| From: | Tomas Vondra <tomas(at)vondra(dot)me> |
|---|---|
| To: | Jakub Wartak <jakub(dot)wartak(at)enterprisedb(dot)com>, Michael Harris <harmic(at)gmail(dot)com> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Subject: | Re: FileFallocate misbehaving on XFS |
| Date: | 2024-12-09 14:47:55 |
| Message-ID: | 499b7e28-3ad4-4088-9c9d-5bf0efde5127@vondra.me |
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| Lists: | pgsql-hackers |
On 12/9/24 11:27, Jakub Wartak wrote:
> On Mon, Dec 9, 2024 at 10:19 AM Michael Harris <harmic(at)gmail(dot)com
> <mailto:harmic(at)gmail(dot)com>> wrote:
>
> Hi Michael,
>
> We found this thread describing similar issues:
>
> https://www.postgresql.org/message-id/flat/
> AS1PR05MB91059AC8B525910A5FCD6E699F9A2%40AS1PR05MB9105.eurprd05.prod.outlook.com <https://www.postgresql.org/message-id/flat/AS1PR05MB91059AC8B525910A5FCD6E699F9A2%40AS1PR05MB9105.eurprd05.prod.outlook.com>
>
>
> We've got some case in the past here in EDB, where an OS vendor has
> blamed XFS AG fragmentation (too many AGs, and if one AG is not having
> enough space -> error). Could You perhaps show us output of on that LUN:
> 1. xfs_info
> 2. run that script from https://www.suse.com/support/kb/doc/?
> id=000018219 <https://www.suse.com/support/kb/doc/?id=000018219> for
> Your AG range
>
But this can be reproduced on a brand new filesystem - I just tried
creating a 1GB image, create XFS on it, mount it, and fallocate a 600MB
file twice. Which that fails, and there can't be any real fragmentation.
regards
--
Tomas Vondra
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