relevant zfs get mountpoint the_zfs_filesystem ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] deleting a link in ZFS
On 12-08-29 8:30 AM, Edward Ned Harvey (opensolarisisdeadlongliveopensolaris) wrote: From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- boun...@opensolaris.org] On Behalf Of Murray Cullen I've copied an old home directory from an install of OS 134 to the data pool on my OI install. Opensolaris apparently had wine installed as I now have a link to / in my data pool. I've tried everything I can think of to remove this link with one exception. I have not tried mounting the pool on a different OS yet, I'm trying to avoid that. Does anyone have any advice or suggestions? Ulink and rm error out as root. This doesn't sound like a link to me. Can you send us the output? ls -ld /path/to/the_link zfs list | grep whatever_is_relevant zfs get mountpoint the_zfs_filesystem It now looks like that was a copy of the entire filesystem inside the folder in question, perhaps as a result of copying links off the old drive? Arrgh. Surprising how a night's sleep lets you resolve some issues :) ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] ZFS test suite
Hi, I found a ZFS test suite on the oracle website and found a lot of useful test which I can run for qualification. http://hub.opensolaris.org/bin/view/Community+Group+zfs/zfstestsuite How can I run this test suite on a FreeBSD platform? Any help would be greatly appreciated. Thanks -Anoop ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] ZFS test suite
On 08/29/2012 10:44 AM, anoopn80 wrote: Hi, I found a ZFS test suite on the oracle website and found a lot of useful test which I can run for qualification. http://hub.opensolaris.org/bin/view/Community+Group+zfs/zfstestsuite How can I run this test suite on a FreeBSD platform? I was carried on by Delphix. Please read: http://blog.delphix.com/jkennedy/2012/01/18/resurrecting-the-zfs-test-suite/ Anyway this updated zfstest-suite requires /sbin/zhack. So you should fix it. --- Vitaliy Any help would be greatly appreciated. Thanks -Anoop ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] ZFS snapshot used space question
All, I apologize in advance for what appears to be a question asked quite often, but I am not sure I have ever seen an answer that explains it. This may also be a bit long-winded so I apologize for that as well. I would like to know how much unique space each individual snapshot is using. I have a ZFS filesystem that shows: $zfs list -o space rootpool/export/home NAME AVAIL USED USEDSNAP USEDDS USEDREFRESERV USEDCHILD rootpool/export/home 5.81G 14.4G 8.81G5.54G 0 0 So reading this I see that I have a total of 14.4G of space used by this data set. Currently 5.54 is active data that is available on the normal filesystem and 8.81G used in snapshots. 8.81G + 5.54G = 14.4G (roughly). I 100% agree with these numbers and the world makes sense. This is also backed up by: $zfs get usedbysnapshots rootpool/export/home NAME PROPERTYVALUE SOURCE rootpool/export/home usedbysnapshots 8.81G - Now if I wanted to see how much space any individual snapshot is currently using I would like to think that this would show me: $zfs list -ro space rootpool/export/home NAME AVAIL USED USEDSNAP USEDDS USEDREFRESERV USEDCHILD rootpool/export/home 5.81G 14.4G 8.81G 5.54G 0 0 rootpool/export/home@week3 -202M - - - - rootpool/export/home@week2 -104M - - - - rootpool/export/home@7daysago-1.37M - - - - rootpool/export/home@6daysago-1.20M - - - - rootpool/export/home@5daysago-1020K - - - - rootpool/export/home@4daysago-342K - - - - rootpool/export/home@3daysago-1.28M - - - - rootpool/export/home@week1 -0- - - - rootpool/export/home@2daysago-0- - - - rootpool/export/home@yesterday - 360K - - - - rootpool/export/home@today-1.26M - - - - So normal logic would tell me if USEDSNAP is 8.81G and is composed of 11 snapshots, I would add up the size of each of those snapshots and that would roughly equal 8.81G. So time to break out the calculator: 202M + 104M + 1.37M + 1.20M + 1020K + 342K + 1.28M +0 +0 + 360K + 1.26M equals... ~312M! That is nowhere near 8.81G. I would accept it even if it was within 15%, but it's not even close. That definitely not metadata or ZFS overhead or anything. I understand that snapshots are just the delta between the time when the snapshot was taken and the current active filesystem and are truly just references to a block on disk rather than a copy. I also understand how two (or more) snapshots can reference the same block on a disk but yet there is still only that one block used. If I delete a recent snapshot I may not save as much space as advertised because some may be inherited by a parent snapshot. But that inheritance is not creating duplicate used space on disk so it doesn't justify the huge difference in sizes. But even with this logic in place there is currently 8.81G of blocks referred to by snapshots which are not currently on the active filesystem and I don't believe anyone can argue with that. Can something show me how much space a single snapshot has reserved? I searched through some of the archives and found this thread (http://mail.opensolaris.org/pipermail/zfs-discuss/2012-August/052163.html) from early this month and I feel as if I have the same problem as the OP, but hopefully attacking it with a little more background. I am not arguing with discrepancies between df/du and zfs output and I have read the Oracle documentation about it but haven't found what I feel like should be a simple answer. I currently have a ticket open with Oracle, but I am getting answers to all kinds of questions except for the question I am asking so I am hoping someone out there might be able to help me. I am a little concerned I am going to find out that there is no real way to show it and that makes for one sad SysAdmin. Thanks, Chad ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] ZFS snapshot used space question
As I understand it, the used space of a snapshot does not include anything that is in more than one snapshot. There is a bit of a hack, using the verbose and dry run options of zfs send, that will tell you how much data must be transferred to replicate each snapshot incrementally, which should help clear things up. Try (with elevated privileges): zfs send -nvR rootpool/export/home@today You might also look at the REFER column in zfs list -r -t snapshot rootpool/export/home, which tells you how much data was referenced by the filesystem when the snapshot was taken. However, this could be uninformative if the majority of the snapshot data is rewritten files rather than new files. Tim On Wed, Aug 29, 2012 at 1:12 PM, Truhn, Chad chad.tr...@bowheadsupport.comwrote: All, I apologize in advance for what appears to be a question asked quite often, but I am not sure I have ever seen an answer that explains it. This may also be a bit long-winded so I apologize for that as well. I would like to know how much unique space each individual snapshot is using. I have a ZFS filesystem that shows: $zfs list -o space rootpool/export/home NAME AVAIL USED USEDSNAP USEDDS USEDREFRESERV USEDCHILD rootpool/export/home 5.81G 14.4G 8.81G5.54G 0 0 So reading this I see that I have a total of 14.4G of space used by this data set. Currently 5.54 is active data that is available on the normal filesystem and 8.81G used in snapshots. 8.81G + 5.54G = 14.4G (roughly). I 100% agree with these numbers and the world makes sense. This is also backed up by: $zfs get usedbysnapshots rootpool/export/home NAME PROPERTYVALUE SOURCE rootpool/export/home usedbysnapshots 8.81G - Now if I wanted to see how much space any individual snapshot is currently using I would like to think that this would show me: $zfs list -ro space rootpool/export/home NAME AVAIL USED USEDSNAP USEDDS USEDREFRESERV USEDCHILD rootpool/export/home 5.81G 14.4G 8.81G 5.54G 0 0 rootpool/export/home@week3 -202M - - - - rootpool/export/home@week2 -104M - - - - rootpool/export/home@7daysago-1.37M - - - - rootpool/export/home@6daysago-1.20M - - - - rootpool/export/home@5daysago-1020K - - - - rootpool/export/home@4daysago-342K - - - - rootpool/export/home@3daysago-1.28M - - - - rootpool/export/home@week1 -0- - - - rootpool/export/home@2daysago-0- - - - rootpool/export/home@yesterday - 360K - - - - rootpool/export/home@today-1.26M - - - - So normal logic would tell me if USEDSNAP is 8.81G and is composed of 11 snapshots, I would add up the size of each of those snapshots and that would roughly equal 8.81G. So time to break out the calculator: 202M + 104M + 1.37M + 1.20M + 1020K + 342K + 1.28M +0 +0 + 360K + 1.26M equals... ~312M! That is nowhere near 8.81G. I would accept it even if it was within 15%, but it's not even close. That definitely not metadata or ZFS overhead or anything. I understand that snapshots are just the delta between the time when the snapshot was taken and the current active filesystem and are truly just references to a block on disk rather than a copy. I also understand how two (or more) snapshots can reference the same block on a disk but yet there is still only that one block used. If I delete a recent snapshot I may not save as much space as advertised because some may be inherited by a parent snapshot. But that inheritance is not creating duplicate used space on disk so it doesn't justify the huge difference in sizes. But even with this logic in place there is currently 8.81G of blocks referred to by snapshots which are not currently on the active filesystem and I don't believe anyone can argue with that. Can something show me how much space a single snapshot has reserved? I searched through some of the archives and found this thread ( http://mail.opensolaris.org/pipermail/zfs-discuss/2012-August/052163.html) from early this month and I feel as if I have the same problem as the OP, but hopefully attacking it with a little more background. I am not arguing with discrepancies between df/du and zfs output and I have read the
Re: [zfs-discuss] ZFS snapshot used space question
On Wed, Aug 29, 2012 at 8:58 PM, Timothy Coalson tsc...@mst.edu wrote: As I understand it, the used space of a snapshot does not include anything that is in more than one snapshot. True. It shows the amount that would be freed if you destroyed the snapshot right away. Data held onto by more than one snapshot cannot be removed when you destroy just one of them, obviously. The act of destroying a snapshot will likely change the USED value of the neighbouring snapshots though. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] what have you been buying for slog and l2arc?
On 08/ 4/12 09:50 PM, Eugen Leitl wrote: On Fri, Aug 03, 2012 at 08:39:55PM -0500, Bob Friesenhahn wrote: Extreme write IOPS claims in consumer SSDs are normally based on large write caches which can lose even more data if there is a power failure. Intel 311 with a good UPS would seem to be a reasonable tradeoff. The 313 series looks like a consumer price SLC drive aimed at the recent trend in windows cache drives. Should be worth a look. -- Ian. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
